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The benefits of autologous hematopoietic stem cell transplant (AHSCT) for patients with multiple sclerosis (MS) persist for more than 10 years in the majority of patents, new data show. The study reports on 210 Italian patients who underwent AHSCT between 2007 and 2019. Among the entire study cohort, 79.5% of patients had not experienced worsening of disability at 5 years, and 65.5% had not experienced it at 10 years.

Patients with relapsing remitting MS had better results, with 85.5% experiencing no worsening of disability at 5 years, and 71.3% at 10 years. Among patients with progressive MS, 71.0% showed no worsening of disability at 5 years, and 57.2% at 10 years.

“This is the longest follow-up of AHSCT in MS patients so far to be reported,” said study author Matilde Inglese, MD, University of Genoa (Italy). “We have shown AHSCT to be highly effective to prevent long-term disability worsening in most treated patients.”

The study was published online Jan. 20 in Neurology.

“We suggest that AHSCT should be considered as a treatment strategy for MS not responding to conventional therapy,” the authors concluded.

The study had no control group, so a direct comparison is not possible. Nevertheless, Dr. Inglese said she believed these results are better than those that would be achieved with disease-modifying drug therapy for similar patients.

“The best patient candidates for this procedure are those with highly active multiple sclerosis who are not responsive to high-efficacy drugs, such as alemtuzumab or ocrelizumab,” Dr. Inglese commented. “Younger patients with an aggressive form of relapsing remitting MS tend to do the best, although patients with progressive forms of MS who still have active lesions on MRI also benefit.”
 

Renewing the immune system

The transplant procedure involves giving high-dose cyclophosphamide to stimulate mobilization of bone marrow stem cells, which are collected from peripheral blood. Patients then undergo intense immunosuppression with a cocktail of drugs to remove the autoreactive T cells, and the stem cells, which are not autoreactive, are reinfused.

“We are effectively renewing the immune system,” Dr. Inglese said. “While it is not correct to call it a cure, as we are not eliminating the etiology of the disease, it is the closest to complete suppression of the disease that we can get.”

Other results from the study show that among patients with relapsing remitting MS, rates of relapse-free survival were 78.1% at 5 years and 63.5% at 10 years.

Better results were achieved for patients who received the BEAM+ATG conditioning regimen for immunosuppression. That regimen includes carmustine, cytosine-arabinoside, etoposide, and melphalan, followed by rabbit antithymocyte globulin. Among patients with relapsing remitting disease who were treated with this protocol, rates of relapse-free survival were 86.4% at 5 years and 77.0% at 10 years.

For patients with relapsing remitting MS, the probability of achieving NEDA-3 status (no evidence of disease activity, including the absence of clinical relapses, disability worsening, and MRI inflammatory activity) was 62.2% at 5 years and 40.5% at 10 years.

Among those patients with relapsing remitting MS who received the BEAM+ATG conditioning protocol, NEDA-3 status was achieved in 67.7% at 5 years and in 54.9% at 10 years.

Three deaths occurred within 100 days following AHSCT (1.4% of the entire study population). One patient developed pulmonary thromboembolism, received fibrinolytic treatment, and died 48 hours later after intracranial hemorrhage. The second patient experienced engraftment failure and died 24 days after transplant because of an opportunistic infection. The third patient died 1 month after transplant from Wernicke-like encephalopathy. All the patients who died received the BEAM+ATG conditioning regimen. No transplant-related deaths occurred in patients who underwent transplant after 2007.

Dr. Inglese noted that the mortality rate associated with AHSCT has been greatly reduced in recent years. “We are seeing a very low mortality rate – about 0.3% – thanks to improvements in the procedure and better patient selection. This seems acceptable, given that we are treating patients with very aggressive disease who have a high risk of becoming significantly disabled relatively early in life,” she commented.

However, it is vitally important that the procedure be conducted in a specialized center with a highly experienced multidisciplinary team, she stressed.

In the Neurology article, the authors concluded: “Although patients with RRMS [relapsing remitting MS] are those who benefit the most from transplant, AHSCT has been also shown to prevent disability worsening in a large proportion of patients with active progressive MS.

“The BEAM+ATG conditioning protocol, although associated with a higher transplant mortality rate, was associated with a more pronounced suppression of clinical relapses and MRI inflammatory activity, allowing complete disease control in a higher proportion of patients,” they wrote.
 

Potent and durable efficacy, with caveats

Commenting on these latest findings, Jeffrey A. Cohen, MD, of the Mellen Center for Multiple Sclerosis at the Cleveland Clinic, said: “AHSCT appears to have potent and durable efficacy in MS but is associated with significant risk and cost.”

The patients who are most likely to benefit are young and have experienced the onset of disease relatively recently. They are still ambulatory with highly active MS and have experienced recent clinical relapses and/or MRI lesion activity, and such activity continues despite disease-modifying therapy, Dr. Cohen noted. He added that “AHSCT is a reasonable option for such patients who have essentially failed the available disease-modifying therapy options.”

He pointed out that the key question is where AHSCT belongs in the overall MS algorithm relative to other high-efficacy therapies. “We need to know whether it should be used more broadly rather than as a last resort.”

To address that question, several randomized trials comparing AHSCT with high-efficacy disease-modifying therapy are in progress, including the National Institutes of Health–sponsored BEAT-MS trial in the United States (for which Dr. Cohen is the lead investigator) and four European trials – NET-MS (for which Dr. Inglese is the lead investigator), STAR-MS, RAM-MS, and COAST-MS.

The current study was partially funded and supported by the Italian Multiple Sclerosis Foundation. Dr. Inglese disclosed no relevant financial relationships.

A version of this article first appeared on Medscape.com.

The benefits of autologous hematopoietic stem cell transplant (AHSCT) for patients with multiple sclerosis (MS) persist for more than 10 years in the majority of patents, new data show. The study reports on 210 Italian patients who underwent AHSCT between 2007 and 2019. Among the entire study cohort, 79.5% of patients had not experienced worsening of disability at 5 years, and 65.5% had not experienced it at 10 years.

Patients with relapsing remitting MS had better results, with 85.5% experiencing no worsening of disability at 5 years, and 71.3% at 10 years. Among patients with progressive MS, 71.0% showed no worsening of disability at 5 years, and 57.2% at 10 years.

“This is the longest follow-up of AHSCT in MS patients so far to be reported,” said study author Matilde Inglese, MD, University of Genoa (Italy). “We have shown AHSCT to be highly effective to prevent long-term disability worsening in most treated patients.”

The study was published online Jan. 20 in Neurology.

“We suggest that AHSCT should be considered as a treatment strategy for MS not responding to conventional therapy,” the authors concluded.

The study had no control group, so a direct comparison is not possible. Nevertheless, Dr. Inglese said she believed these results are better than those that would be achieved with disease-modifying drug therapy for similar patients.

“The best patient candidates for this procedure are those with highly active multiple sclerosis who are not responsive to high-efficacy drugs, such as alemtuzumab or ocrelizumab,” Dr. Inglese commented. “Younger patients with an aggressive form of relapsing remitting MS tend to do the best, although patients with progressive forms of MS who still have active lesions on MRI also benefit.”
 

Renewing the immune system

The transplant procedure involves giving high-dose cyclophosphamide to stimulate mobilization of bone marrow stem cells, which are collected from peripheral blood. Patients then undergo intense immunosuppression with a cocktail of drugs to remove the autoreactive T cells, and the stem cells, which are not autoreactive, are reinfused.

“We are effectively renewing the immune system,” Dr. Inglese said. “While it is not correct to call it a cure, as we are not eliminating the etiology of the disease, it is the closest to complete suppression of the disease that we can get.”

Other results from the study show that among patients with relapsing remitting MS, rates of relapse-free survival were 78.1% at 5 years and 63.5% at 10 years.

Better results were achieved for patients who received the BEAM+ATG conditioning regimen for immunosuppression. That regimen includes carmustine, cytosine-arabinoside, etoposide, and melphalan, followed by rabbit antithymocyte globulin. Among patients with relapsing remitting disease who were treated with this protocol, rates of relapse-free survival were 86.4% at 5 years and 77.0% at 10 years.

For patients with relapsing remitting MS, the probability of achieving NEDA-3 status (no evidence of disease activity, including the absence of clinical relapses, disability worsening, and MRI inflammatory activity) was 62.2% at 5 years and 40.5% at 10 years.

Among those patients with relapsing remitting MS who received the BEAM+ATG conditioning protocol, NEDA-3 status was achieved in 67.7% at 5 years and in 54.9% at 10 years.

Three deaths occurred within 100 days following AHSCT (1.4% of the entire study population). One patient developed pulmonary thromboembolism, received fibrinolytic treatment, and died 48 hours later after intracranial hemorrhage. The second patient experienced engraftment failure and died 24 days after transplant because of an opportunistic infection. The third patient died 1 month after transplant from Wernicke-like encephalopathy. All the patients who died received the BEAM+ATG conditioning regimen. No transplant-related deaths occurred in patients who underwent transplant after 2007.

Dr. Inglese noted that the mortality rate associated with AHSCT has been greatly reduced in recent years. “We are seeing a very low mortality rate – about 0.3% – thanks to improvements in the procedure and better patient selection. This seems acceptable, given that we are treating patients with very aggressive disease who have a high risk of becoming significantly disabled relatively early in life,” she commented.

However, it is vitally important that the procedure be conducted in a specialized center with a highly experienced multidisciplinary team, she stressed.

In the Neurology article, the authors concluded: “Although patients with RRMS [relapsing remitting MS] are those who benefit the most from transplant, AHSCT has been also shown to prevent disability worsening in a large proportion of patients with active progressive MS.

“The BEAM+ATG conditioning protocol, although associated with a higher transplant mortality rate, was associated with a more pronounced suppression of clinical relapses and MRI inflammatory activity, allowing complete disease control in a higher proportion of patients,” they wrote.
 

Potent and durable efficacy, with caveats

Commenting on these latest findings, Jeffrey A. Cohen, MD, of the Mellen Center for Multiple Sclerosis at the Cleveland Clinic, said: “AHSCT appears to have potent and durable efficacy in MS but is associated with significant risk and cost.”

The patients who are most likely to benefit are young and have experienced the onset of disease relatively recently. They are still ambulatory with highly active MS and have experienced recent clinical relapses and/or MRI lesion activity, and such activity continues despite disease-modifying therapy, Dr. Cohen noted. He added that “AHSCT is a reasonable option for such patients who have essentially failed the available disease-modifying therapy options.”

He pointed out that the key question is where AHSCT belongs in the overall MS algorithm relative to other high-efficacy therapies. “We need to know whether it should be used more broadly rather than as a last resort.”

To address that question, several randomized trials comparing AHSCT with high-efficacy disease-modifying therapy are in progress, including the National Institutes of Health–sponsored BEAT-MS trial in the United States (for which Dr. Cohen is the lead investigator) and four European trials – NET-MS (for which Dr. Inglese is the lead investigator), STAR-MS, RAM-MS, and COAST-MS.

The current study was partially funded and supported by the Italian Multiple Sclerosis Foundation. Dr. Inglese disclosed no relevant financial relationships.

A version of this article first appeared on Medscape.com.

The benefits of autologous hematopoietic stem cell transplant (AHSCT) for patients with multiple sclerosis (MS) persist for more than 10 years in the majority of patents, new data show. The study reports on 210 Italian patients who underwent AHSCT between 2007 and 2019. Among the entire study cohort, 79.5% of patients had not experienced worsening of disability at 5 years, and 65.5% had not experienced it at 10 years.

Patients with relapsing remitting MS had better results, with 85.5% experiencing no worsening of disability at 5 years, and 71.3% at 10 years. Among patients with progressive MS, 71.0% showed no worsening of disability at 5 years, and 57.2% at 10 years.

“This is the longest follow-up of AHSCT in MS patients so far to be reported,” said study author Matilde Inglese, MD, University of Genoa (Italy). “We have shown AHSCT to be highly effective to prevent long-term disability worsening in most treated patients.”

The study was published online Jan. 20 in Neurology.

“We suggest that AHSCT should be considered as a treatment strategy for MS not responding to conventional therapy,” the authors concluded.

The study had no control group, so a direct comparison is not possible. Nevertheless, Dr. Inglese said she believed these results are better than those that would be achieved with disease-modifying drug therapy for similar patients.

“The best patient candidates for this procedure are those with highly active multiple sclerosis who are not responsive to high-efficacy drugs, such as alemtuzumab or ocrelizumab,” Dr. Inglese commented. “Younger patients with an aggressive form of relapsing remitting MS tend to do the best, although patients with progressive forms of MS who still have active lesions on MRI also benefit.”
 

Renewing the immune system

The transplant procedure involves giving high-dose cyclophosphamide to stimulate mobilization of bone marrow stem cells, which are collected from peripheral blood. Patients then undergo intense immunosuppression with a cocktail of drugs to remove the autoreactive T cells, and the stem cells, which are not autoreactive, are reinfused.

“We are effectively renewing the immune system,” Dr. Inglese said. “While it is not correct to call it a cure, as we are not eliminating the etiology of the disease, it is the closest to complete suppression of the disease that we can get.”

Other results from the study show that among patients with relapsing remitting MS, rates of relapse-free survival were 78.1% at 5 years and 63.5% at 10 years.

Better results were achieved for patients who received the BEAM+ATG conditioning regimen for immunosuppression. That regimen includes carmustine, cytosine-arabinoside, etoposide, and melphalan, followed by rabbit antithymocyte globulin. Among patients with relapsing remitting disease who were treated with this protocol, rates of relapse-free survival were 86.4% at 5 years and 77.0% at 10 years.

For patients with relapsing remitting MS, the probability of achieving NEDA-3 status (no evidence of disease activity, including the absence of clinical relapses, disability worsening, and MRI inflammatory activity) was 62.2% at 5 years and 40.5% at 10 years.

Among those patients with relapsing remitting MS who received the BEAM+ATG conditioning protocol, NEDA-3 status was achieved in 67.7% at 5 years and in 54.9% at 10 years.

Three deaths occurred within 100 days following AHSCT (1.4% of the entire study population). One patient developed pulmonary thromboembolism, received fibrinolytic treatment, and died 48 hours later after intracranial hemorrhage. The second patient experienced engraftment failure and died 24 days after transplant because of an opportunistic infection. The third patient died 1 month after transplant from Wernicke-like encephalopathy. All the patients who died received the BEAM+ATG conditioning regimen. No transplant-related deaths occurred in patients who underwent transplant after 2007.

Dr. Inglese noted that the mortality rate associated with AHSCT has been greatly reduced in recent years. “We are seeing a very low mortality rate – about 0.3% – thanks to improvements in the procedure and better patient selection. This seems acceptable, given that we are treating patients with very aggressive disease who have a high risk of becoming significantly disabled relatively early in life,” she commented.

However, it is vitally important that the procedure be conducted in a specialized center with a highly experienced multidisciplinary team, she stressed.

In the Neurology article, the authors concluded: “Although patients with RRMS [relapsing remitting MS] are those who benefit the most from transplant, AHSCT has been also shown to prevent disability worsening in a large proportion of patients with active progressive MS.

“The BEAM+ATG conditioning protocol, although associated with a higher transplant mortality rate, was associated with a more pronounced suppression of clinical relapses and MRI inflammatory activity, allowing complete disease control in a higher proportion of patients,” they wrote.
 

Potent and durable efficacy, with caveats

Commenting on these latest findings, Jeffrey A. Cohen, MD, of the Mellen Center for Multiple Sclerosis at the Cleveland Clinic, said: “AHSCT appears to have potent and durable efficacy in MS but is associated with significant risk and cost.”

The patients who are most likely to benefit are young and have experienced the onset of disease relatively recently. They are still ambulatory with highly active MS and have experienced recent clinical relapses and/or MRI lesion activity, and such activity continues despite disease-modifying therapy, Dr. Cohen noted. He added that “AHSCT is a reasonable option for such patients who have essentially failed the available disease-modifying therapy options.”

He pointed out that the key question is where AHSCT belongs in the overall MS algorithm relative to other high-efficacy therapies. “We need to know whether it should be used more broadly rather than as a last resort.”

To address that question, several randomized trials comparing AHSCT with high-efficacy disease-modifying therapy are in progress, including the National Institutes of Health–sponsored BEAT-MS trial in the United States (for which Dr. Cohen is the lead investigator) and four European trials – NET-MS (for which Dr. Inglese is the lead investigator), STAR-MS, RAM-MS, and COAST-MS.

The current study was partially funded and supported by the Italian Multiple Sclerosis Foundation. Dr. Inglese disclosed no relevant financial relationships.

A version of this article first appeared on Medscape.com.

The combination of liothyronine (LT₃) with levothyroxine (LT₄) for the treatment of hypothyroidism shows no evidence of any increased risk of breast cancer in a large, long-term study, contrary to concerns raised in some prior trials.

“An increasing number of patients ask their physicians for a prescription of combination therapy, often causing tensions. Thus, the question of whether combination therapy does any harm to patients is crucial,” say Tereza Planck, MD, PhD, of Skane University Hospital, Malmo, Sweden, and colleagues, in their article published online Jan. 5 in Thyroid.

“Our data provide reassuring evidence regarding the risk of cancer and mortality,” they stress.

Asked to comment, Caroline T. Nguyen, MD, agrees that the study results are welcome in light of some previous evidence.

“The findings of these [prior] studies were concerning as they suggested an association between T₃ and breast cancer, breast cancer-specific mortality, and poorer prognosis with potential estrogen-like activity of T₃ on the estrogen receptor,” Dr. Nguyen of the division of endocrinology, diabetes & metabolism at Keck Medical Center of University of Southern California, Los Angeles, told this news organization.

“Therefore, the findings of this paper provide some reassurance, which is important because, as the paper states, the use of T₃ is becoming increasingly common.”
 

Many patients with hypothyroidism opt to add liothyronine

Although the standard treatment for hypothyroidism, levothyroxine, increases free thyroxine (T₄) to high-normal levels, it may potentially lower triiodothyronine (T₃) to relatively low levels. There is speculation that the imbalance in a subset of patients could explain why some fail to have an adequate reduction of symptoms with levothyroxine alone.

To offset the effect, some add liothyronine (a synthetic version of T₃) to levothyroxine treatment as so-called “combination therapy.” However, a long-term study conducted in Scotland showed a borderline significant increase in breast cancer risk with the combination, raising concern.

To further investigate, Dr. Planck and coauthors used Swedish adult population data, identifying 575,461 individuals who had made at least three purchases of thyroid hormone therapy between July 2005 and December 2017, and had no history of breast cancer at the time of their first prescription.

Among the individuals, 11,147 had made at least three purchases of LT₃, including combinations with LT₄. LT₄-only users were an average age of 54.4 years, and the average age of those who also took LT₃ was 44.7 years.

Over a median follow-up of 8.1 years, there was no significantly increased risk of breast cancer among women treated with LT₃ plus LT₄ versus LT₄ alone (hazard ratio, 0.93), after adjusting for differences in age, sex, previous thyroid cancer, previous other cancer, use of antithyroid preparations, use of sex hormones, and dose.

Further evaluation of women as well as men showed those treated with LT₃ also had no increased incidence of any cancer (HR, 0.97).

In dose-adjusted models, LT₃ treatment did, surprisingly, appear to have a protective effect in terms of all-cause mortality (HR, 0.69) and any cancer mortality (HR, 0.78) for men and women.

However, the implications of these latter results remain uncertain, first author Dr. Planck said in an interview.

“We think the data on reduced mortality should be interpreted with caution, as we only observe the differences in the models adjusting for dose,” she noted.

 

LT3 treatment still considered ‘experimental’

Despite the dramatic increase in LT₃ prescribing in recent years noted by the authors, as many as five systematic reviews/meta-analyses have shown no superiority of combination therapy over LT₄ alone in terms of hypothyroid symptoms, quality of life, or patient preference.

As a result, many international guidelines still consider the combination-treatment approach to be experimental.

Other trials that have raised concerns about the combination include previous large, prospective Swedish studies that have linked higher endogenous T₃ levels to breast cancer in postmenopausal women.

As for the mechanism, some small experimental studies have suggested an estrogenlike effect whereby T₃ could enhance the proliferation of breast cancer cells.

On a broader level, thyroid hormones, in general, have been extensively studied in cancer research as possibly promoting cancer cell proliferation in a variety of cancer types.

However, the current findings should lay some of those concerns to rest, Dr. Planck reiterated: “Our data provide reassuring evidence regarding the risk of cancer and mortality.”

“We did not identify any increase in breast cancer incidence, any cancer incidence, all-cause mortality, any cancer mortality, or breast cancer mortality between individuals using LT₃ and LT₄ treatment.”

The authors and Nguyen have reported no relevant financial relationships.

A version of this article first appeared on Medscape.com.

The combination of liothyronine (LT₃) with levothyroxine (LT₄) for the treatment of hypothyroidism shows no evidence of any increased risk of breast cancer in a large, long-term study, contrary to concerns raised in some prior trials.

“An increasing number of patients ask their physicians for a prescription of combination therapy, often causing tensions. Thus, the question of whether combination therapy does any harm to patients is crucial,” say Tereza Planck, MD, PhD, of Skane University Hospital, Malmo, Sweden, and colleagues, in their article published online Jan. 5 in Thyroid.

“Our data provide reassuring evidence regarding the risk of cancer and mortality,” they stress.

Asked to comment, Caroline T. Nguyen, MD, agrees that the study results are welcome in light of some previous evidence.

“The findings of these [prior] studies were concerning as they suggested an association between T₃ and breast cancer, breast cancer-specific mortality, and poorer prognosis with potential estrogen-like activity of T₃ on the estrogen receptor,” Dr. Nguyen of the division of endocrinology, diabetes & metabolism at Keck Medical Center of University of Southern California, Los Angeles, told this news organization.

“Therefore, the findings of this paper provide some reassurance, which is important because, as the paper states, the use of T₃ is becoming increasingly common.”
 

Many patients with hypothyroidism opt to add liothyronine

Although the standard treatment for hypothyroidism, levothyroxine, increases free thyroxine (T₄) to high-normal levels, it may potentially lower triiodothyronine (T₃) to relatively low levels. There is speculation that the imbalance in a subset of patients could explain why some fail to have an adequate reduction of symptoms with levothyroxine alone.

To offset the effect, some add liothyronine (a synthetic version of T₃) to levothyroxine treatment as so-called “combination therapy.” However, a long-term study conducted in Scotland showed a borderline significant increase in breast cancer risk with the combination, raising concern.

To further investigate, Dr. Planck and coauthors used Swedish adult population data, identifying 575,461 individuals who had made at least three purchases of thyroid hormone therapy between July 2005 and December 2017, and had no history of breast cancer at the time of their first prescription.

Among the individuals, 11,147 had made at least three purchases of LT₃, including combinations with LT₄. LT₄-only users were an average age of 54.4 years, and the average age of those who also took LT₃ was 44.7 years.

Over a median follow-up of 8.1 years, there was no significantly increased risk of breast cancer among women treated with LT₃ plus LT₄ versus LT₄ alone (hazard ratio, 0.93), after adjusting for differences in age, sex, previous thyroid cancer, previous other cancer, use of antithyroid preparations, use of sex hormones, and dose.

Further evaluation of women as well as men showed those treated with LT₃ also had no increased incidence of any cancer (HR, 0.97).

In dose-adjusted models, LT₃ treatment did, surprisingly, appear to have a protective effect in terms of all-cause mortality (HR, 0.69) and any cancer mortality (HR, 0.78) for men and women.

However, the implications of these latter results remain uncertain, first author Dr. Planck said in an interview.

“We think the data on reduced mortality should be interpreted with caution, as we only observe the differences in the models adjusting for dose,” she noted.

 

LT3 treatment still considered ‘experimental’

Despite the dramatic increase in LT₃ prescribing in recent years noted by the authors, as many as five systematic reviews/meta-analyses have shown no superiority of combination therapy over LT₄ alone in terms of hypothyroid symptoms, quality of life, or patient preference.

As a result, many international guidelines still consider the combination-treatment approach to be experimental.

Other trials that have raised concerns about the combination include previous large, prospective Swedish studies that have linked higher endogenous T₃ levels to breast cancer in postmenopausal women.

As for the mechanism, some small experimental studies have suggested an estrogenlike effect whereby T₃ could enhance the proliferation of breast cancer cells.

On a broader level, thyroid hormones, in general, have been extensively studied in cancer research as possibly promoting cancer cell proliferation in a variety of cancer types.

However, the current findings should lay some of those concerns to rest, Dr. Planck reiterated: “Our data provide reassuring evidence regarding the risk of cancer and mortality.”

“We did not identify any increase in breast cancer incidence, any cancer incidence, all-cause mortality, any cancer mortality, or breast cancer mortality between individuals using LT₃ and LT₄ treatment.”

The authors and Nguyen have reported no relevant financial relationships.

A version of this article first appeared on Medscape.com.

The combination of liothyronine (LT₃) with levothyroxine (LT₄) for the treatment of hypothyroidism shows no evidence of any increased risk of breast cancer in a large, long-term study, contrary to concerns raised in some prior trials.

“An increasing number of patients ask their physicians for a prescription of combination therapy, often causing tensions. Thus, the question of whether combination therapy does any harm to patients is crucial,” say Tereza Planck, MD, PhD, of Skane University Hospital, Malmo, Sweden, and colleagues, in their article published online Jan. 5 in Thyroid.

“Our data provide reassuring evidence regarding the risk of cancer and mortality,” they stress.

Asked to comment, Caroline T. Nguyen, MD, agrees that the study results are welcome in light of some previous evidence.

“The findings of these [prior] studies were concerning as they suggested an association between T₃ and breast cancer, breast cancer-specific mortality, and poorer prognosis with potential estrogen-like activity of T₃ on the estrogen receptor,” Dr. Nguyen of the division of endocrinology, diabetes & metabolism at Keck Medical Center of University of Southern California, Los Angeles, told this news organization.

“Therefore, the findings of this paper provide some reassurance, which is important because, as the paper states, the use of T₃ is becoming increasingly common.”
 

Many patients with hypothyroidism opt to add liothyronine

Although the standard treatment for hypothyroidism, levothyroxine, increases free thyroxine (T₄) to high-normal levels, it may potentially lower triiodothyronine (T₃) to relatively low levels. There is speculation that the imbalance in a subset of patients could explain why some fail to have an adequate reduction of symptoms with levothyroxine alone.

To offset the effect, some add liothyronine (a synthetic version of T₃) to levothyroxine treatment as so-called “combination therapy.” However, a long-term study conducted in Scotland showed a borderline significant increase in breast cancer risk with the combination, raising concern.

To further investigate, Dr. Planck and coauthors used Swedish adult population data, identifying 575,461 individuals who had made at least three purchases of thyroid hormone therapy between July 2005 and December 2017, and had no history of breast cancer at the time of their first prescription.

Among the individuals, 11,147 had made at least three purchases of LT₃, including combinations with LT₄. LT₄-only users were an average age of 54.4 years, and the average age of those who also took LT₃ was 44.7 years.

Over a median follow-up of 8.1 years, there was no significantly increased risk of breast cancer among women treated with LT₃ plus LT₄ versus LT₄ alone (hazard ratio, 0.93), after adjusting for differences in age, sex, previous thyroid cancer, previous other cancer, use of antithyroid preparations, use of sex hormones, and dose.

Further evaluation of women as well as men showed those treated with LT₃ also had no increased incidence of any cancer (HR, 0.97).

In dose-adjusted models, LT₃ treatment did, surprisingly, appear to have a protective effect in terms of all-cause mortality (HR, 0.69) and any cancer mortality (HR, 0.78) for men and women.

However, the implications of these latter results remain uncertain, first author Dr. Planck said in an interview.

“We think the data on reduced mortality should be interpreted with caution, as we only observe the differences in the models adjusting for dose,” she noted.

 

LT3 treatment still considered ‘experimental’

Despite the dramatic increase in LT₃ prescribing in recent years noted by the authors, as many as five systematic reviews/meta-analyses have shown no superiority of combination therapy over LT₄ alone in terms of hypothyroid symptoms, quality of life, or patient preference.

As a result, many international guidelines still consider the combination-treatment approach to be experimental.

Other trials that have raised concerns about the combination include previous large, prospective Swedish studies that have linked higher endogenous T₃ levels to breast cancer in postmenopausal women.

As for the mechanism, some small experimental studies have suggested an estrogenlike effect whereby T₃ could enhance the proliferation of breast cancer cells.

On a broader level, thyroid hormones, in general, have been extensively studied in cancer research as possibly promoting cancer cell proliferation in a variety of cancer types.

However, the current findings should lay some of those concerns to rest, Dr. Planck reiterated: “Our data provide reassuring evidence regarding the risk of cancer and mortality.”

“We did not identify any increase in breast cancer incidence, any cancer incidence, all-cause mortality, any cancer mortality, or breast cancer mortality between individuals using LT₃ and LT₄ treatment.”

The authors and Nguyen have reported no relevant financial relationships.

A version of this article first appeared on Medscape.com.

Plasma levels of phosphorylated tau at threonine 181 (p-tau181) may provide a means of monitoring disease progression for patients with Alzheimer’s disease, new research suggests.

In a study of more than 1,000 participants, changes over time in levels of p-tau181 were associated with prospective neurodegeneration and cognitive decline characteristic of Alzheimer’s disease. These results have implications for investigative trials as well as clinical practice, the investigators noted.

Like p-tau181, neurofilament light chain (NfL) is associated with imaging markers of degeneration and cognitive decline; in contrast to the findings related to p-tau181, however, the associations between NfL and these outcomes are not specific to Alzheimer’s disease. Using both biomarkers could improve prediction of outcomes and patient monitoring, according to the researchers.

“These findings demonstrate that p-tau181 and NfL in blood have individual and complementary potential roles in the diagnosis and the monitoring of neurodegenerative disease,” said coinvestigator Michael Schöll, PhD, senior lecturer in psychiatry and neurochemistry at the University of Gothenburg (Sweden).

“With the reservation that we did not assess domain-specific cognitive impairment, p-tau181 was also more strongly associated with cognitive decline than was NfL,” Dr. Schöll added.

The findings were published online Jan. 11 in JAMA Neurology.
 

Biomarker-tracked neurodegeneration

Monitoring a patient’s neurodegenerative changes is important for tracking Alzheimer’s disease progression. Although clinicians can detect amyloid-beta and tau pathology using PET and cerebrospinal fluid (CSF) biomarkers, the widespread use of the latter has been hampered by cost and limited availability of necessary equipment. The use of blood-based biomarkers is not limited in these ways, and so they could aid in diagnosis and patient monitoring.

Previous studies have suggested that p-tau181 is a marker of Alzheimer’s disease status.

In the current study, investigators examined whether baseline and longitudinal levels of p-tau181 in plasma were associated with progressive neurodegeneration related to the disease. They analyzed data from the Alzheimer’s Disease Neuroimaging Initiative, a multicenter study designed to identify biomarkers for the detection and tracking of Alzheimer’s disease.

The researchers selected data for cognitively unimpaired and cognitively impaired participants who participated in the initiative between Feb. 1, 2007, and June 6, 2016. Participants were eligible for inclusion if plasma p-tau181 and NfL data were available for them and if they had undergone at least one 18fluorodeoxyglucose (FDG)–PET scan or structural T1 MRI at the same study visit. Most had also undergone imaging with 18florbetapir, which detects amyloid-beta.

A single-molecule array was used to analyze concentrations of p-tau181 and NfL in participants’ blood samples. Outliers for p-tau181 and NfL concentrations were excluded from further analysis. Using participants’ FDG-PET scans, the investigators measured glucose hypometabolism characteristic of Alzheimer’s disease. They used T1-weighted MRI scans to measure gray-matter volume.

Cognitively unimpaired participants responded to the Preclinical Alzheimer Cognitive Composite, a measure designed to detect early cognitive changes in cognitively normal patients with Alzheimer’s disease pathology. Cognitively impaired participants underwent the Alzheimer Disease Assessment Scale–Cognitive Subscale with 13 tasks to assess the severity of cognitive impairment.

The researchers included 1,113 participants (54% men; 89% non-Hispanic Whites; mean age, 74 years) in their analysis. In all, 378 participants were cognitively unimpaired, and 735 were cognitively impaired. Of the latter group, 73% had mild cognitive impairment, and 27% had Alzheimer’s disease dementia.
 

Atrophy predictor

Results showed that higher plasma p-tau181 levels at baseline were associated with more rapid progression of hypometabolism and atrophy in areas vulnerable to Alzheimer’s disease among cognitively impaired participants (FDG-PET standardized uptake value ratio change, r = –0.28; P < .001; gray-matter volume change, r = –0.28; P < .001).

The association with atrophy progression in cognitively impaired participants was stronger for p-tau181 than for NfL.

Plasma p-tau181 levels at baseline also predicted atrophy in temporoparietal regions vulnerable to Alzheimer’s disease among cognitively unimpaired participants (r = –0.11; P = .03). NfL, however, was associated with progressive atrophy in frontal regions among cognitively unimpaired participants.

At baseline, plasma p-tau181 levels were associated with prospective cognitive decline in both the cognitively unimpaired group (r = −0.12; P = .04) and the cognitively impaired group (r = 0.35; P < .001). However, plasma NfL was linked to cognitive decline only among those who were cognitively impaired (r = 0.26; P < .001).

Additional analyses showed that p-tau181, unlike NfL, was associated with hypometabolism and atrophy only in participants with amyloid-beta, regardless of cognitive status.

Between 25% and 45% of the association between baseline p-tau181 level and cognitive decline was mediated by baseline imaging markers of neurodegeneration. This finding suggests that another factor, such as regional tau pathology, might have an independent and direct effect on cognition, Dr. Schöll noted.

Furthermore, changes over time in p-tau181 levels were associated with cognitive decline in the cognitively unimpaired (r = –0.24; P < .001) and cognitively impaired (r = 0.34; P < .001) participants. Longitudinal changes in this biomarker also were associated with a prospective decrease in glucose metabolism in cognitively unimpaired (r = –0.05; P = .48) and cognitively impaired (r = –0.27; P < .001) participants, but the association was only significant in the latter group.

Changes over time in p-tau181 levels were linked to prospective decreases in gray-matter volume in brain regions highly characteristic of Alzheimer’s disease in those who were cognitively unimpaired (r = –0.19; P < .001) and those who were cognitively impaired (r = –0.31, P < .001). However, these associations were obtained only in patients with amyloid-beta.

Dr. Schöll noted that blood-based biomarkers that are sensitive to Alzheimer’s disease could greatly expand patients’ access to a diagnostic workup and could improve screening for clinical trials.

“While the final validation of the existence and the monitoring of potential changes of neuropathology in vivo is likely to be conducted using neuroimaging modalities such as PET, our results suggest that at least a part of these examinations could be replaced by regular blood tests,” Dr. Schöll said.

Lead author Alexis Moscoso, PhD, a postdoctoral researcher in psychiatry and neurochemistry at the University of Gothenburg, reported that the researchers will continue validating blood-based biomarkers, especially against established and well-validated neuroimaging methods. “We are also hoping to be able to compare existing and novel blood-based Alzheimer’s disease biomarkers head to head to establish the individual roles each of these play in the research and diagnosis of Alzheimer’s disease,” Dr. Moscoso said.
 

‘Outstanding study’

Commenting on the findings, David S. Knopman, MD, professor of neurology at Mayo Clinic, Rochester, Minn., said that this is “an outstanding study” because of its large number of participants and because the investigators are “world leaders in the technology of measuring plasma p-tau and NfL.”

Dr. Knopman, who was not involved with the research, noted that the study had no substantive weaknesses.

“The biggest advantages of a blood-based biomarker over CSF- and PET-based biomarkers of Alzheimer disease are the obvious ones of accessibility, cost, portability, and ease of repeatability,” he said.

“As CSF and PET exams are largely limited to major medical centers, valid blood-based biomarkers of Alzheimer disease that are reasonably specific make large-scale epidemiological studies that investigate dementia etiologies in rural or urban and diverse communities feasible,” he added.

Whereas p-tau181 appears to be specific for plaque and tangle disease, NfL is a nonspecific marker of neurodegeneration.

“Each has a role that could be valuable, depending on the circumstance,” said Dr. Knopman. “Plasma NfL has already proved itself useful in frontotemporal degeneration and chronic traumatic encephalopathy, for example.”

He noted that future studies should examine how closely p-tau181 and NfL align with more granular and direct measures of Alzheimer’s disease–related brain pathologies.

“There has got to be some loss of fidelity in detecting abnormality in going from brain tissue to blood, which might siphon off some time-related and severity-related information,” said Dr. Knopman.

“The exact role that plasma p-tau and NfL will play remains to be seen, because the diagnostic information that these biomarkers provide is contingent on the existence of interventions that require specific or nonspecific information about progressive neurodegeneration due to Alzheimer disease,” he added.

The study was funded by grants from the Spanish Instituto de Salud Carlos III, the Brightfocus Foundation, the Swedish Alzheimer Foundation, and the Swedish Brain Foundation. Dr. Schöll reported serving on a scientific advisory board for Servier on matters unrelated to this study. Dr. Moscoso and Dr. Knopman have reported no relevant financial relationships.

A version of this article first appeared on Medscape.com.

Plasma levels of phosphorylated tau at threonine 181 (p-tau181) may provide a means of monitoring disease progression for patients with Alzheimer’s disease, new research suggests.

In a study of more than 1,000 participants, changes over time in levels of p-tau181 were associated with prospective neurodegeneration and cognitive decline characteristic of Alzheimer’s disease. These results have implications for investigative trials as well as clinical practice, the investigators noted.

Like p-tau181, neurofilament light chain (NfL) is associated with imaging markers of degeneration and cognitive decline; in contrast to the findings related to p-tau181, however, the associations between NfL and these outcomes are not specific to Alzheimer’s disease. Using both biomarkers could improve prediction of outcomes and patient monitoring, according to the researchers.

“These findings demonstrate that p-tau181 and NfL in blood have individual and complementary potential roles in the diagnosis and the monitoring of neurodegenerative disease,” said coinvestigator Michael Schöll, PhD, senior lecturer in psychiatry and neurochemistry at the University of Gothenburg (Sweden).

“With the reservation that we did not assess domain-specific cognitive impairment, p-tau181 was also more strongly associated with cognitive decline than was NfL,” Dr. Schöll added.

The findings were published online Jan. 11 in JAMA Neurology.
 

Biomarker-tracked neurodegeneration

Monitoring a patient’s neurodegenerative changes is important for tracking Alzheimer’s disease progression. Although clinicians can detect amyloid-beta and tau pathology using PET and cerebrospinal fluid (CSF) biomarkers, the widespread use of the latter has been hampered by cost and limited availability of necessary equipment. The use of blood-based biomarkers is not limited in these ways, and so they could aid in diagnosis and patient monitoring.

Previous studies have suggested that p-tau181 is a marker of Alzheimer’s disease status.

In the current study, investigators examined whether baseline and longitudinal levels of p-tau181 in plasma were associated with progressive neurodegeneration related to the disease. They analyzed data from the Alzheimer’s Disease Neuroimaging Initiative, a multicenter study designed to identify biomarkers for the detection and tracking of Alzheimer’s disease.

The researchers selected data for cognitively unimpaired and cognitively impaired participants who participated in the initiative between Feb. 1, 2007, and June 6, 2016. Participants were eligible for inclusion if plasma p-tau181 and NfL data were available for them and if they had undergone at least one 18fluorodeoxyglucose (FDG)–PET scan or structural T1 MRI at the same study visit. Most had also undergone imaging with 18florbetapir, which detects amyloid-beta.

A single-molecule array was used to analyze concentrations of p-tau181 and NfL in participants’ blood samples. Outliers for p-tau181 and NfL concentrations were excluded from further analysis. Using participants’ FDG-PET scans, the investigators measured glucose hypometabolism characteristic of Alzheimer’s disease. They used T1-weighted MRI scans to measure gray-matter volume.

Cognitively unimpaired participants responded to the Preclinical Alzheimer Cognitive Composite, a measure designed to detect early cognitive changes in cognitively normal patients with Alzheimer’s disease pathology. Cognitively impaired participants underwent the Alzheimer Disease Assessment Scale–Cognitive Subscale with 13 tasks to assess the severity of cognitive impairment.

The researchers included 1,113 participants (54% men; 89% non-Hispanic Whites; mean age, 74 years) in their analysis. In all, 378 participants were cognitively unimpaired, and 735 were cognitively impaired. Of the latter group, 73% had mild cognitive impairment, and 27% had Alzheimer’s disease dementia.
 

Atrophy predictor

Results showed that higher plasma p-tau181 levels at baseline were associated with more rapid progression of hypometabolism and atrophy in areas vulnerable to Alzheimer’s disease among cognitively impaired participants (FDG-PET standardized uptake value ratio change, r = –0.28; P < .001; gray-matter volume change, r = –0.28; P < .001).

The association with atrophy progression in cognitively impaired participants was stronger for p-tau181 than for NfL.

Plasma p-tau181 levels at baseline also predicted atrophy in temporoparietal regions vulnerable to Alzheimer’s disease among cognitively unimpaired participants (r = –0.11; P = .03). NfL, however, was associated with progressive atrophy in frontal regions among cognitively unimpaired participants.

At baseline, plasma p-tau181 levels were associated with prospective cognitive decline in both the cognitively unimpaired group (r = −0.12; P = .04) and the cognitively impaired group (r = 0.35; P < .001). However, plasma NfL was linked to cognitive decline only among those who were cognitively impaired (r = 0.26; P < .001).

Additional analyses showed that p-tau181, unlike NfL, was associated with hypometabolism and atrophy only in participants with amyloid-beta, regardless of cognitive status.

Between 25% and 45% of the association between baseline p-tau181 level and cognitive decline was mediated by baseline imaging markers of neurodegeneration. This finding suggests that another factor, such as regional tau pathology, might have an independent and direct effect on cognition, Dr. Schöll noted.

Furthermore, changes over time in p-tau181 levels were associated with cognitive decline in the cognitively unimpaired (r = –0.24; P < .001) and cognitively impaired (r = 0.34; P < .001) participants. Longitudinal changes in this biomarker also were associated with a prospective decrease in glucose metabolism in cognitively unimpaired (r = –0.05; P = .48) and cognitively impaired (r = –0.27; P < .001) participants, but the association was only significant in the latter group.

Changes over time in p-tau181 levels were linked to prospective decreases in gray-matter volume in brain regions highly characteristic of Alzheimer’s disease in those who were cognitively unimpaired (r = –0.19; P < .001) and those who were cognitively impaired (r = –0.31, P < .001). However, these associations were obtained only in patients with amyloid-beta.

Dr. Schöll noted that blood-based biomarkers that are sensitive to Alzheimer’s disease could greatly expand patients’ access to a diagnostic workup and could improve screening for clinical trials.

“While the final validation of the existence and the monitoring of potential changes of neuropathology in vivo is likely to be conducted using neuroimaging modalities such as PET, our results suggest that at least a part of these examinations could be replaced by regular blood tests,” Dr. Schöll said.

Lead author Alexis Moscoso, PhD, a postdoctoral researcher in psychiatry and neurochemistry at the University of Gothenburg, reported that the researchers will continue validating blood-based biomarkers, especially against established and well-validated neuroimaging methods. “We are also hoping to be able to compare existing and novel blood-based Alzheimer’s disease biomarkers head to head to establish the individual roles each of these play in the research and diagnosis of Alzheimer’s disease,” Dr. Moscoso said.
 

‘Outstanding study’

Commenting on the findings, David S. Knopman, MD, professor of neurology at Mayo Clinic, Rochester, Minn., said that this is “an outstanding study” because of its large number of participants and because the investigators are “world leaders in the technology of measuring plasma p-tau and NfL.”

Dr. Knopman, who was not involved with the research, noted that the study had no substantive weaknesses.

“The biggest advantages of a blood-based biomarker over CSF- and PET-based biomarkers of Alzheimer disease are the obvious ones of accessibility, cost, portability, and ease of repeatability,” he said.

“As CSF and PET exams are largely limited to major medical centers, valid blood-based biomarkers of Alzheimer disease that are reasonably specific make large-scale epidemiological studies that investigate dementia etiologies in rural or urban and diverse communities feasible,” he added.

Whereas p-tau181 appears to be specific for plaque and tangle disease, NfL is a nonspecific marker of neurodegeneration.

“Each has a role that could be valuable, depending on the circumstance,” said Dr. Knopman. “Plasma NfL has already proved itself useful in frontotemporal degeneration and chronic traumatic encephalopathy, for example.”

He noted that future studies should examine how closely p-tau181 and NfL align with more granular and direct measures of Alzheimer’s disease–related brain pathologies.

“There has got to be some loss of fidelity in detecting abnormality in going from brain tissue to blood, which might siphon off some time-related and severity-related information,” said Dr. Knopman.

“The exact role that plasma p-tau and NfL will play remains to be seen, because the diagnostic information that these biomarkers provide is contingent on the existence of interventions that require specific or nonspecific information about progressive neurodegeneration due to Alzheimer disease,” he added.

The study was funded by grants from the Spanish Instituto de Salud Carlos III, the Brightfocus Foundation, the Swedish Alzheimer Foundation, and the Swedish Brain Foundation. Dr. Schöll reported serving on a scientific advisory board for Servier on matters unrelated to this study. Dr. Moscoso and Dr. Knopman have reported no relevant financial relationships.

A version of this article first appeared on Medscape.com.

Plasma levels of phosphorylated tau at threonine 181 (p-tau181) may provide a means of monitoring disease progression for patients with Alzheimer’s disease, new research suggests.

In a study of more than 1,000 participants, changes over time in levels of p-tau181 were associated with prospective neurodegeneration and cognitive decline characteristic of Alzheimer’s disease. These results have implications for investigative trials as well as clinical practice, the investigators noted.

Like p-tau181, neurofilament light chain (NfL) is associated with imaging markers of degeneration and cognitive decline; in contrast to the findings related to p-tau181, however, the associations between NfL and these outcomes are not specific to Alzheimer’s disease. Using both biomarkers could improve prediction of outcomes and patient monitoring, according to the researchers.

“These findings demonstrate that p-tau181 and NfL in blood have individual and complementary potential roles in the diagnosis and the monitoring of neurodegenerative disease,” said coinvestigator Michael Schöll, PhD, senior lecturer in psychiatry and neurochemistry at the University of Gothenburg (Sweden).

“With the reservation that we did not assess domain-specific cognitive impairment, p-tau181 was also more strongly associated with cognitive decline than was NfL,” Dr. Schöll added.

The findings were published online Jan. 11 in JAMA Neurology.
 

Biomarker-tracked neurodegeneration

Monitoring a patient’s neurodegenerative changes is important for tracking Alzheimer’s disease progression. Although clinicians can detect amyloid-beta and tau pathology using PET and cerebrospinal fluid (CSF) biomarkers, the widespread use of the latter has been hampered by cost and limited availability of necessary equipment. The use of blood-based biomarkers is not limited in these ways, and so they could aid in diagnosis and patient monitoring.

Previous studies have suggested that p-tau181 is a marker of Alzheimer’s disease status.

In the current study, investigators examined whether baseline and longitudinal levels of p-tau181 in plasma were associated with progressive neurodegeneration related to the disease. They analyzed data from the Alzheimer’s Disease Neuroimaging Initiative, a multicenter study designed to identify biomarkers for the detection and tracking of Alzheimer’s disease.

The researchers selected data for cognitively unimpaired and cognitively impaired participants who participated in the initiative between Feb. 1, 2007, and June 6, 2016. Participants were eligible for inclusion if plasma p-tau181 and NfL data were available for them and if they had undergone at least one 18fluorodeoxyglucose (FDG)–PET scan or structural T1 MRI at the same study visit. Most had also undergone imaging with 18florbetapir, which detects amyloid-beta.

A single-molecule array was used to analyze concentrations of p-tau181 and NfL in participants’ blood samples. Outliers for p-tau181 and NfL concentrations were excluded from further analysis. Using participants’ FDG-PET scans, the investigators measured glucose hypometabolism characteristic of Alzheimer’s disease. They used T1-weighted MRI scans to measure gray-matter volume.

Cognitively unimpaired participants responded to the Preclinical Alzheimer Cognitive Composite, a measure designed to detect early cognitive changes in cognitively normal patients with Alzheimer’s disease pathology. Cognitively impaired participants underwent the Alzheimer Disease Assessment Scale–Cognitive Subscale with 13 tasks to assess the severity of cognitive impairment.

The researchers included 1,113 participants (54% men; 89% non-Hispanic Whites; mean age, 74 years) in their analysis. In all, 378 participants were cognitively unimpaired, and 735 were cognitively impaired. Of the latter group, 73% had mild cognitive impairment, and 27% had Alzheimer’s disease dementia.
 

Atrophy predictor

Results showed that higher plasma p-tau181 levels at baseline were associated with more rapid progression of hypometabolism and atrophy in areas vulnerable to Alzheimer’s disease among cognitively impaired participants (FDG-PET standardized uptake value ratio change, r = –0.28; P < .001; gray-matter volume change, r = –0.28; P < .001).

The association with atrophy progression in cognitively impaired participants was stronger for p-tau181 than for NfL.

Plasma p-tau181 levels at baseline also predicted atrophy in temporoparietal regions vulnerable to Alzheimer’s disease among cognitively unimpaired participants (r = –0.11; P = .03). NfL, however, was associated with progressive atrophy in frontal regions among cognitively unimpaired participants.

At baseline, plasma p-tau181 levels were associated with prospective cognitive decline in both the cognitively unimpaired group (r = −0.12; P = .04) and the cognitively impaired group (r = 0.35; P < .001). However, plasma NfL was linked to cognitive decline only among those who were cognitively impaired (r = 0.26; P < .001).

Additional analyses showed that p-tau181, unlike NfL, was associated with hypometabolism and atrophy only in participants with amyloid-beta, regardless of cognitive status.

Between 25% and 45% of the association between baseline p-tau181 level and cognitive decline was mediated by baseline imaging markers of neurodegeneration. This finding suggests that another factor, such as regional tau pathology, might have an independent and direct effect on cognition, Dr. Schöll noted.

Furthermore, changes over time in p-tau181 levels were associated with cognitive decline in the cognitively unimpaired (r = –0.24; P < .001) and cognitively impaired (r = 0.34; P < .001) participants. Longitudinal changes in this biomarker also were associated with a prospective decrease in glucose metabolism in cognitively unimpaired (r = –0.05; P = .48) and cognitively impaired (r = –0.27; P < .001) participants, but the association was only significant in the latter group.

Changes over time in p-tau181 levels were linked to prospective decreases in gray-matter volume in brain regions highly characteristic of Alzheimer’s disease in those who were cognitively unimpaired (r = –0.19; P < .001) and those who were cognitively impaired (r = –0.31, P < .001). However, these associations were obtained only in patients with amyloid-beta.

Dr. Schöll noted that blood-based biomarkers that are sensitive to Alzheimer’s disease could greatly expand patients’ access to a diagnostic workup and could improve screening for clinical trials.

“While the final validation of the existence and the monitoring of potential changes of neuropathology in vivo is likely to be conducted using neuroimaging modalities such as PET, our results suggest that at least a part of these examinations could be replaced by regular blood tests,” Dr. Schöll said.

Lead author Alexis Moscoso, PhD, a postdoctoral researcher in psychiatry and neurochemistry at the University of Gothenburg, reported that the researchers will continue validating blood-based biomarkers, especially against established and well-validated neuroimaging methods. “We are also hoping to be able to compare existing and novel blood-based Alzheimer’s disease biomarkers head to head to establish the individual roles each of these play in the research and diagnosis of Alzheimer’s disease,” Dr. Moscoso said.
 

‘Outstanding study’

Commenting on the findings, David S. Knopman, MD, professor of neurology at Mayo Clinic, Rochester, Minn., said that this is “an outstanding study” because of its large number of participants and because the investigators are “world leaders in the technology of measuring plasma p-tau and NfL.”

Dr. Knopman, who was not involved with the research, noted that the study had no substantive weaknesses.

“The biggest advantages of a blood-based biomarker over CSF- and PET-based biomarkers of Alzheimer disease are the obvious ones of accessibility, cost, portability, and ease of repeatability,” he said.

“As CSF and PET exams are largely limited to major medical centers, valid blood-based biomarkers of Alzheimer disease that are reasonably specific make large-scale epidemiological studies that investigate dementia etiologies in rural or urban and diverse communities feasible,” he added.

Whereas p-tau181 appears to be specific for plaque and tangle disease, NfL is a nonspecific marker of neurodegeneration.

“Each has a role that could be valuable, depending on the circumstance,” said Dr. Knopman. “Plasma NfL has already proved itself useful in frontotemporal degeneration and chronic traumatic encephalopathy, for example.”

He noted that future studies should examine how closely p-tau181 and NfL align with more granular and direct measures of Alzheimer’s disease–related brain pathologies.

“There has got to be some loss of fidelity in detecting abnormality in going from brain tissue to blood, which might siphon off some time-related and severity-related information,” said Dr. Knopman.

“The exact role that plasma p-tau and NfL will play remains to be seen, because the diagnostic information that these biomarkers provide is contingent on the existence of interventions that require specific or nonspecific information about progressive neurodegeneration due to Alzheimer disease,” he added.

The study was funded by grants from the Spanish Instituto de Salud Carlos III, the Brightfocus Foundation, the Swedish Alzheimer Foundation, and the Swedish Brain Foundation. Dr. Schöll reported serving on a scientific advisory board for Servier on matters unrelated to this study. Dr. Moscoso and Dr. Knopman have reported no relevant financial relationships.

A version of this article first appeared on Medscape.com.

Patients with a rare type of Alzheimer’s disease do not show the memory loss characteristic of the condition even over the long term, new research suggests. They also show some differences in neuropathology to typical patients with Alzheimer’s disease, raising hopes of discovering novel mechanisms that might protect against memory loss in typical forms of the disease.

“We are discovering that Alzheimer’s disease has more than one form. While the typical patient with Alzheimer’s disease will have impaired memory, patients with primary progressive aphasia linked to Alzheimer’s disease are quite different. They have problems with language – they know what they want to say but can’t find the words – but their memory is intact,” said lead author Marsel Mesulam, MD.

“We have found that these patients still show the same levels of neurofibrillary tangles which destroy neurons in the memory part of the brain as typical patients with Alzheimer’s disease, but in patients with primary progressive aphasia Alzheimer’s the nondominant side of this part of the brain showed less atrophy,” added Dr. Mesulam, who is director of the Mesulam Center for Cognitive Neurology and Alzheimer’s Disease at Northwestern University, Chicago. “It appears that these patients are more resilient to the effects of the neurofibrillary tangles.”

The researchers also found that two biomarkers that are established risk factors in typical Alzheimer’s disease do not appear to be risk factors for the primary progressive aphasia (PPA) form of the condition.

“These observations suggest that there are mechanisms that may protect the brain from Alzheimer’s-type damage. Studying these patients with this primary progressive aphasia form of Alzheimer’s disease may give us clues as to where to look for these mechanisms that may lead to new treatments for the memory loss associated with typical Alzheimer’s disease,” Dr. Mesulam commented.

The study was published online in the Jan. 13 issue of Neurology.

PPA is diagnosed when language impairment emerges on a background of preserved memory and behavior, with about 40% of cases representing atypical manifestations of Alzheimer’s disease, the researchers explained.

“While we knew that the memories of people with primary progressive aphasia were not affected at first, we did not know if they maintained their memory functioning over years,” Dr. Mesulam noted.

The current study aimed to investigate whether the memory preservation in PPA linked to Alzheimer’s disease is a consistent core feature or a transient finding confined to initial presentation, and to explore the underlying pathology of the condition.

The researchers searched their database to identify patients with PPA with autopsy or biomarker evidence of Alzheimer’s disease, who also had at least two consecutive visits during which language and memory assessment had been obtained with the same tests. The study included 17 patients with the PPA-type Alzheimer’s disease who compared with 14 patients who had typical Alzheimer’s disease with memory loss.

The authors pointed out that characterization of memory in patients with PPA is challenging because most tests use word lists, and thus patients may fail the test because of their language impairments. To address this issue, they included patients with PPA who had undergone memory tests involving recalling pictures of common objects.

Patients with typical Alzheimer’s disease underwent similar tests but used a list of common words.

A second round of tests was conducted in the primary progressive aphasia group an average of 2.4 years later and in the typical Alzheimer’s disease group an average of 1.7 years later.

Brain scans were also available for the patients with PPA, as well as postmortem evaluations for eight of the PPA cases and all the typical Alzheimer’s disease cases.

Results showed that patients with PPA had no decline in their memory skills when they took the tests a second time. At that point, they had been showing symptoms of the disorder for an average of 6 years. In contrast, their language skills declined significantly during the same period. For typical patients with Alzheimer’s disease, verbal memory and language skills declined with equal severity during the study.

Postmortem results showed that the two groups had comparable degrees of Alzheimer’s disease pathology in the medial temporal lobe – the main area of the brain affected in dementia.

However, MRI scans showed that patients with PPA had an asymmetrical atrophy of the dominant (left) hemisphere with sparing of the right sided medial temporal lobe, indicating a lack of neurodegeneration in the nondominant hemisphere, despite the presence of Alzheimer’s disease pathology.

It was also found that the patients with PPA had significantly lower prevalence of two factors strongly linked to Alzheimer’s disease – TDP-43 pathology and APOE ε4 positivity – than the typical patients with Alzheimer’s disease.

The authors concluded that “primary progressive aphasia Alzheimer’s syndrome offers unique opportunities for exploring the biological foundations of these phenomena that interactively modulate the impact of Alzheimer’s disease neuropathology on cognitive function.”
 

‘Preservation of cognition is the holy grail’

In an accompanying editorial, Seyed Ahmad Sajjadi, MD, University of California, Irvine; Sharon Ash, PhD, University of Pennsylvania, Philadelphia; and Stefano Cappa, MD, University School for Advanced Studies, Pavia, Italy, said these findings have important implications, “as ultimately, preservation of cognition is the holy grail of research in this area.”

They pointed out that the current observations imply “an uncoupling of neurodegeneration and pathology” in patients with PPA-type Alzheimer’s disease, adding that “it seems reasonable to conclude that neurodegeneration, and not mere presence of pathology, is what correlates with clinical presentation in these patients.”

The editorialists noted that the study has some limitations: the sample size is relatively small, not all patients with PPA-type Alzheimer’s disease underwent autopsy, MRI was only available for the aphasia group, and the two groups had different memory tests for comparison of their recognition memory.

But they concluded that this study “provides important insights about the potential reasons for differential vulnerability of the neural substrate of memory in those with different clinical presentations of Alzheimer’s disease pathology.”

The study was supported by the National Institute on Deafness and Communication Disorders, the National Institute of Neurological Disorders and Stroke, the National Institute on Aging, the Davee Foundation, and the Jeanine Jones Fund.

A version of this article first appeared on Medscape.com.

Patients with a rare type of Alzheimer’s disease do not show the memory loss characteristic of the condition even over the long term, new research suggests. They also show some differences in neuropathology to typical patients with Alzheimer’s disease, raising hopes of discovering novel mechanisms that might protect against memory loss in typical forms of the disease.

“We are discovering that Alzheimer’s disease has more than one form. While the typical patient with Alzheimer’s disease will have impaired memory, patients with primary progressive aphasia linked to Alzheimer’s disease are quite different. They have problems with language – they know what they want to say but can’t find the words – but their memory is intact,” said lead author Marsel Mesulam, MD.

“We have found that these patients still show the same levels of neurofibrillary tangles which destroy neurons in the memory part of the brain as typical patients with Alzheimer’s disease, but in patients with primary progressive aphasia Alzheimer’s the nondominant side of this part of the brain showed less atrophy,” added Dr. Mesulam, who is director of the Mesulam Center for Cognitive Neurology and Alzheimer’s Disease at Northwestern University, Chicago. “It appears that these patients are more resilient to the effects of the neurofibrillary tangles.”

The researchers also found that two biomarkers that are established risk factors in typical Alzheimer’s disease do not appear to be risk factors for the primary progressive aphasia (PPA) form of the condition.

“These observations suggest that there are mechanisms that may protect the brain from Alzheimer’s-type damage. Studying these patients with this primary progressive aphasia form of Alzheimer’s disease may give us clues as to where to look for these mechanisms that may lead to new treatments for the memory loss associated with typical Alzheimer’s disease,” Dr. Mesulam commented.

The study was published online in the Jan. 13 issue of Neurology.

PPA is diagnosed when language impairment emerges on a background of preserved memory and behavior, with about 40% of cases representing atypical manifestations of Alzheimer’s disease, the researchers explained.

“While we knew that the memories of people with primary progressive aphasia were not affected at first, we did not know if they maintained their memory functioning over years,” Dr. Mesulam noted.

The current study aimed to investigate whether the memory preservation in PPA linked to Alzheimer’s disease is a consistent core feature or a transient finding confined to initial presentation, and to explore the underlying pathology of the condition.

The researchers searched their database to identify patients with PPA with autopsy or biomarker evidence of Alzheimer’s disease, who also had at least two consecutive visits during which language and memory assessment had been obtained with the same tests. The study included 17 patients with the PPA-type Alzheimer’s disease who compared with 14 patients who had typical Alzheimer’s disease with memory loss.

The authors pointed out that characterization of memory in patients with PPA is challenging because most tests use word lists, and thus patients may fail the test because of their language impairments. To address this issue, they included patients with PPA who had undergone memory tests involving recalling pictures of common objects.

Patients with typical Alzheimer’s disease underwent similar tests but used a list of common words.

A second round of tests was conducted in the primary progressive aphasia group an average of 2.4 years later and in the typical Alzheimer’s disease group an average of 1.7 years later.

Brain scans were also available for the patients with PPA, as well as postmortem evaluations for eight of the PPA cases and all the typical Alzheimer’s disease cases.

Results showed that patients with PPA had no decline in their memory skills when they took the tests a second time. At that point, they had been showing symptoms of the disorder for an average of 6 years. In contrast, their language skills declined significantly during the same period. For typical patients with Alzheimer’s disease, verbal memory and language skills declined with equal severity during the study.

Postmortem results showed that the two groups had comparable degrees of Alzheimer’s disease pathology in the medial temporal lobe – the main area of the brain affected in dementia.

However, MRI scans showed that patients with PPA had an asymmetrical atrophy of the dominant (left) hemisphere with sparing of the right sided medial temporal lobe, indicating a lack of neurodegeneration in the nondominant hemisphere, despite the presence of Alzheimer’s disease pathology.

It was also found that the patients with PPA had significantly lower prevalence of two factors strongly linked to Alzheimer’s disease – TDP-43 pathology and APOE ε4 positivity – than the typical patients with Alzheimer’s disease.

The authors concluded that “primary progressive aphasia Alzheimer’s syndrome offers unique opportunities for exploring the biological foundations of these phenomena that interactively modulate the impact of Alzheimer’s disease neuropathology on cognitive function.”
 

‘Preservation of cognition is the holy grail’

In an accompanying editorial, Seyed Ahmad Sajjadi, MD, University of California, Irvine; Sharon Ash, PhD, University of Pennsylvania, Philadelphia; and Stefano Cappa, MD, University School for Advanced Studies, Pavia, Italy, said these findings have important implications, “as ultimately, preservation of cognition is the holy grail of research in this area.”

They pointed out that the current observations imply “an uncoupling of neurodegeneration and pathology” in patients with PPA-type Alzheimer’s disease, adding that “it seems reasonable to conclude that neurodegeneration, and not mere presence of pathology, is what correlates with clinical presentation in these patients.”

The editorialists noted that the study has some limitations: the sample size is relatively small, not all patients with PPA-type Alzheimer’s disease underwent autopsy, MRI was only available for the aphasia group, and the two groups had different memory tests for comparison of their recognition memory.

But they concluded that this study “provides important insights about the potential reasons for differential vulnerability of the neural substrate of memory in those with different clinical presentations of Alzheimer’s disease pathology.”

The study was supported by the National Institute on Deafness and Communication Disorders, the National Institute of Neurological Disorders and Stroke, the National Institute on Aging, the Davee Foundation, and the Jeanine Jones Fund.

A version of this article first appeared on Medscape.com.

Patients with a rare type of Alzheimer’s disease do not show the memory loss characteristic of the condition even over the long term, new research suggests. They also show some differences in neuropathology to typical patients with Alzheimer’s disease, raising hopes of discovering novel mechanisms that might protect against memory loss in typical forms of the disease.

“We are discovering that Alzheimer’s disease has more than one form. While the typical patient with Alzheimer’s disease will have impaired memory, patients with primary progressive aphasia linked to Alzheimer’s disease are quite different. They have problems with language – they know what they want to say but can’t find the words – but their memory is intact,” said lead author Marsel Mesulam, MD.

“We have found that these patients still show the same levels of neurofibrillary tangles which destroy neurons in the memory part of the brain as typical patients with Alzheimer’s disease, but in patients with primary progressive aphasia Alzheimer’s the nondominant side of this part of the brain showed less atrophy,” added Dr. Mesulam, who is director of the Mesulam Center for Cognitive Neurology and Alzheimer’s Disease at Northwestern University, Chicago. “It appears that these patients are more resilient to the effects of the neurofibrillary tangles.”

The researchers also found that two biomarkers that are established risk factors in typical Alzheimer’s disease do not appear to be risk factors for the primary progressive aphasia (PPA) form of the condition.

“These observations suggest that there are mechanisms that may protect the brain from Alzheimer’s-type damage. Studying these patients with this primary progressive aphasia form of Alzheimer’s disease may give us clues as to where to look for these mechanisms that may lead to new treatments for the memory loss associated with typical Alzheimer’s disease,” Dr. Mesulam commented.

The study was published online in the Jan. 13 issue of Neurology.

PPA is diagnosed when language impairment emerges on a background of preserved memory and behavior, with about 40% of cases representing atypical manifestations of Alzheimer’s disease, the researchers explained.

“While we knew that the memories of people with primary progressive aphasia were not affected at first, we did not know if they maintained their memory functioning over years,” Dr. Mesulam noted.

The current study aimed to investigate whether the memory preservation in PPA linked to Alzheimer’s disease is a consistent core feature or a transient finding confined to initial presentation, and to explore the underlying pathology of the condition.

The researchers searched their database to identify patients with PPA with autopsy or biomarker evidence of Alzheimer’s disease, who also had at least two consecutive visits during which language and memory assessment had been obtained with the same tests. The study included 17 patients with the PPA-type Alzheimer’s disease who compared with 14 patients who had typical Alzheimer’s disease with memory loss.

The authors pointed out that characterization of memory in patients with PPA is challenging because most tests use word lists, and thus patients may fail the test because of their language impairments. To address this issue, they included patients with PPA who had undergone memory tests involving recalling pictures of common objects.

Patients with typical Alzheimer’s disease underwent similar tests but used a list of common words.

A second round of tests was conducted in the primary progressive aphasia group an average of 2.4 years later and in the typical Alzheimer’s disease group an average of 1.7 years later.

Brain scans were also available for the patients with PPA, as well as postmortem evaluations for eight of the PPA cases and all the typical Alzheimer’s disease cases.

Results showed that patients with PPA had no decline in their memory skills when they took the tests a second time. At that point, they had been showing symptoms of the disorder for an average of 6 years. In contrast, their language skills declined significantly during the same period. For typical patients with Alzheimer’s disease, verbal memory and language skills declined with equal severity during the study.

Postmortem results showed that the two groups had comparable degrees of Alzheimer’s disease pathology in the medial temporal lobe – the main area of the brain affected in dementia.

However, MRI scans showed that patients with PPA had an asymmetrical atrophy of the dominant (left) hemisphere with sparing of the right sided medial temporal lobe, indicating a lack of neurodegeneration in the nondominant hemisphere, despite the presence of Alzheimer’s disease pathology.

It was also found that the patients with PPA had significantly lower prevalence of two factors strongly linked to Alzheimer’s disease – TDP-43 pathology and APOE ε4 positivity – than the typical patients with Alzheimer’s disease.

The authors concluded that “primary progressive aphasia Alzheimer’s syndrome offers unique opportunities for exploring the biological foundations of these phenomena that interactively modulate the impact of Alzheimer’s disease neuropathology on cognitive function.”
 

‘Preservation of cognition is the holy grail’

In an accompanying editorial, Seyed Ahmad Sajjadi, MD, University of California, Irvine; Sharon Ash, PhD, University of Pennsylvania, Philadelphia; and Stefano Cappa, MD, University School for Advanced Studies, Pavia, Italy, said these findings have important implications, “as ultimately, preservation of cognition is the holy grail of research in this area.”

They pointed out that the current observations imply “an uncoupling of neurodegeneration and pathology” in patients with PPA-type Alzheimer’s disease, adding that “it seems reasonable to conclude that neurodegeneration, and not mere presence of pathology, is what correlates with clinical presentation in these patients.”

The editorialists noted that the study has some limitations: the sample size is relatively small, not all patients with PPA-type Alzheimer’s disease underwent autopsy, MRI was only available for the aphasia group, and the two groups had different memory tests for comparison of their recognition memory.

But they concluded that this study “provides important insights about the potential reasons for differential vulnerability of the neural substrate of memory in those with different clinical presentations of Alzheimer’s disease pathology.”

The study was supported by the National Institute on Deafness and Communication Disorders, the National Institute of Neurological Disorders and Stroke, the National Institute on Aging, the Davee Foundation, and the Jeanine Jones Fund.

A version of this article first appeared on Medscape.com.

A new tool for predicting the risk of severe chemotherapy toxicity in older adults with early-stage breast cancer outperforms existing models and should help older patients and physicians make treatment decisions with more confidence, according to investigators.

They devised and tested the tool, called the Cancer and Aging Research Group–Breast Cancer (CARG-BC) score, in two cohorts of patients aged 65 years or older with stage I-III breast cancer.

The area under the curve for predicting grade 3-5 toxicity was 0.75 in the development cohort and 0.69 in the validation cohort, for a combined AUC of 0.73.

The CARG-BC score outperformed both Karnofsky performance status (AUC, 0.50) and the Cancer and Aging Research Group Chemotherapy Toxicity Tool (AUC, 0.56).

CARG-BC risk groups were also associated with hospitalizations, dose modifications, and early termination of treatment.

Allison Magnuson, DO, of the University of Rochester (N.Y.), and colleagues described these results in the Journal of Clinical Oncology.
 

About CARG-BC

To calculate a patient’s CARG-BC score, the researchers added up points assigned to eight independent predictors of grade 3-5 chemotherapy toxicity:

• Planned anthracycline use (1 point)
• Stage II or III disease (3 points)
• Planned treatment duration longer than 3 months (4 points)
• Abnormal liver function (3 points)
• Low hemoglobin level (3 points)
• A fall in the previous 6 months (4 points)
• Limited ability to walk more than 1 mile (3 points)
• Lack of social support (3 points)

Patients with scores of 0-5 have a low risk, those with scores of 6-11 have an intermediate risk, and those with scores of 12 or above have a high risk of grade 3-5 toxicity.
 

Patient characteristics and results

There were 283 patients in the development cohort and 190 in the validation cohort. There were no significant demographic, disease, or treatment differences between the cohorts.

All patients had a mean age of 70.5 years, 36.2% had stage I disease, 42.9% had stage II, and 20.9% had stage III disease. Three-quarters of patients were non-Hispanic White, and 99.4% were women. Roughly a third of patients had received an anthracycline-based regimen.

Overall, about a quarter of patients had an unplanned dose reduction (24%), dose delay (26%), stopped treatment early (24%), or were hospitalized during treatment (23%). All of these occurrences were more likely in intermediate- and high-risk patients versus low-risk patients (P < .001).

In the development cohort, 19% of low-risk patients, 54% of intermediate-risk patients, and 87% of high-risk patients developed grade 3-5 chemotherapy toxicity.

Compared with the 93 patients in the low-risk group, the odds of toxicity was almost 5 times greater for the 159 intermediate-risk subjects, and 28 times greater for the 30 high-risk subjects.

In the validation cohort, grade 3-5 toxicity rates were 27% in the low-risk group, 45% in the intermediate-risk group, and 76% in the high-risk group.

This study had its limitations, including that a majority of subjects (72.2%) had a college education, and the validation cohort was accrued from the same 16 institutions as the development cohort.

“Further validation in a more diverse population should be considered,” the investigators wrote.
 

A ‘useful’ tool for guiding therapy

The investigators noted that chemotherapy is a complex decision for older adults with stage I-III breast cancer. While it may be indicated, chemotherapy is underused often because of the higher risk of severe toxicity in older people.

“Unfortunately, older adults aged 65 and over, who comprise about half of all breast cancer diagnoses, are significantly less likely to be offered chemotherapy compared to younger patients – sometimes because their doctors fear they won’t be able to tolerate it,” investigator Mina Sedrak, MD, of City of Hope National Medical Center in Duarte, Calif., said in a press release.

The CARG-BC score may be useful to direct therapy in older adults with early-stage breast cancer, the investigators wrote. They noted that intensifying supportive care and developing modified treatment regimens may be appropriate for patients at higher risk for toxicity.

“Although this score should not be used as the only factor in deciding whether to administer and/or alter the dose or schedule of chemotherapy, the CARG-BC score can be used to facilitate this complex decision-making process, along with clinical judgment and patient preferences,” they wrote.

“I think this is a great tool. [It] will be helpful to me to have a more accurate conversation with geriatric patients about the actual risk/benefit ratio for chemotherapy in early breast cancer,” said Amy Tiersten, MD, of Mount Sinai Hospital in New York, when asked for comment.

“If routinely implemented, it may help reduce age bias and also identify older patients who may look well but may be vulnerable and quickly decompensate while undergoing treatment,” said Lidia Schapira, MD, of Stanford (Calif.) University. “Importantly, it can be used to guide conversations about trade-offs and to start a frank conversation about an older patient’s fears and concerns about treatment.”

This research was funded by the National Institute on Aging, the Breast Cancer Research Foundation, and the Center for Cancer and Aging at City of Hope. The investigators, Dr. Schapira, and Dr. Tiersten had no relevant disclosures.

[email protected]

A new tool for predicting the risk of severe chemotherapy toxicity in older adults with early-stage breast cancer outperforms existing models and should help older patients and physicians make treatment decisions with more confidence, according to investigators.

They devised and tested the tool, called the Cancer and Aging Research Group–Breast Cancer (CARG-BC) score, in two cohorts of patients aged 65 years or older with stage I-III breast cancer.

The area under the curve for predicting grade 3-5 toxicity was 0.75 in the development cohort and 0.69 in the validation cohort, for a combined AUC of 0.73.

The CARG-BC score outperformed both Karnofsky performance status (AUC, 0.50) and the Cancer and Aging Research Group Chemotherapy Toxicity Tool (AUC, 0.56).

CARG-BC risk groups were also associated with hospitalizations, dose modifications, and early termination of treatment.

Allison Magnuson, DO, of the University of Rochester (N.Y.), and colleagues described these results in the Journal of Clinical Oncology.
 

About CARG-BC

To calculate a patient’s CARG-BC score, the researchers added up points assigned to eight independent predictors of grade 3-5 chemotherapy toxicity:

• Planned anthracycline use (1 point)
• Stage II or III disease (3 points)
• Planned treatment duration longer than 3 months (4 points)
• Abnormal liver function (3 points)
• Low hemoglobin level (3 points)
• A fall in the previous 6 months (4 points)
• Limited ability to walk more than 1 mile (3 points)
• Lack of social support (3 points)

Patients with scores of 0-5 have a low risk, those with scores of 6-11 have an intermediate risk, and those with scores of 12 or above have a high risk of grade 3-5 toxicity.
 

Patient characteristics and results

There were 283 patients in the development cohort and 190 in the validation cohort. There were no significant demographic, disease, or treatment differences between the cohorts.

All patients had a mean age of 70.5 years, 36.2% had stage I disease, 42.9% had stage II, and 20.9% had stage III disease. Three-quarters of patients were non-Hispanic White, and 99.4% were women. Roughly a third of patients had received an anthracycline-based regimen.

Overall, about a quarter of patients had an unplanned dose reduction (24%), dose delay (26%), stopped treatment early (24%), or were hospitalized during treatment (23%). All of these occurrences were more likely in intermediate- and high-risk patients versus low-risk patients (P < .001).

In the development cohort, 19% of low-risk patients, 54% of intermediate-risk patients, and 87% of high-risk patients developed grade 3-5 chemotherapy toxicity.

Compared with the 93 patients in the low-risk group, the odds of toxicity was almost 5 times greater for the 159 intermediate-risk subjects, and 28 times greater for the 30 high-risk subjects.

In the validation cohort, grade 3-5 toxicity rates were 27% in the low-risk group, 45% in the intermediate-risk group, and 76% in the high-risk group.

This study had its limitations, including that a majority of subjects (72.2%) had a college education, and the validation cohort was accrued from the same 16 institutions as the development cohort.

“Further validation in a more diverse population should be considered,” the investigators wrote.
 

A ‘useful’ tool for guiding therapy

The investigators noted that chemotherapy is a complex decision for older adults with stage I-III breast cancer. While it may be indicated, chemotherapy is underused often because of the higher risk of severe toxicity in older people.

“Unfortunately, older adults aged 65 and over, who comprise about half of all breast cancer diagnoses, are significantly less likely to be offered chemotherapy compared to younger patients – sometimes because their doctors fear they won’t be able to tolerate it,” investigator Mina Sedrak, MD, of City of Hope National Medical Center in Duarte, Calif., said in a press release.

The CARG-BC score may be useful to direct therapy in older adults with early-stage breast cancer, the investigators wrote. They noted that intensifying supportive care and developing modified treatment regimens may be appropriate for patients at higher risk for toxicity.

“Although this score should not be used as the only factor in deciding whether to administer and/or alter the dose or schedule of chemotherapy, the CARG-BC score can be used to facilitate this complex decision-making process, along with clinical judgment and patient preferences,” they wrote.

“I think this is a great tool. [It] will be helpful to me to have a more accurate conversation with geriatric patients about the actual risk/benefit ratio for chemotherapy in early breast cancer,” said Amy Tiersten, MD, of Mount Sinai Hospital in New York, when asked for comment.

“If routinely implemented, it may help reduce age bias and also identify older patients who may look well but may be vulnerable and quickly decompensate while undergoing treatment,” said Lidia Schapira, MD, of Stanford (Calif.) University. “Importantly, it can be used to guide conversations about trade-offs and to start a frank conversation about an older patient’s fears and concerns about treatment.”

This research was funded by the National Institute on Aging, the Breast Cancer Research Foundation, and the Center for Cancer and Aging at City of Hope. The investigators, Dr. Schapira, and Dr. Tiersten had no relevant disclosures.

[email protected]

A new tool for predicting the risk of severe chemotherapy toxicity in older adults with early-stage breast cancer outperforms existing models and should help older patients and physicians make treatment decisions with more confidence, according to investigators.

They devised and tested the tool, called the Cancer and Aging Research Group–Breast Cancer (CARG-BC) score, in two cohorts of patients aged 65 years or older with stage I-III breast cancer.

The area under the curve for predicting grade 3-5 toxicity was 0.75 in the development cohort and 0.69 in the validation cohort, for a combined AUC of 0.73.

The CARG-BC score outperformed both Karnofsky performance status (AUC, 0.50) and the Cancer and Aging Research Group Chemotherapy Toxicity Tool (AUC, 0.56).

CARG-BC risk groups were also associated with hospitalizations, dose modifications, and early termination of treatment.

Allison Magnuson, DO, of the University of Rochester (N.Y.), and colleagues described these results in the Journal of Clinical Oncology.
 

About CARG-BC

To calculate a patient’s CARG-BC score, the researchers added up points assigned to eight independent predictors of grade 3-5 chemotherapy toxicity:

• Planned anthracycline use (1 point)
• Stage II or III disease (3 points)
• Planned treatment duration longer than 3 months (4 points)
• Abnormal liver function (3 points)
• Low hemoglobin level (3 points)
• A fall in the previous 6 months (4 points)
• Limited ability to walk more than 1 mile (3 points)
• Lack of social support (3 points)

Patients with scores of 0-5 have a low risk, those with scores of 6-11 have an intermediate risk, and those with scores of 12 or above have a high risk of grade 3-5 toxicity.
 

Patient characteristics and results

There were 283 patients in the development cohort and 190 in the validation cohort. There were no significant demographic, disease, or treatment differences between the cohorts.

All patients had a mean age of 70.5 years, 36.2% had stage I disease, 42.9% had stage II, and 20.9% had stage III disease. Three-quarters of patients were non-Hispanic White, and 99.4% were women. Roughly a third of patients had received an anthracycline-based regimen.

Overall, about a quarter of patients had an unplanned dose reduction (24%), dose delay (26%), stopped treatment early (24%), or were hospitalized during treatment (23%). All of these occurrences were more likely in intermediate- and high-risk patients versus low-risk patients (P < .001).

In the development cohort, 19% of low-risk patients, 54% of intermediate-risk patients, and 87% of high-risk patients developed grade 3-5 chemotherapy toxicity.

Compared with the 93 patients in the low-risk group, the odds of toxicity was almost 5 times greater for the 159 intermediate-risk subjects, and 28 times greater for the 30 high-risk subjects.

In the validation cohort, grade 3-5 toxicity rates were 27% in the low-risk group, 45% in the intermediate-risk group, and 76% in the high-risk group.

This study had its limitations, including that a majority of subjects (72.2%) had a college education, and the validation cohort was accrued from the same 16 institutions as the development cohort.

“Further validation in a more diverse population should be considered,” the investigators wrote.
 

A ‘useful’ tool for guiding therapy

The investigators noted that chemotherapy is a complex decision for older adults with stage I-III breast cancer. While it may be indicated, chemotherapy is underused often because of the higher risk of severe toxicity in older people.

“Unfortunately, older adults aged 65 and over, who comprise about half of all breast cancer diagnoses, are significantly less likely to be offered chemotherapy compared to younger patients – sometimes because their doctors fear they won’t be able to tolerate it,” investigator Mina Sedrak, MD, of City of Hope National Medical Center in Duarte, Calif., said in a press release.

The CARG-BC score may be useful to direct therapy in older adults with early-stage breast cancer, the investigators wrote. They noted that intensifying supportive care and developing modified treatment regimens may be appropriate for patients at higher risk for toxicity.

“Although this score should not be used as the only factor in deciding whether to administer and/or alter the dose or schedule of chemotherapy, the CARG-BC score can be used to facilitate this complex decision-making process, along with clinical judgment and patient preferences,” they wrote.

“I think this is a great tool. [It] will be helpful to me to have a more accurate conversation with geriatric patients about the actual risk/benefit ratio for chemotherapy in early breast cancer,” said Amy Tiersten, MD, of Mount Sinai Hospital in New York, when asked for comment.

“If routinely implemented, it may help reduce age bias and also identify older patients who may look well but may be vulnerable and quickly decompensate while undergoing treatment,” said Lidia Schapira, MD, of Stanford (Calif.) University. “Importantly, it can be used to guide conversations about trade-offs and to start a frank conversation about an older patient’s fears and concerns about treatment.”

This research was funded by the National Institute on Aging, the Breast Cancer Research Foundation, and the Center for Cancer and Aging at City of Hope. The investigators, Dr. Schapira, and Dr. Tiersten had no relevant disclosures.

[email protected]

For patients with intermediate- or high-risk ductal carcinoma in situ (DCIS) treated with conservative surgery and whole breast irradiation (WBI), adding a boost dose to the tumor bed significantly reduced the risk of recurrence, regardless of WBI fractionation, in the BIG-3-07/TROG 07.01 trial.

Giving a tumor bed boost (TBB) reduced the risk of local recurrence and overall disease recurrence, but there were no significant differences in recurrence rates between conventional WBI and hypofractionated WBI.

Boon Hui Chua, MD, of the University of New South Wales, Sydney, presented these results at the 2020 San Antonio Breast Cancer Symposium.

Dr. Chua and colleagues studied 1,608 women with DCIS resected by conservative surgery. Patients were either younger than 50 years or age 50 and older with at least one of the following risk factors: symptomatic presentation, palpable tumor, multifocal disease, tumor size 1.5 cm or larger, intermediate or high nuclear grade, central necrosis, comedo histology, and/or surgical margins less than 10 mm.

The patients were randomized to treatment in three categories. In randomization A (n = 503), patients were randomized to one of the following treatments:

• WBI at 50 Gy in 25 fractions
• WBI at 42.5 Gy in 16 fractions
• WBI at 50 Gy in 25 fractions plus TBB at 16 Gy in 8 fractions
• WBI at 42.5 Gy in 16 fractions plus TBB at 16 Gy in 8 fractions.

In randomization B (n = 581), patients received WBI at 50 Gy in 25 fractions, with or without TBB at 16 Gy in 8 fractions. In randomization C (n = 524), patients received WBI at 42.5 Gy in 16 fractions, with or without TBB at 16 Gy in 8 fractions.

All patients underwent CT-based radiation planning. WBI was delivered with tangential MV photon beams, and TBB was performed with CT contouring of protocol-defined tumor bed target volumes, with electron or photon energy. The median follow-up was 6.6 years.
 

Giving a boost to better outcomes

The 5-year rate of freedom from local recurrence was 97% for patients who received TBB and 93% for patients who did not (hazard ratio, 0.47; P < .001). The benefit of TBB was consistent across subgroups.

There were no significant differences in 5-year rates of freedom from local recurrence by WBI fractionation, either in randomization A (P = .837) or among all randomized patients (P = .887).

The tests for interactions between TBB and WBI fractionation on local recurrence were not significant in randomization A (P = .89) or in all randomized patients (P = .89).

The risk of overall disease recurrence was lower among patients who had received TBB, with an HR of 0.63 (P = .004). The 5-year rate of freedom from disease recurrence was 97% with TBB and 91% with no boost (P = .002).

There were no significant differences in freedom from disease recurrence rates by WBI fractionation either in randomization A (P = .443) or among all randomized patients (P = .605).

Acute radiation dermatitis occurred in significantly more patients who received TBB (P = .006), as did late breast pain (P = .003), induration or fibrosis (P < .0001), and telangiectasia (P = .02). There were no significant differences by boost status for acute or late fatigue, pneumonitis, cardiac complications, or second malignancies.
 

Reduce the boost dose?

A radiation oncologist who was not involved in this study said that, while the results confirm a benefit of boost dose for patients with non–low-risk DCIS, the doses used in the BIG-3-07 study may be higher than needed to achieve a protective effect.

“Here in America, we usually give 10 Gy in five fractions, and, in many countries, actually, it’s 10 Gy in five fractions, although a few European centers give 16 Gy in eight fractions,” said Alphose Taghian, MD, of Massachusetts General Hospital in Boston.

“I personally only give 10 Gy in five fractions. I am not under the impression that 16 Gy in eight fractions will give better results. The local failure rate is so low, it’s likely that 10 Gy will do the job,” Dr. Taghian said in an interview.

Dr. Taghian noted that raising the dose to 16 Gy increases the risk of fibrosis, as seen in the BIG-3-07 trial.

Nonetheless, the trial demonstrates the benefit of radiation boost dose in patients with high-risk DCIS, he said, adding that the local recurrence-free benefit curves may separate further with longer follow-up.

The study was sponsored by the Trans Tasman Radiation Oncology Group. Dr. Chua and Dr. Taghian reported no conflicts of interest.

For patients with intermediate- or high-risk ductal carcinoma in situ (DCIS) treated with conservative surgery and whole breast irradiation (WBI), adding a boost dose to the tumor bed significantly reduced the risk of recurrence, regardless of WBI fractionation, in the BIG-3-07/TROG 07.01 trial.

Giving a tumor bed boost (TBB) reduced the risk of local recurrence and overall disease recurrence, but there were no significant differences in recurrence rates between conventional WBI and hypofractionated WBI.

Boon Hui Chua, MD, of the University of New South Wales, Sydney, presented these results at the 2020 San Antonio Breast Cancer Symposium.

Dr. Chua and colleagues studied 1,608 women with DCIS resected by conservative surgery. Patients were either younger than 50 years or age 50 and older with at least one of the following risk factors: symptomatic presentation, palpable tumor, multifocal disease, tumor size 1.5 cm or larger, intermediate or high nuclear grade, central necrosis, comedo histology, and/or surgical margins less than 10 mm.

The patients were randomized to treatment in three categories. In randomization A (n = 503), patients were randomized to one of the following treatments:

• WBI at 50 Gy in 25 fractions
• WBI at 42.5 Gy in 16 fractions
• WBI at 50 Gy in 25 fractions plus TBB at 16 Gy in 8 fractions
• WBI at 42.5 Gy in 16 fractions plus TBB at 16 Gy in 8 fractions.

In randomization B (n = 581), patients received WBI at 50 Gy in 25 fractions, with or without TBB at 16 Gy in 8 fractions. In randomization C (n = 524), patients received WBI at 42.5 Gy in 16 fractions, with or without TBB at 16 Gy in 8 fractions.

All patients underwent CT-based radiation planning. WBI was delivered with tangential MV photon beams, and TBB was performed with CT contouring of protocol-defined tumor bed target volumes, with electron or photon energy. The median follow-up was 6.6 years.
 

Giving a boost to better outcomes

The 5-year rate of freedom from local recurrence was 97% for patients who received TBB and 93% for patients who did not (hazard ratio, 0.47; P < .001). The benefit of TBB was consistent across subgroups.

There were no significant differences in 5-year rates of freedom from local recurrence by WBI fractionation, either in randomization A (P = .837) or among all randomized patients (P = .887).

The tests for interactions between TBB and WBI fractionation on local recurrence were not significant in randomization A (P = .89) or in all randomized patients (P = .89).

The risk of overall disease recurrence was lower among patients who had received TBB, with an HR of 0.63 (P = .004). The 5-year rate of freedom from disease recurrence was 97% with TBB and 91% with no boost (P = .002).

There were no significant differences in freedom from disease recurrence rates by WBI fractionation either in randomization A (P = .443) or among all randomized patients (P = .605).

Acute radiation dermatitis occurred in significantly more patients who received TBB (P = .006), as did late breast pain (P = .003), induration or fibrosis (P < .0001), and telangiectasia (P = .02). There were no significant differences by boost status for acute or late fatigue, pneumonitis, cardiac complications, or second malignancies.
 

Reduce the boost dose?

A radiation oncologist who was not involved in this study said that, while the results confirm a benefit of boost dose for patients with non–low-risk DCIS, the doses used in the BIG-3-07 study may be higher than needed to achieve a protective effect.

“Here in America, we usually give 10 Gy in five fractions, and, in many countries, actually, it’s 10 Gy in five fractions, although a few European centers give 16 Gy in eight fractions,” said Alphose Taghian, MD, of Massachusetts General Hospital in Boston.

“I personally only give 10 Gy in five fractions. I am not under the impression that 16 Gy in eight fractions will give better results. The local failure rate is so low, it’s likely that 10 Gy will do the job,” Dr. Taghian said in an interview.

Dr. Taghian noted that raising the dose to 16 Gy increases the risk of fibrosis, as seen in the BIG-3-07 trial.

Nonetheless, the trial demonstrates the benefit of radiation boost dose in patients with high-risk DCIS, he said, adding that the local recurrence-free benefit curves may separate further with longer follow-up.

The study was sponsored by the Trans Tasman Radiation Oncology Group. Dr. Chua and Dr. Taghian reported no conflicts of interest.

For patients with intermediate- or high-risk ductal carcinoma in situ (DCIS) treated with conservative surgery and whole breast irradiation (WBI), adding a boost dose to the tumor bed significantly reduced the risk of recurrence, regardless of WBI fractionation, in the BIG-3-07/TROG 07.01 trial.

Giving a tumor bed boost (TBB) reduced the risk of local recurrence and overall disease recurrence, but there were no significant differences in recurrence rates between conventional WBI and hypofractionated WBI.

Boon Hui Chua, MD, of the University of New South Wales, Sydney, presented these results at the 2020 San Antonio Breast Cancer Symposium.

Dr. Chua and colleagues studied 1,608 women with DCIS resected by conservative surgery. Patients were either younger than 50 years or age 50 and older with at least one of the following risk factors: symptomatic presentation, palpable tumor, multifocal disease, tumor size 1.5 cm or larger, intermediate or high nuclear grade, central necrosis, comedo histology, and/or surgical margins less than 10 mm.

The patients were randomized to treatment in three categories. In randomization A (n = 503), patients were randomized to one of the following treatments:

• WBI at 50 Gy in 25 fractions
• WBI at 42.5 Gy in 16 fractions
• WBI at 50 Gy in 25 fractions plus TBB at 16 Gy in 8 fractions
• WBI at 42.5 Gy in 16 fractions plus TBB at 16 Gy in 8 fractions.

In randomization B (n = 581), patients received WBI at 50 Gy in 25 fractions, with or without TBB at 16 Gy in 8 fractions. In randomization C (n = 524), patients received WBI at 42.5 Gy in 16 fractions, with or without TBB at 16 Gy in 8 fractions.

All patients underwent CT-based radiation planning. WBI was delivered with tangential MV photon beams, and TBB was performed with CT contouring of protocol-defined tumor bed target volumes, with electron or photon energy. The median follow-up was 6.6 years.
 

Giving a boost to better outcomes

The 5-year rate of freedom from local recurrence was 97% for patients who received TBB and 93% for patients who did not (hazard ratio, 0.47; P < .001). The benefit of TBB was consistent across subgroups.

There were no significant differences in 5-year rates of freedom from local recurrence by WBI fractionation, either in randomization A (P = .837) or among all randomized patients (P = .887).

The tests for interactions between TBB and WBI fractionation on local recurrence were not significant in randomization A (P = .89) or in all randomized patients (P = .89).

The risk of overall disease recurrence was lower among patients who had received TBB, with an HR of 0.63 (P = .004). The 5-year rate of freedom from disease recurrence was 97% with TBB and 91% with no boost (P = .002).

There were no significant differences in freedom from disease recurrence rates by WBI fractionation either in randomization A (P = .443) or among all randomized patients (P = .605).

Acute radiation dermatitis occurred in significantly more patients who received TBB (P = .006), as did late breast pain (P = .003), induration or fibrosis (P < .0001), and telangiectasia (P = .02). There were no significant differences by boost status for acute or late fatigue, pneumonitis, cardiac complications, or second malignancies.
 

Reduce the boost dose?

A radiation oncologist who was not involved in this study said that, while the results confirm a benefit of boost dose for patients with non–low-risk DCIS, the doses used in the BIG-3-07 study may be higher than needed to achieve a protective effect.

“Here in America, we usually give 10 Gy in five fractions, and, in many countries, actually, it’s 10 Gy in five fractions, although a few European centers give 16 Gy in eight fractions,” said Alphose Taghian, MD, of Massachusetts General Hospital in Boston.

“I personally only give 10 Gy in five fractions. I am not under the impression that 16 Gy in eight fractions will give better results. The local failure rate is so low, it’s likely that 10 Gy will do the job,” Dr. Taghian said in an interview.

Dr. Taghian noted that raising the dose to 16 Gy increases the risk of fibrosis, as seen in the BIG-3-07 trial.

Nonetheless, the trial demonstrates the benefit of radiation boost dose in patients with high-risk DCIS, he said, adding that the local recurrence-free benefit curves may separate further with longer follow-up.

The study was sponsored by the Trans Tasman Radiation Oncology Group. Dr. Chua and Dr. Taghian reported no conflicts of interest.

Most clinicians who treat migraine know the statistics associated with this debilitating condition and can recite them almost verbatim. Likewise, we all know the long journey a patient experiencing headache can take before finding relief.

The question is, what can we do about it?  It can sometimes feel easy to look at the statistics, accept them with little objection, and move on, but we must do the best we can for our patients in the face of the migraine challenge.

It’s a journey that I welcome you to take with me as we evaluate important migraine  trends, treatments, and controversies, and figure out how to leverage these developments to improve outcomes and help our patients improve and feel and function better.

There are upwards of 39 million migraine sufferers in the US who are on a journey of their own that is often perplexing, frustrating, and can feel fruitless. According to the Migraine Research Foundation, most migraine sufferers do not seek medical treatment. More than half of patients who experience migraine are never diagnosed. Moreover, only 4% receive care from headache and pain specialists. Perhaps most disheartening, an estimated 5 million migraine sufferers, who we believe can benefit from preventive treatment, are not receiving it.

The patient journey can be extremely discouraging and often maddening. Results from the American Migraine Study show that nearly four in every 10 migraine patients  suffer 3 years or more before being diagnosed. A cross-sectional study published in 2019 analyzed treatments, procedures, and follow-up approaches experienced by 456 migraine sufferers until their initial consult with a headache specialist. Patients reported an average headache frequency of approximately 16 days per month. More than half were found to have chronic migraine, and 3 in every 10 had migraine with aura. Despite these characteristics—which were apparently hiding in plain sight—it took patients in this study an average of about 17 years from pain onset to make the journey to an appointment with a headache specialist. That is hard to believe, let alone to understand. Along the way, many migraineurs—particularly those with chronic migraine—were subjected to unnecessary exams and treatments.

Results like these do not come cheaply for families, society, and the health care system. Migraine is estimated to cost more than $20 million per year in direct medical expenses and lost productivity in the US, according to the American Migraine Foundation. Others have estimated double that number. Sufferers, meanwhile, face the prospect of significant pain, stigma and ongoing disability. More than 8 in every 10participants in the American Migraine Study had at least some headache-related disability. More than half say their pain caused severe impairment, even requiring bed rest. 

I believe we can help our migraine patients along this journey—and we can make it less arduous for them. We have education, tools, and treatments to help them. Learn how by joining me here each month. We will address the practical relevance of topics such as acute and preventive care (including the new gepants and CGRP-targeted treatments), new and more effective treatments for medication overuse headache, new treatment devices, behavioral approaches to migraine, and our role in headache advocacy, including stigma avoidance. We will not shy away from controversial topics such as the changing definition of chronic migraine, monoclonal antibody safety , high and low cerebrospinal fluid pressure syndromes, and more. See you next month.

Most clinicians who treat migraine know the statistics associated with this debilitating condition and can recite them almost verbatim. Likewise, we all know the long journey a patient experiencing headache can take before finding relief.

The question is, what can we do about it?  It can sometimes feel easy to look at the statistics, accept them with little objection, and move on, but we must do the best we can for our patients in the face of the migraine challenge.

It’s a journey that I welcome you to take with me as we evaluate important migraine  trends, treatments, and controversies, and figure out how to leverage these developments to improve outcomes and help our patients improve and feel and function better.

There are upwards of 39 million migraine sufferers in the US who are on a journey of their own that is often perplexing, frustrating, and can feel fruitless. According to the Migraine Research Foundation, most migraine sufferers do not seek medical treatment. More than half of patients who experience migraine are never diagnosed. Moreover, only 4% receive care from headache and pain specialists. Perhaps most disheartening, an estimated 5 million migraine sufferers, who we believe can benefit from preventive treatment, are not receiving it.

The patient journey can be extremely discouraging and often maddening. Results from the American Migraine Study show that nearly four in every 10 migraine patients  suffer 3 years or more before being diagnosed. A cross-sectional study published in 2019 analyzed treatments, procedures, and follow-up approaches experienced by 456 migraine sufferers until their initial consult with a headache specialist. Patients reported an average headache frequency of approximately 16 days per month. More than half were found to have chronic migraine, and 3 in every 10 had migraine with aura. Despite these characteristics—which were apparently hiding in plain sight—it took patients in this study an average of about 17 years from pain onset to make the journey to an appointment with a headache specialist. That is hard to believe, let alone to understand. Along the way, many migraineurs—particularly those with chronic migraine—were subjected to unnecessary exams and treatments.

Results like these do not come cheaply for families, society, and the health care system. Migraine is estimated to cost more than $20 million per year in direct medical expenses and lost productivity in the US, according to the American Migraine Foundation. Others have estimated double that number. Sufferers, meanwhile, face the prospect of significant pain, stigma and ongoing disability. More than 8 in every 10participants in the American Migraine Study had at least some headache-related disability. More than half say their pain caused severe impairment, even requiring bed rest. 

I believe we can help our migraine patients along this journey—and we can make it less arduous for them. We have education, tools, and treatments to help them. Learn how by joining me here each month. We will address the practical relevance of topics such as acute and preventive care (including the new gepants and CGRP-targeted treatments), new and more effective treatments for medication overuse headache, new treatment devices, behavioral approaches to migraine, and our role in headache advocacy, including stigma avoidance. We will not shy away from controversial topics such as the changing definition of chronic migraine, monoclonal antibody safety , high and low cerebrospinal fluid pressure syndromes, and more. See you next month.

Most clinicians who treat migraine know the statistics associated with this debilitating condition and can recite them almost verbatim. Likewise, we all know the long journey a patient experiencing headache can take before finding relief.

The question is, what can we do about it?  It can sometimes feel easy to look at the statistics, accept them with little objection, and move on, but we must do the best we can for our patients in the face of the migraine challenge.

It’s a journey that I welcome you to take with me as we evaluate important migraine  trends, treatments, and controversies, and figure out how to leverage these developments to improve outcomes and help our patients improve and feel and function better.

There are upwards of 39 million migraine sufferers in the US who are on a journey of their own that is often perplexing, frustrating, and can feel fruitless. According to the Migraine Research Foundation, most migraine sufferers do not seek medical treatment. More than half of patients who experience migraine are never diagnosed. Moreover, only 4% receive care from headache and pain specialists. Perhaps most disheartening, an estimated 5 million migraine sufferers, who we believe can benefit from preventive treatment, are not receiving it.

The patient journey can be extremely discouraging and often maddening. Results from the American Migraine Study show that nearly four in every 10 migraine patients  suffer 3 years or more before being diagnosed. A cross-sectional study published in 2019 analyzed treatments, procedures, and follow-up approaches experienced by 456 migraine sufferers until their initial consult with a headache specialist. Patients reported an average headache frequency of approximately 16 days per month. More than half were found to have chronic migraine, and 3 in every 10 had migraine with aura. Despite these characteristics—which were apparently hiding in plain sight—it took patients in this study an average of about 17 years from pain onset to make the journey to an appointment with a headache specialist. That is hard to believe, let alone to understand. Along the way, many migraineurs—particularly those with chronic migraine—were subjected to unnecessary exams and treatments.

Results like these do not come cheaply for families, society, and the health care system. Migraine is estimated to cost more than $20 million per year in direct medical expenses and lost productivity in the US, according to the American Migraine Foundation. Others have estimated double that number. Sufferers, meanwhile, face the prospect of significant pain, stigma and ongoing disability. More than 8 in every 10participants in the American Migraine Study had at least some headache-related disability. More than half say their pain caused severe impairment, even requiring bed rest. 

I believe we can help our migraine patients along this journey—and we can make it less arduous for them. We have education, tools, and treatments to help them. Learn how by joining me here each month. We will address the practical relevance of topics such as acute and preventive care (including the new gepants and CGRP-targeted treatments), new and more effective treatments for medication overuse headache, new treatment devices, behavioral approaches to migraine, and our role in headache advocacy, including stigma avoidance. We will not shy away from controversial topics such as the changing definition of chronic migraine, monoclonal antibody safety , high and low cerebrospinal fluid pressure syndromes, and more. See you next month.

For the second year in a row, mortality from cancer has fallen in the United States, driven largely by reductions in the incidence of, and death from, non–small cell lung cancer (NSCLC) in men and women, according to a new report from the American Cancer Society.

The study was published online Jan. 12 in CA: A Cancer Journal for Clinicians.

“Mortality rates are a better indicator of progress against cancer than incidence or survival because they are less affected by biases resulting from changes in detection practices,” wrote the authors, led by Rebecca Siegel, MPH, American Cancer Society, Atlanta.  

“The overall drop of 31% as of 2018 [since the early 1990s] translates to an estimated 3,188,500 fewer cancer deaths (2,170,700 in men and 1,017,800 in women) than what would have occurred if mortality rates had remained at their peak,” the researchers added.

Lung cancer accounted for 46% of the total decline in cancer mortality in the past 5 years, with a record, single-year drop of 2.4% between 2017 and 2018.

The recent and rapid reductions in lung cancer mortality reflect better treatments for NSCLC, the authors suggested. For example, survival rates at 2 years have increased from 34% for patients diagnosed with NSCLC between 2009 and 2010 to 42% for those diagnosed during 2015 and 2016 – an absolute gain of 5%-6% in survival odds for every stage of diagnosis.

On a more somber note, the authors warned that COVID-19 is predicted to have a negative impact on both the diagnosis and outcomes of patients with cancer in the near future.  

“We anticipate that disruptions in access to cancer care in 2020 will lead to downstream increases in advanced stage diagnoses that may impede progress in reducing cancer mortality rates in the years to come,” Ms. Siegel said in a statement.
 

New cancer cases

The report provides an estimated number of new cancer cases and deaths in 2021 in the United States (nationally and state-by-state) based on the most current population-based data for cancer incidence through 2017 and for mortality through 2018. “An estimated 608,570 Americans will die from cancer in 2021, corresponding to more than 1600 deaths per day,” Ms. Siegel and colleagues reported.

The greatest number of deaths are predicted to be from the most common cancers: Lung, prostate, and colorectal cancer in men and lung, breast, and colorectal cancer in women, they added. However, the mortality rates for all four cancers are continuing to fall.

As of 2018, the death rate from lung cancer had dropped by 54% among males and by 30% among females over the past few decades, the investigators noted.

Mortality from female breast cancer has dropped by 41% since 1989; by 52% for prostate cancer since 1993; and by 53% and 59% for colorectal cancer for men (since 1980) and women (since 1969), respectively.

“However, in recent years, mortality declines have slowed for breast cancer and [colorectal cancer] and have halted for prostate cancer,” the researchers noted.

In contrast, the pace of the annual decline in lung cancer mortality doubled among men from 3.1% between 2009 and 2013 to 5.5% between 2014 and 2018, and from 1.8% to 4.4% among women during the same time intervals.
 

Increase in incidence at common sites

Despite the steady progress in mortality for most cancers, “rates continue to increase for some common sites,” Ms. Siegel and colleagues reported.

For example, death rates from uterine corpus cancer have accelerated from the late 1990s at twice the pace of the increase in its incidence. Death rates also have increased for cancers of the oral cavity and pharynx – although in this cancer, increases in mortality parallel an increase in its incidence. 

“Pancreatic cancer death rates [in turn] continued to increase slowly in men ... but remained stable in women, despite incidence [rates] rising by about 1% per year in both sexes,” the authors observed.

Meanwhile, the incidence of cervical cancer, although declining for decades overall, is increasing for patients who present with more distant-stage disease as well as cervical adenocarcinoma, both of which are often undetected by cytology.

“These findings underscore the need for more targeted efforts to increase both HPV [human papillomavirus] vaccination among all individuals aged [26 and younger] and primary HPV testing or HPV/cytology co-testing every 5 years among women beginning at age 25,” the authors emphasized.

On a more positive note, the long-term increase in mortality from liver cancer has recently slowed among women and has stabilized among men, they added.

Once again, disparities in both cancer occurrence and outcomes varied considerably between racial and ethnic groups. For example, cancer is the leading cause of death in people who are Hispanic, Asian American, and Alaska Native. Survival rates at 5 years for almost all cancers are still higher for White patients than for Black patients, although the disparity in cancer mortality between Black persons and White persons has declined to 13% from a peak of 33% in 1993.

Geographic disparities in cancer mortality rates still prevail; the rates are largest for preventable cancers such as lung and cervical cancer, for which mortality varies by as much as fivefold across states.

And although cancer remains the second most common cause of death among children, death rates from cancer have continuously declined over time among both children and adolescents, largely the result of dramatic declines in death rates from leukemia in both age groups.

The study authors have disclosed no relevant financial relationships.

A version of this article first appeared on Medscape.com.

For the second year in a row, mortality from cancer has fallen in the United States, driven largely by reductions in the incidence of, and death from, non–small cell lung cancer (NSCLC) in men and women, according to a new report from the American Cancer Society.

The study was published online Jan. 12 in CA: A Cancer Journal for Clinicians.

“Mortality rates are a better indicator of progress against cancer than incidence or survival because they are less affected by biases resulting from changes in detection practices,” wrote the authors, led by Rebecca Siegel, MPH, American Cancer Society, Atlanta.  

“The overall drop of 31% as of 2018 [since the early 1990s] translates to an estimated 3,188,500 fewer cancer deaths (2,170,700 in men and 1,017,800 in women) than what would have occurred if mortality rates had remained at their peak,” the researchers added.

Lung cancer accounted for 46% of the total decline in cancer mortality in the past 5 years, with a record, single-year drop of 2.4% between 2017 and 2018.

The recent and rapid reductions in lung cancer mortality reflect better treatments for NSCLC, the authors suggested. For example, survival rates at 2 years have increased from 34% for patients diagnosed with NSCLC between 2009 and 2010 to 42% for those diagnosed during 2015 and 2016 – an absolute gain of 5%-6% in survival odds for every stage of diagnosis.

On a more somber note, the authors warned that COVID-19 is predicted to have a negative impact on both the diagnosis and outcomes of patients with cancer in the near future.  

“We anticipate that disruptions in access to cancer care in 2020 will lead to downstream increases in advanced stage diagnoses that may impede progress in reducing cancer mortality rates in the years to come,” Ms. Siegel said in a statement.
 

New cancer cases

The report provides an estimated number of new cancer cases and deaths in 2021 in the United States (nationally and state-by-state) based on the most current population-based data for cancer incidence through 2017 and for mortality through 2018. “An estimated 608,570 Americans will die from cancer in 2021, corresponding to more than 1600 deaths per day,” Ms. Siegel and colleagues reported.

The greatest number of deaths are predicted to be from the most common cancers: Lung, prostate, and colorectal cancer in men and lung, breast, and colorectal cancer in women, they added. However, the mortality rates for all four cancers are continuing to fall.

As of 2018, the death rate from lung cancer had dropped by 54% among males and by 30% among females over the past few decades, the investigators noted.

Mortality from female breast cancer has dropped by 41% since 1989; by 52% for prostate cancer since 1993; and by 53% and 59% for colorectal cancer for men (since 1980) and women (since 1969), respectively.

“However, in recent years, mortality declines have slowed for breast cancer and [colorectal cancer] and have halted for prostate cancer,” the researchers noted.

In contrast, the pace of the annual decline in lung cancer mortality doubled among men from 3.1% between 2009 and 2013 to 5.5% between 2014 and 2018, and from 1.8% to 4.4% among women during the same time intervals.
 

Increase in incidence at common sites

Despite the steady progress in mortality for most cancers, “rates continue to increase for some common sites,” Ms. Siegel and colleagues reported.

For example, death rates from uterine corpus cancer have accelerated from the late 1990s at twice the pace of the increase in its incidence. Death rates also have increased for cancers of the oral cavity and pharynx – although in this cancer, increases in mortality parallel an increase in its incidence. 

“Pancreatic cancer death rates [in turn] continued to increase slowly in men ... but remained stable in women, despite incidence [rates] rising by about 1% per year in both sexes,” the authors observed.

Meanwhile, the incidence of cervical cancer, although declining for decades overall, is increasing for patients who present with more distant-stage disease as well as cervical adenocarcinoma, both of which are often undetected by cytology.

“These findings underscore the need for more targeted efforts to increase both HPV [human papillomavirus] vaccination among all individuals aged [26 and younger] and primary HPV testing or HPV/cytology co-testing every 5 years among women beginning at age 25,” the authors emphasized.

On a more positive note, the long-term increase in mortality from liver cancer has recently slowed among women and has stabilized among men, they added.

Once again, disparities in both cancer occurrence and outcomes varied considerably between racial and ethnic groups. For example, cancer is the leading cause of death in people who are Hispanic, Asian American, and Alaska Native. Survival rates at 5 years for almost all cancers are still higher for White patients than for Black patients, although the disparity in cancer mortality between Black persons and White persons has declined to 13% from a peak of 33% in 1993.

Geographic disparities in cancer mortality rates still prevail; the rates are largest for preventable cancers such as lung and cervical cancer, for which mortality varies by as much as fivefold across states.

And although cancer remains the second most common cause of death among children, death rates from cancer have continuously declined over time among both children and adolescents, largely the result of dramatic declines in death rates from leukemia in both age groups.

The study authors have disclosed no relevant financial relationships.

A version of this article first appeared on Medscape.com.

For the second year in a row, mortality from cancer has fallen in the United States, driven largely by reductions in the incidence of, and death from, non–small cell lung cancer (NSCLC) in men and women, according to a new report from the American Cancer Society.

The study was published online Jan. 12 in CA: A Cancer Journal for Clinicians.

“Mortality rates are a better indicator of progress against cancer than incidence or survival because they are less affected by biases resulting from changes in detection practices,” wrote the authors, led by Rebecca Siegel, MPH, American Cancer Society, Atlanta.  

“The overall drop of 31% as of 2018 [since the early 1990s] translates to an estimated 3,188,500 fewer cancer deaths (2,170,700 in men and 1,017,800 in women) than what would have occurred if mortality rates had remained at their peak,” the researchers added.

Lung cancer accounted for 46% of the total decline in cancer mortality in the past 5 years, with a record, single-year drop of 2.4% between 2017 and 2018.

The recent and rapid reductions in lung cancer mortality reflect better treatments for NSCLC, the authors suggested. For example, survival rates at 2 years have increased from 34% for patients diagnosed with NSCLC between 2009 and 2010 to 42% for those diagnosed during 2015 and 2016 – an absolute gain of 5%-6% in survival odds for every stage of diagnosis.

On a more somber note, the authors warned that COVID-19 is predicted to have a negative impact on both the diagnosis and outcomes of patients with cancer in the near future.  

“We anticipate that disruptions in access to cancer care in 2020 will lead to downstream increases in advanced stage diagnoses that may impede progress in reducing cancer mortality rates in the years to come,” Ms. Siegel said in a statement.
 

New cancer cases

The report provides an estimated number of new cancer cases and deaths in 2021 in the United States (nationally and state-by-state) based on the most current population-based data for cancer incidence through 2017 and for mortality through 2018. “An estimated 608,570 Americans will die from cancer in 2021, corresponding to more than 1600 deaths per day,” Ms. Siegel and colleagues reported.

The greatest number of deaths are predicted to be from the most common cancers: Lung, prostate, and colorectal cancer in men and lung, breast, and colorectal cancer in women, they added. However, the mortality rates for all four cancers are continuing to fall.

As of 2018, the death rate from lung cancer had dropped by 54% among males and by 30% among females over the past few decades, the investigators noted.

Mortality from female breast cancer has dropped by 41% since 1989; by 52% for prostate cancer since 1993; and by 53% and 59% for colorectal cancer for men (since 1980) and women (since 1969), respectively.

“However, in recent years, mortality declines have slowed for breast cancer and [colorectal cancer] and have halted for prostate cancer,” the researchers noted.

In contrast, the pace of the annual decline in lung cancer mortality doubled among men from 3.1% between 2009 and 2013 to 5.5% between 2014 and 2018, and from 1.8% to 4.4% among women during the same time intervals.
 

Increase in incidence at common sites

Despite the steady progress in mortality for most cancers, “rates continue to increase for some common sites,” Ms. Siegel and colleagues reported.

For example, death rates from uterine corpus cancer have accelerated from the late 1990s at twice the pace of the increase in its incidence. Death rates also have increased for cancers of the oral cavity and pharynx – although in this cancer, increases in mortality parallel an increase in its incidence. 

“Pancreatic cancer death rates [in turn] continued to increase slowly in men ... but remained stable in women, despite incidence [rates] rising by about 1% per year in both sexes,” the authors observed.

Meanwhile, the incidence of cervical cancer, although declining for decades overall, is increasing for patients who present with more distant-stage disease as well as cervical adenocarcinoma, both of which are often undetected by cytology.

“These findings underscore the need for more targeted efforts to increase both HPV [human papillomavirus] vaccination among all individuals aged [26 and younger] and primary HPV testing or HPV/cytology co-testing every 5 years among women beginning at age 25,” the authors emphasized.

On a more positive note, the long-term increase in mortality from liver cancer has recently slowed among women and has stabilized among men, they added.

Once again, disparities in both cancer occurrence and outcomes varied considerably between racial and ethnic groups. For example, cancer is the leading cause of death in people who are Hispanic, Asian American, and Alaska Native. Survival rates at 5 years for almost all cancers are still higher for White patients than for Black patients, although the disparity in cancer mortality between Black persons and White persons has declined to 13% from a peak of 33% in 1993.

Geographic disparities in cancer mortality rates still prevail; the rates are largest for preventable cancers such as lung and cervical cancer, for which mortality varies by as much as fivefold across states.

And although cancer remains the second most common cause of death among children, death rates from cancer have continuously declined over time among both children and adolescents, largely the result of dramatic declines in death rates from leukemia in both age groups.

The study authors have disclosed no relevant financial relationships.

A version of this article first appeared on Medscape.com.

When results of the TAILORx trial were presented at ASCO 2018, many oncologists thought it seemed too simple that a single number from a genomic assay could separate patients who would and would not benefit from adjuvant postoperative chemotherapy.

Those oncologists were right to be skeptical. Subsequent data indicated that better predictive tools were needed.

A new tool called “RSClin” may fit the bill. RSClin integrates the prognostic and predictive value of the 21-gene Oncotype DX recurrence score (RS) with the additional prognostic information conveyed by patient age, tumor grade, and tumor size.

RSClin provides individualized estimates of distant relapse risk for women with node-negative, endocrine sensitive, HER2/neu oncogene-negative early breast cancer – and a quantification of the additive freedom from distant relapse if that patient receives adjuvant chemotherapy. The tool is now available via a tab on the professional portal at https://online.genomichealth.com/.

Details on RSClin, including how the tool was developed and validated, were presented at the 2020 San Antonio Breast Cancer Symposium by Joseph A. Sparano, MD, of Albert Einstein College of Medicine in New York.
 

Beyond the initial publication of TAILORx

Results from the TAILORx trial published in The New England Journal of Medicine in 2018 offered the potential for genomic risk assessment to guide the choice of postoperative therapy for many women with the most common type of primary breast cancer. The relative risk reduction with chemotherapy increased with increasing RS result.

Subsequent analyses of the TAILORx dataset, published in The New England Journal of Medicine and JAMA Oncology in 2019, examined the added effect of parameters of clinical risk (tumor size and grade) and patient age for patients with known genomic risk.

In these analyses, clinical risk was prognostic for recurrence but did not predict the absolute magnitude of chemotherapy benefit, regardless of age. There was a trend toward chemotherapy benefit in women who were younger than 50 years of age who had RS 21-15, but it was irrespective of clinical risk.
 

The development of RSClin

RSClin was derived from a patient-specific meta-analysis of 10,004 women with hormone receptor–positive, HER2-negative, node-negative breast cancer, of whom 9,427 participated in the TAILORx trial.

In TAILORx, which ran from 2006 to 2015, women with RS 0-11 received contemporary hormone therapy alone. Women with RS 12-25 were randomized to receive hormone therapy alone or with conventional combination chemotherapy. Women with RS above 26 received chemotherapy plus endocrine therapy.

The other patients in the meta-analysis participated in NSABP studies B-14 (tamoxifen versus placebo) and B-20 (tamoxifen versus chemotherapy plus tamoxifen).

Cox regression models were fit separately to each study with covariates of the continuous variables of RS result, tumor size, and patient age and the discrete variable of histologic tumor grade (assessed centrally in B-14 and in local laboratories in TAILORx). The prespecified endpoint was time to first distant recurrence.

RSClin estimates of distant recurrence risk were generated using baseline risk with TAILORx event rates to reflect current medical practice.

Model estimates were calculated for specified endocrine therapy with tamoxifen or aromatase inhibitors utilizing the treatment effect hazard ratio from an Early Breast Cancer Trialists’ Collaborative Group meta-analysis.

Patient-specific absolute benefit of chemotherapy was estimated by combining patient-specific meta-analysis risk estimates for distant recurrence and for relative chemotherapy benefit using the B-20 and TAILORx trials.
 

RSClin results and external validation

Among all patients in the meta-analysis cohort, RSClin provided a significantly more accurate prediction of distant recurrence events, in comparison with RS alone or clinical-pathologic factors alone.

External validation was performed using data from real-world outcomes from the 1,098 evaluable node-negative patients in the Clalit Health Services registry, of whom 876 received endocrine therapy alone and 222 received endocrine therapy plus chemotherapy.

RSClin estimates of distant recurrence closely approximated the observed risk in the registry (standardized hazard ratio, 1.73; 95% confidence interval, 1.40-2.15; P < .001). Within each RSClin risk quintile, the average 10-year risk estimate approached the observed Kaplan-Meier estimates in the cohort (Lin concordance correlation = 0.962).
 

Shared decision-making

For many years, the dilemma of whether to recommend adjuvant chemotherapy to a patient with early breast cancer has prompted the generation of tools to quantify a patient’s risk of recurrence and the magnitude of benefit for endocrine therapy and/or chemotherapy.

When the original Adjuvant! Online program was developed, genomic risk profiling was in its infancy. Genomic tools such as the 21-gene RS have subsequently demonstrated that they can help optimize the adjuvant treatment we recommend.

The RSClin tool provides more precise, individualized information than does clinical-pathological or genomic data alone. It prognosticates the risk of distant recurrence of breast cancer, which patients and providers fervently wish to minimize.

RSClin estimates the incremental benefit of contemporary adjuvant chemotherapy over modern endocrine therapy alone, in absolute values, for individual patients. This transparent, discrete, easily explained information is vital for counseling patients.

However, as highlighted in an editorial published in the Journal of Clinical Oncology, RSClin is not without its potential drawbacks. These include:

• Tumor heterogeneity leading to misleading results.
• Variable patient adherence to endocrine therapy or chemotherapy.
• The influence of comorbid conditions on the risk/benefit ratio.
• The potential of ovarian function suppression in young women to approach the magnitude of benefit associated with chemotherapy.

Accordingly, RSClin may be the latest and best available tool, but it will not be the last.

For patients with RS above 26, for older women with intermediate RS, and for younger women with a low RS and low clinical-pathologic features, RSClin may not influence treatment recommendations.

However, for the common scenario of an intermediate-risk RS and a mix of pathologic features, the accurate prognostication for distant recurrence risk and estimate of absolute benefit from chemotherapy will be terrifically helpful to oncology caregivers.

Dr. Sparano disclosed funding from the National Cancer Institute and travel support from Rhenium.
 

Dr. Lyss was a community-based medical oncologist and clinical researcher for more than 35 years before his recent retirement. His clinical and research interests were focused on breast and lung cancers, as well as expanding clinical trial access to medically underserved populations. He is based in St. Louis. He has no conflicts of interest.

When results of the TAILORx trial were presented at ASCO 2018, many oncologists thought it seemed too simple that a single number from a genomic assay could separate patients who would and would not benefit from adjuvant postoperative chemotherapy.

Those oncologists were right to be skeptical. Subsequent data indicated that better predictive tools were needed.

A new tool called “RSClin” may fit the bill. RSClin integrates the prognostic and predictive value of the 21-gene Oncotype DX recurrence score (RS) with the additional prognostic information conveyed by patient age, tumor grade, and tumor size.

RSClin provides individualized estimates of distant relapse risk for women with node-negative, endocrine sensitive, HER2/neu oncogene-negative early breast cancer – and a quantification of the additive freedom from distant relapse if that patient receives adjuvant chemotherapy. The tool is now available via a tab on the professional portal at https://online.genomichealth.com/.

Details on RSClin, including how the tool was developed and validated, were presented at the 2020 San Antonio Breast Cancer Symposium by Joseph A. Sparano, MD, of Albert Einstein College of Medicine in New York.
 

Beyond the initial publication of TAILORx

Results from the TAILORx trial published in The New England Journal of Medicine in 2018 offered the potential for genomic risk assessment to guide the choice of postoperative therapy for many women with the most common type of primary breast cancer. The relative risk reduction with chemotherapy increased with increasing RS result.

Subsequent analyses of the TAILORx dataset, published in The New England Journal of Medicine and JAMA Oncology in 2019, examined the added effect of parameters of clinical risk (tumor size and grade) and patient age for patients with known genomic risk.

In these analyses, clinical risk was prognostic for recurrence but did not predict the absolute magnitude of chemotherapy benefit, regardless of age. There was a trend toward chemotherapy benefit in women who were younger than 50 years of age who had RS 21-15, but it was irrespective of clinical risk.
 

The development of RSClin

RSClin was derived from a patient-specific meta-analysis of 10,004 women with hormone receptor–positive, HER2-negative, node-negative breast cancer, of whom 9,427 participated in the TAILORx trial.

In TAILORx, which ran from 2006 to 2015, women with RS 0-11 received contemporary hormone therapy alone. Women with RS 12-25 were randomized to receive hormone therapy alone or with conventional combination chemotherapy. Women with RS above 26 received chemotherapy plus endocrine therapy.

The other patients in the meta-analysis participated in NSABP studies B-14 (tamoxifen versus placebo) and B-20 (tamoxifen versus chemotherapy plus tamoxifen).

Cox regression models were fit separately to each study with covariates of the continuous variables of RS result, tumor size, and patient age and the discrete variable of histologic tumor grade (assessed centrally in B-14 and in local laboratories in TAILORx). The prespecified endpoint was time to first distant recurrence.

RSClin estimates of distant recurrence risk were generated using baseline risk with TAILORx event rates to reflect current medical practice.

Model estimates were calculated for specified endocrine therapy with tamoxifen or aromatase inhibitors utilizing the treatment effect hazard ratio from an Early Breast Cancer Trialists’ Collaborative Group meta-analysis.

Patient-specific absolute benefit of chemotherapy was estimated by combining patient-specific meta-analysis risk estimates for distant recurrence and for relative chemotherapy benefit using the B-20 and TAILORx trials.
 

RSClin results and external validation

Among all patients in the meta-analysis cohort, RSClin provided a significantly more accurate prediction of distant recurrence events, in comparison with RS alone or clinical-pathologic factors alone.

External validation was performed using data from real-world outcomes from the 1,098 evaluable node-negative patients in the Clalit Health Services registry, of whom 876 received endocrine therapy alone and 222 received endocrine therapy plus chemotherapy.

RSClin estimates of distant recurrence closely approximated the observed risk in the registry (standardized hazard ratio, 1.73; 95% confidence interval, 1.40-2.15; P < .001). Within each RSClin risk quintile, the average 10-year risk estimate approached the observed Kaplan-Meier estimates in the cohort (Lin concordance correlation = 0.962).
 

Shared decision-making

For many years, the dilemma of whether to recommend adjuvant chemotherapy to a patient with early breast cancer has prompted the generation of tools to quantify a patient’s risk of recurrence and the magnitude of benefit for endocrine therapy and/or chemotherapy.

When the original Adjuvant! Online program was developed, genomic risk profiling was in its infancy. Genomic tools such as the 21-gene RS have subsequently demonstrated that they can help optimize the adjuvant treatment we recommend.

The RSClin tool provides more precise, individualized information than does clinical-pathological or genomic data alone. It prognosticates the risk of distant recurrence of breast cancer, which patients and providers fervently wish to minimize.

RSClin estimates the incremental benefit of contemporary adjuvant chemotherapy over modern endocrine therapy alone, in absolute values, for individual patients. This transparent, discrete, easily explained information is vital for counseling patients.

However, as highlighted in an editorial published in the Journal of Clinical Oncology, RSClin is not without its potential drawbacks. These include:

• Tumor heterogeneity leading to misleading results.
• Variable patient adherence to endocrine therapy or chemotherapy.
• The influence of comorbid conditions on the risk/benefit ratio.
• The potential of ovarian function suppression in young women to approach the magnitude of benefit associated with chemotherapy.

Accordingly, RSClin may be the latest and best available tool, but it will not be the last.

For patients with RS above 26, for older women with intermediate RS, and for younger women with a low RS and low clinical-pathologic features, RSClin may not influence treatment recommendations.

However, for the common scenario of an intermediate-risk RS and a mix of pathologic features, the accurate prognostication for distant recurrence risk and estimate of absolute benefit from chemotherapy will be terrifically helpful to oncology caregivers.

Dr. Sparano disclosed funding from the National Cancer Institute and travel support from Rhenium.
 

Dr. Lyss was a community-based medical oncologist and clinical researcher for more than 35 years before his recent retirement. His clinical and research interests were focused on breast and lung cancers, as well as expanding clinical trial access to medically underserved populations. He is based in St. Louis. He has no conflicts of interest.

When results of the TAILORx trial were presented at ASCO 2018, many oncologists thought it seemed too simple that a single number from a genomic assay could separate patients who would and would not benefit from adjuvant postoperative chemotherapy.

Those oncologists were right to be skeptical. Subsequent data indicated that better predictive tools were needed.

A new tool called “RSClin” may fit the bill. RSClin integrates the prognostic and predictive value of the 21-gene Oncotype DX recurrence score (RS) with the additional prognostic information conveyed by patient age, tumor grade, and tumor size.

RSClin provides individualized estimates of distant relapse risk for women with node-negative, endocrine sensitive, HER2/neu oncogene-negative early breast cancer – and a quantification of the additive freedom from distant relapse if that patient receives adjuvant chemotherapy. The tool is now available via a tab on the professional portal at https://online.genomichealth.com/.

Details on RSClin, including how the tool was developed and validated, were presented at the 2020 San Antonio Breast Cancer Symposium by Joseph A. Sparano, MD, of Albert Einstein College of Medicine in New York.
 

Beyond the initial publication of TAILORx

Results from the TAILORx trial published in The New England Journal of Medicine in 2018 offered the potential for genomic risk assessment to guide the choice of postoperative therapy for many women with the most common type of primary breast cancer. The relative risk reduction with chemotherapy increased with increasing RS result.

Subsequent analyses of the TAILORx dataset, published in The New England Journal of Medicine and JAMA Oncology in 2019, examined the added effect of parameters of clinical risk (tumor size and grade) and patient age for patients with known genomic risk.

In these analyses, clinical risk was prognostic for recurrence but did not predict the absolute magnitude of chemotherapy benefit, regardless of age. There was a trend toward chemotherapy benefit in women who were younger than 50 years of age who had RS 21-15, but it was irrespective of clinical risk.
 

The development of RSClin

RSClin was derived from a patient-specific meta-analysis of 10,004 women with hormone receptor–positive, HER2-negative, node-negative breast cancer, of whom 9,427 participated in the TAILORx trial.

In TAILORx, which ran from 2006 to 2015, women with RS 0-11 received contemporary hormone therapy alone. Women with RS 12-25 were randomized to receive hormone therapy alone or with conventional combination chemotherapy. Women with RS above 26 received chemotherapy plus endocrine therapy.

The other patients in the meta-analysis participated in NSABP studies B-14 (tamoxifen versus placebo) and B-20 (tamoxifen versus chemotherapy plus tamoxifen).

Cox regression models were fit separately to each study with covariates of the continuous variables of RS result, tumor size, and patient age and the discrete variable of histologic tumor grade (assessed centrally in B-14 and in local laboratories in TAILORx). The prespecified endpoint was time to first distant recurrence.

RSClin estimates of distant recurrence risk were generated using baseline risk with TAILORx event rates to reflect current medical practice.

Model estimates were calculated for specified endocrine therapy with tamoxifen or aromatase inhibitors utilizing the treatment effect hazard ratio from an Early Breast Cancer Trialists’ Collaborative Group meta-analysis.

Patient-specific absolute benefit of chemotherapy was estimated by combining patient-specific meta-analysis risk estimates for distant recurrence and for relative chemotherapy benefit using the B-20 and TAILORx trials.
 

RSClin results and external validation

Among all patients in the meta-analysis cohort, RSClin provided a significantly more accurate prediction of distant recurrence events, in comparison with RS alone or clinical-pathologic factors alone.

External validation was performed using data from real-world outcomes from the 1,098 evaluable node-negative patients in the Clalit Health Services registry, of whom 876 received endocrine therapy alone and 222 received endocrine therapy plus chemotherapy.

RSClin estimates of distant recurrence closely approximated the observed risk in the registry (standardized hazard ratio, 1.73; 95% confidence interval, 1.40-2.15; P < .001). Within each RSClin risk quintile, the average 10-year risk estimate approached the observed Kaplan-Meier estimates in the cohort (Lin concordance correlation = 0.962).
 

Shared decision-making

For many years, the dilemma of whether to recommend adjuvant chemotherapy to a patient with early breast cancer has prompted the generation of tools to quantify a patient’s risk of recurrence and the magnitude of benefit for endocrine therapy and/or chemotherapy.

When the original Adjuvant! Online program was developed, genomic risk profiling was in its infancy. Genomic tools such as the 21-gene RS have subsequently demonstrated that they can help optimize the adjuvant treatment we recommend.

The RSClin tool provides more precise, individualized information than does clinical-pathological or genomic data alone. It prognosticates the risk of distant recurrence of breast cancer, which patients and providers fervently wish to minimize.

RSClin estimates the incremental benefit of contemporary adjuvant chemotherapy over modern endocrine therapy alone, in absolute values, for individual patients. This transparent, discrete, easily explained information is vital for counseling patients.

However, as highlighted in an editorial published in the Journal of Clinical Oncology, RSClin is not without its potential drawbacks. These include:

• Tumor heterogeneity leading to misleading results.
• Variable patient adherence to endocrine therapy or chemotherapy.
• The influence of comorbid conditions on the risk/benefit ratio.
• The potential of ovarian function suppression in young women to approach the magnitude of benefit associated with chemotherapy.

Accordingly, RSClin may be the latest and best available tool, but it will not be the last.

For patients with RS above 26, for older women with intermediate RS, and for younger women with a low RS and low clinical-pathologic features, RSClin may not influence treatment recommendations.

However, for the common scenario of an intermediate-risk RS and a mix of pathologic features, the accurate prognostication for distant recurrence risk and estimate of absolute benefit from chemotherapy will be terrifically helpful to oncology caregivers.

Dr. Sparano disclosed funding from the National Cancer Institute and travel support from Rhenium.
 

Dr. Lyss was a community-based medical oncologist and clinical researcher for more than 35 years before his recent retirement. His clinical and research interests were focused on breast and lung cancers, as well as expanding clinical trial access to medically underserved populations. He is based in St. Louis. He has no conflicts of interest.

A combination of biomarkers identifies patients with luminal early breast cancer who can safely skip chemotherapy after surgery, results from the ADAPT HR+/HER2– trial suggest.

The findings were reported at the 2020 San Antonio Breast Cancer Symposium.

“In early luminal breast cancer, optimal patient selection for omission of adjuvant chemotherapy, particularly in patients with one to three involved lymph nodes, is still unclear,” noted principal investigator Nadia Harbeck, MD, PhD, of the University of Munich.

Successive trials have used nodal status, genomic risk scores, and response to preoperative therapy to home in on subsets of women for whom this practice is safe.

The ADAPT HR+/HER2– trial is a phase 3 trial that enrolled 5,625 patients with luminal (hormone receptor–positive, HER2-negative) early breast cancer who were candidates for adjuvant chemotherapy based on conventional criteria.

The trial combined a static biomarker – Oncotype Dx recurrence score (RS) in the baseline core biopsy – and a dynamic biomarker – Ki-67 response to a 3-week course of preoperative endocrine therapy – to personalize adjuvant therapy.

At SABCS 2020, Dr. Harbeck reported results for 2,290 patients having zero to three involved lymph nodes: 868 patients with RS 0-11 and 1,422 patients with RS 12-25 who had a response to brief preoperative endocrine therapy (a Ki-67 fraction ≤10% at surgery). All were treated with endocrine therapy alone as adjuvant therapy.
 

Similar outcomes

The median follow-up was 60 months. The 5-year rate of invasive disease–free survival was 93.9% for the group with RS 0-11 and 92.6% for the group with RS 12-25 and a response to the preoperative endocrine therapy.

The study met its primary endpoint, as the lower limit of the 95% confidence interval for the difference between groups of –3.3% fell just within the predefined margin of –3.3% or less for noninferiority (P = .05).

The groups also had similarly “excellent” distant disease–free survival (96.3% for RS 0-11 and 95.6% for RS 12-25; P = .247) and overall survival (98.0% for RS 0-11 and 97.3% for RS 12-25; P = .160), Dr. Harbeck reported.

The similar distant disease–free survival was consistent regardless of whether women were younger or older than 50 years and regardless of whether women had involved nodes or not.

In multivariate analysis, women had greater risk of distant disease–free survival events if they had three positive lymph nodes versus zero to two (hazard ratio, 3.40) or a pathologic T stage of 2-4 versus 0-1 (HR, 2.24), whereas risk fell with increasing baseline progesterone receptor expression (HR, 0.92).

“Neither patient age nor study arm were prognostic factors for patient outcome,” Dr. Harbeck noted.

In stratified analysis, the negative impact of having three positive nodes was seen only in the group with RS 12-25 and response to preoperative endocrine therapy, suggesting this subgroup may not be good candidates for omission of chemotherapy, she said.
 

Applying results to practice

“In luminal early breast cancer, the following patients – irrespective of their age – can safely be treated by endocrine therapy alone: patients with zero to three involved lymph nodes and recurrence score 0-11, and those with limited nodal burden (zero to two lymph nodes), recurrence score 12-25, and endocrine response after short preoperative endocrine therapy,” Dr. Harbeck summarized.

“Oncotype Dx testing can spare chemotherapy for the majority of patients with up to three involved lymph nodes. Dynamic Ki-67 response testing is feasible in clinical routine and complements baseline risk assessment to define patient selection for therapy deescalation or escalation,” she added.

The investigators have used the trial’s data to develop an algorithm for predicting the probability of response to short-course preoperative endocrine therapy that is available free of charge online (www.enrep.info).

“This may support everyday clinical decision-making in luminal early breast cancer; for example, whether to start a short period of preoperative endocrine therapy at all, and whether to rely on adjuvant endocrine therapy alone, but also in times like these, whether it’s safe to delay surgery by putting patients on prolonged preoperative endocrine therapy if surgical resources are scarce,” Dr. Harbeck commented.

Her clinic is now recruiting patients for the ADAPT Cycle trial, which is testing an endocrine-based approach with a CDK4/6 inhibitor versus chemotherapy in patients who are not candidates for adjuvant endocrine therapy alone. Therefore, all eligible patients receive the short course of endocrine therapy up front as the standard.

“But if you don’t have a trial, what are you going to do on Monday morning? Please let your patient know whether her tumor is endocrine responsive by doing this 3-week preoperative endocrine therapy,” Dr. Harbeck recommended. “It’s easy to do, you can schedule your surgeries better, and in patients with up to three lymph nodes, it helps with your decision-making, not just in the postmenopausal patients but also in the premenopausal patients, regarding whether they can forgo chemotherapy.”

Findings in context

More than 75% of ADAPT patients with RS 12-25 had a response to short-course endocrine therapy, noted invited discussant Lajos Pusztai, MD, DPhil, of the Yale Cancer Center in New Haven, Conn.

“This implies that the endocrine challenge is not informative for most patients,” he said, adding that a related question is whether the 25% of patients who did not have a response and were therefore given chemotherapy benefited from that therapy.

Dr. Pusztai cautioned that, among patients in the group with RS 12-25 who had a response to preoperative endocrine therapy, certain subgroups were fairly or very small: those aged 50 years or younger (330 patients) and those with two or three positive nodes (75 and 22 patients, respectively).

And collective findings of the similar but much larger TAILORx trial and RxPONDER trial (also reported at SABCS 2020) do suggest a benefit of chemotherapy in younger women, regardless of the number of positive nodes.

“Selection of [estrogen receptor]–positive patients with zero to three lymph nodes for adjuvant chemotherapy currently should be based on age and baseline recurrence score or a similar validated molecular assay,” Dr. Pusztai recommended. “TAILORx results guide us in regard to the use of the recurrence score in node-negative patients with a recurrence score of less than 26, and the recently presented RxPONDER results provide evidence for the use of recurrence score in patients with one to three positive nodes with a recurrence score in the range of 0-26. Both of these trials showed benefit in younger women from adjuvant chemotherapy.”

The ADAPT trial was sponsored by Roche, Genomic Health/Exact Sciences, Celgene, Bayer, Teva, and Amgen. Dr. Harbeck disclosed relationships with Agendia, Amgen, AstraZeneca, Bristol-Myers Squibb, Celgene, Daiichi Sankyo, Lilly, Merck, Novartis, Odonate Therapeutics, Pfizer, Pierre Fabre, Roche/Genentech, Samsung, Sandoz, and Seattle Genetics. Dr. Pusztai disclosed relationships with AstraZeneca, Athenex, Almac, Bristol-Myers Squibb, Biotheranostics, Clovis, Daiichi, Eisai, Genentech, H2Bio, H3 Biomedicine, Immunomedics, Merck, Novartis, Pfizer, Pieris, Radius Health, Syndax, and Seattle Genetics,.

A combination of biomarkers identifies patients with luminal early breast cancer who can safely skip chemotherapy after surgery, results from the ADAPT HR+/HER2– trial suggest.

The findings were reported at the 2020 San Antonio Breast Cancer Symposium.

“In early luminal breast cancer, optimal patient selection for omission of adjuvant chemotherapy, particularly in patients with one to three involved lymph nodes, is still unclear,” noted principal investigator Nadia Harbeck, MD, PhD, of the University of Munich.

Successive trials have used nodal status, genomic risk scores, and response to preoperative therapy to home in on subsets of women for whom this practice is safe.

The ADAPT HR+/HER2– trial is a phase 3 trial that enrolled 5,625 patients with luminal (hormone receptor–positive, HER2-negative) early breast cancer who were candidates for adjuvant chemotherapy based on conventional criteria.

The trial combined a static biomarker – Oncotype Dx recurrence score (RS) in the baseline core biopsy – and a dynamic biomarker – Ki-67 response to a 3-week course of preoperative endocrine therapy – to personalize adjuvant therapy.

At SABCS 2020, Dr. Harbeck reported results for 2,290 patients having zero to three involved lymph nodes: 868 patients with RS 0-11 and 1,422 patients with RS 12-25 who had a response to brief preoperative endocrine therapy (a Ki-67 fraction ≤10% at surgery). All were treated with endocrine therapy alone as adjuvant therapy.
 

Similar outcomes

The median follow-up was 60 months. The 5-year rate of invasive disease–free survival was 93.9% for the group with RS 0-11 and 92.6% for the group with RS 12-25 and a response to the preoperative endocrine therapy.

The study met its primary endpoint, as the lower limit of the 95% confidence interval for the difference between groups of –3.3% fell just within the predefined margin of –3.3% or less for noninferiority (P = .05).

The groups also had similarly “excellent” distant disease–free survival (96.3% for RS 0-11 and 95.6% for RS 12-25; P = .247) and overall survival (98.0% for RS 0-11 and 97.3% for RS 12-25; P = .160), Dr. Harbeck reported.

The similar distant disease–free survival was consistent regardless of whether women were younger or older than 50 years and regardless of whether women had involved nodes or not.

In multivariate analysis, women had greater risk of distant disease–free survival events if they had three positive lymph nodes versus zero to two (hazard ratio, 3.40) or a pathologic T stage of 2-4 versus 0-1 (HR, 2.24), whereas risk fell with increasing baseline progesterone receptor expression (HR, 0.92).

“Neither patient age nor study arm were prognostic factors for patient outcome,” Dr. Harbeck noted.

In stratified analysis, the negative impact of having three positive nodes was seen only in the group with RS 12-25 and response to preoperative endocrine therapy, suggesting this subgroup may not be good candidates for omission of chemotherapy, she said.
 

Applying results to practice

“In luminal early breast cancer, the following patients – irrespective of their age – can safely be treated by endocrine therapy alone: patients with zero to three involved lymph nodes and recurrence score 0-11, and those with limited nodal burden (zero to two lymph nodes), recurrence score 12-25, and endocrine response after short preoperative endocrine therapy,” Dr. Harbeck summarized.

“Oncotype Dx testing can spare chemotherapy for the majority of patients with up to three involved lymph nodes. Dynamic Ki-67 response testing is feasible in clinical routine and complements baseline risk assessment to define patient selection for therapy deescalation or escalation,” she added.

The investigators have used the trial’s data to develop an algorithm for predicting the probability of response to short-course preoperative endocrine therapy that is available free of charge online (www.enrep.info).

“This may support everyday clinical decision-making in luminal early breast cancer; for example, whether to start a short period of preoperative endocrine therapy at all, and whether to rely on adjuvant endocrine therapy alone, but also in times like these, whether it’s safe to delay surgery by putting patients on prolonged preoperative endocrine therapy if surgical resources are scarce,” Dr. Harbeck commented.

Her clinic is now recruiting patients for the ADAPT Cycle trial, which is testing an endocrine-based approach with a CDK4/6 inhibitor versus chemotherapy in patients who are not candidates for adjuvant endocrine therapy alone. Therefore, all eligible patients receive the short course of endocrine therapy up front as the standard.

“But if you don’t have a trial, what are you going to do on Monday morning? Please let your patient know whether her tumor is endocrine responsive by doing this 3-week preoperative endocrine therapy,” Dr. Harbeck recommended. “It’s easy to do, you can schedule your surgeries better, and in patients with up to three lymph nodes, it helps with your decision-making, not just in the postmenopausal patients but also in the premenopausal patients, regarding whether they can forgo chemotherapy.”

Findings in context

More than 75% of ADAPT patients with RS 12-25 had a response to short-course endocrine therapy, noted invited discussant Lajos Pusztai, MD, DPhil, of the Yale Cancer Center in New Haven, Conn.

“This implies that the endocrine challenge is not informative for most patients,” he said, adding that a related question is whether the 25% of patients who did not have a response and were therefore given chemotherapy benefited from that therapy.

Dr. Pusztai cautioned that, among patients in the group with RS 12-25 who had a response to preoperative endocrine therapy, certain subgroups were fairly or very small: those aged 50 years or younger (330 patients) and those with two or three positive nodes (75 and 22 patients, respectively).

And collective findings of the similar but much larger TAILORx trial and RxPONDER trial (also reported at SABCS 2020) do suggest a benefit of chemotherapy in younger women, regardless of the number of positive nodes.

“Selection of [estrogen receptor]–positive patients with zero to three lymph nodes for adjuvant chemotherapy currently should be based on age and baseline recurrence score or a similar validated molecular assay,” Dr. Pusztai recommended. “TAILORx results guide us in regard to the use of the recurrence score in node-negative patients with a recurrence score of less than 26, and the recently presented RxPONDER results provide evidence for the use of recurrence score in patients with one to three positive nodes with a recurrence score in the range of 0-26. Both of these trials showed benefit in younger women from adjuvant chemotherapy.”

The ADAPT trial was sponsored by Roche, Genomic Health/Exact Sciences, Celgene, Bayer, Teva, and Amgen. Dr. Harbeck disclosed relationships with Agendia, Amgen, AstraZeneca, Bristol-Myers Squibb, Celgene, Daiichi Sankyo, Lilly, Merck, Novartis, Odonate Therapeutics, Pfizer, Pierre Fabre, Roche/Genentech, Samsung, Sandoz, and Seattle Genetics. Dr. Pusztai disclosed relationships with AstraZeneca, Athenex, Almac, Bristol-Myers Squibb, Biotheranostics, Clovis, Daiichi, Eisai, Genentech, H2Bio, H3 Biomedicine, Immunomedics, Merck, Novartis, Pfizer, Pieris, Radius Health, Syndax, and Seattle Genetics,.

A combination of biomarkers identifies patients with luminal early breast cancer who can safely skip chemotherapy after surgery, results from the ADAPT HR+/HER2– trial suggest.

The findings were reported at the 2020 San Antonio Breast Cancer Symposium.

“In early luminal breast cancer, optimal patient selection for omission of adjuvant chemotherapy, particularly in patients with one to three involved lymph nodes, is still unclear,” noted principal investigator Nadia Harbeck, MD, PhD, of the University of Munich.

Successive trials have used nodal status, genomic risk scores, and response to preoperative therapy to home in on subsets of women for whom this practice is safe.

The ADAPT HR+/HER2– trial is a phase 3 trial that enrolled 5,625 patients with luminal (hormone receptor–positive, HER2-negative) early breast cancer who were candidates for adjuvant chemotherapy based on conventional criteria.

The trial combined a static biomarker – Oncotype Dx recurrence score (RS) in the baseline core biopsy – and a dynamic biomarker – Ki-67 response to a 3-week course of preoperative endocrine therapy – to personalize adjuvant therapy.

At SABCS 2020, Dr. Harbeck reported results for 2,290 patients having zero to three involved lymph nodes: 868 patients with RS 0-11 and 1,422 patients with RS 12-25 who had a response to brief preoperative endocrine therapy (a Ki-67 fraction ≤10% at surgery). All were treated with endocrine therapy alone as adjuvant therapy.
 

Similar outcomes

The median follow-up was 60 months. The 5-year rate of invasive disease–free survival was 93.9% for the group with RS 0-11 and 92.6% for the group with RS 12-25 and a response to the preoperative endocrine therapy.

The study met its primary endpoint, as the lower limit of the 95% confidence interval for the difference between groups of –3.3% fell just within the predefined margin of –3.3% or less for noninferiority (P = .05).

The groups also had similarly “excellent” distant disease–free survival (96.3% for RS 0-11 and 95.6% for RS 12-25; P = .247) and overall survival (98.0% for RS 0-11 and 97.3% for RS 12-25; P = .160), Dr. Harbeck reported.

The similar distant disease–free survival was consistent regardless of whether women were younger or older than 50 years and regardless of whether women had involved nodes or not.

In multivariate analysis, women had greater risk of distant disease–free survival events if they had three positive lymph nodes versus zero to two (hazard ratio, 3.40) or a pathologic T stage of 2-4 versus 0-1 (HR, 2.24), whereas risk fell with increasing baseline progesterone receptor expression (HR, 0.92).

“Neither patient age nor study arm were prognostic factors for patient outcome,” Dr. Harbeck noted.

In stratified analysis, the negative impact of having three positive nodes was seen only in the group with RS 12-25 and response to preoperative endocrine therapy, suggesting this subgroup may not be good candidates for omission of chemotherapy, she said.
 

Applying results to practice

“In luminal early breast cancer, the following patients – irrespective of their age – can safely be treated by endocrine therapy alone: patients with zero to three involved lymph nodes and recurrence score 0-11, and those with limited nodal burden (zero to two lymph nodes), recurrence score 12-25, and endocrine response after short preoperative endocrine therapy,” Dr. Harbeck summarized.

“Oncotype Dx testing can spare chemotherapy for the majority of patients with up to three involved lymph nodes. Dynamic Ki-67 response testing is feasible in clinical routine and complements baseline risk assessment to define patient selection for therapy deescalation or escalation,” she added.

The investigators have used the trial’s data to develop an algorithm for predicting the probability of response to short-course preoperative endocrine therapy that is available free of charge online (www.enrep.info).

“This may support everyday clinical decision-making in luminal early breast cancer; for example, whether to start a short period of preoperative endocrine therapy at all, and whether to rely on adjuvant endocrine therapy alone, but also in times like these, whether it’s safe to delay surgery by putting patients on prolonged preoperative endocrine therapy if surgical resources are scarce,” Dr. Harbeck commented.

Her clinic is now recruiting patients for the ADAPT Cycle trial, which is testing an endocrine-based approach with a CDK4/6 inhibitor versus chemotherapy in patients who are not candidates for adjuvant endocrine therapy alone. Therefore, all eligible patients receive the short course of endocrine therapy up front as the standard.

“But if you don’t have a trial, what are you going to do on Monday morning? Please let your patient know whether her tumor is endocrine responsive by doing this 3-week preoperative endocrine therapy,” Dr. Harbeck recommended. “It’s easy to do, you can schedule your surgeries better, and in patients with up to three lymph nodes, it helps with your decision-making, not just in the postmenopausal patients but also in the premenopausal patients, regarding whether they can forgo chemotherapy.”

Findings in context

More than 75% of ADAPT patients with RS 12-25 had a response to short-course endocrine therapy, noted invited discussant Lajos Pusztai, MD, DPhil, of the Yale Cancer Center in New Haven, Conn.

“This implies that the endocrine challenge is not informative for most patients,” he said, adding that a related question is whether the 25% of patients who did not have a response and were therefore given chemotherapy benefited from that therapy.

Dr. Pusztai cautioned that, among patients in the group with RS 12-25 who had a response to preoperative endocrine therapy, certain subgroups were fairly or very small: those aged 50 years or younger (330 patients) and those with two or three positive nodes (75 and 22 patients, respectively).

And collective findings of the similar but much larger TAILORx trial and RxPONDER trial (also reported at SABCS 2020) do suggest a benefit of chemotherapy in younger women, regardless of the number of positive nodes.

“Selection of [estrogen receptor]–positive patients with zero to three lymph nodes for adjuvant chemotherapy currently should be based on age and baseline recurrence score or a similar validated molecular assay,” Dr. Pusztai recommended. “TAILORx results guide us in regard to the use of the recurrence score in node-negative patients with a recurrence score of less than 26, and the recently presented RxPONDER results provide evidence for the use of recurrence score in patients with one to three positive nodes with a recurrence score in the range of 0-26. Both of these trials showed benefit in younger women from adjuvant chemotherapy.”

The ADAPT trial was sponsored by Roche, Genomic Health/Exact Sciences, Celgene, Bayer, Teva, and Amgen. Dr. Harbeck disclosed relationships with Agendia, Amgen, AstraZeneca, Bristol-Myers Squibb, Celgene, Daiichi Sankyo, Lilly, Merck, Novartis, Odonate Therapeutics, Pfizer, Pierre Fabre, Roche/Genentech, Samsung, Sandoz, and Seattle Genetics. Dr. Pusztai disclosed relationships with AstraZeneca, Athenex, Almac, Bristol-Myers Squibb, Biotheranostics, Clovis, Daiichi, Eisai, Genentech, H2Bio, H3 Biomedicine, Immunomedics, Merck, Novartis, Pfizer, Pieris, Radius Health, Syndax, and Seattle Genetics,.