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MRI screening cost effective for women with dense breasts
Alternatively, if a woman worries that the 4-year screening interval is too long, screening mammography may be offered every 2 years, with MRI screening offered for the second 2-year interval, according to the findings. This strategy would still require the patient to undergo MRI breast cancer screening every 4 years.
“MRI is more effective not only for selected patients. It is actually more effective than mammography for all women,” editorialist Christiane Kuhl, MD, PhD, University of Aachen (Germany), said in an interview.
“But the superior diagnostic accuracy of MRI is more often needed for women who are at higher risk for breast cancer, and therefore the cost-effectiveness is easier to achieve in women who are at higher risk,” she added.
The study was published online Sept. 29 in the Journal of the National Cancer Institute.
DENSE trial
The simulation model used for the study was based on results from the Dense Tissue and Early Breast Neoplasm Screening (DENSE) trial, which showed that additional MRI screening for women with extremely dense breast tissue led to significantly fewer interval cancers in comparison with mammography alone (P < .001). In the DENSE trial, MRI participants underwent mammography plus MRI at 2-year intervals; the control group underwent mammography alone at 2-year intervals.
In the current study, “screening strategies varied in the number of MRIs and mammograms offered to women aged 50-75 years,” explains Amarens Geuzinge, MSc, University Medical Center, Rotterdam, the Netherlands, and colleagues, “and incremental cost-effectiveness ratios (ICERs) were calculated ... with a willingness-to-pay threshold of 22,000 euros (>$25,000 U.S.),” the investigators add.
Analyses indicated that screening every 2 years with mammography alone cost the least of all strategies that were evaluated, but it also resulted in the lowest number of quality-adjusted life years (QALYs) – in other words, it delivered the least amount of benefit for patients, coauthor Eveline Heijnsdijk, PhD, University Medical Center, Rotterdam, the Netherlands, explained to this news organization.
Offering an additional MRI every 2 years resulted in the highest costs but not the highest number of QALYs and was inferior to the other screening strategies analyzed, she added. Alternating mammography with MRI breast cancer screening, each conducted every 2 years, came close to providing the same benefits to patients as the every-4-year MRI screening strategy, Dr. Heijnsdijk noted.
However, when the authors applied the National Institute for Health and Care Excellence (NICE) threshold, MRI screening every 4 years yielded the highest acceptable incremental cost-effectiveness ratio (ICER), at 15,620 euros per QALYs, whereas screening every 3 years with MRI alone yielded an ICER of 37,181 euros per QALY.
If decision-makers are willing to pay more than 22,000 euros per QALY gained, “MRI every 2 or 3 years can also become cost effective,” the authors add.
Asked how acceptable MRI screening might be if performed only once every 4 years, Dr. Heijnsdijk noted that, in another of their studies, most of the women who had undergone MRI screening for breast cancer said that they would do so again. “MRI is not a pleasant test, but mammography is also not a pleasant test,” she said.
“So many women prefer MRI above mammography, especially because the detection rate with MRI is better than mammography,” she noted. Dr. Heijnsdijk also said that the percentage of women with extremely dense breasts who would be candidates for MRI screening is small – no more than 10% of women.
At a unit cost of slightly under 300 euros for MRI screening – compared with about 100 euros for screening mammography in the Netherlands – the cost of offering 10% of women MRI instead of mammography might increase, but any additional screening costs could be offset by reductions in the need to treat late-stage breast cancer more aggressively.
‘Interval’ cancers
Commenting further on the study, Dr. Kuhl pointed out that from 25% to 45% of cancers that occur in women who have undergone screening mammography are diagnosed as “interval” cancers, even among women who participate in the best mammography programs. “For a long time, people argued that these interval cancers developed only after the last respective mammogram, but that’s not true at all, because we know that with MRI screening, we can reduce the interval cancer rate down to zero,” Dr. Kuhl emphasized.
This is partially explained by the fact that mammography is “particularly blind” when it comes to detecting rapidly growing tumors. “The fact is that mammography has a modality-inherent tendency to preferentially detect slow-growing cancers, whereas rapidly growing tumors are indistinguishable from ubiquitous benign changes like cysts. [This] is why women who undergo screening mammography are frequently not diagnosed with the cancers that we really need to find,” she said.
Although there is ample talk about overdiagnosis when it comes to screening mammography, the overwhelmingly important problem is underdiagnosis. Even in exemplary mammography screening programs, at least 20% of tumors that are diagnosed on mammography have already advanced to a stage that is too late, Dr. Kuhl noted.
This means that at least half of women do not benefit from screening mammography nearly to the extent that they – and their health care practitioners – believe they should, she added. Dr. Kuhl underscored that this does not mean that clinicians should abandon screening mammography.
What it does mean is that physicians need to abandon the one-size-fits-all approach to screening mammography and start stratifying women on the basis of their individual risk of developing breast cancer by taking a family or personal history. Most women do undergo screening mammography at least once, Dr. Kuhl pointed out. From that mammogram, physicians can use information on breast density and breast architecture to better determine individual risk.
“We have good ideas about how to achieve risk stratification, but we’re not using them, because as long as mammography is the answer for everybody, there isn’t much motivation to dig deeper into the issue of how to determine risk,” Dr. Kuhl said.
“But we have to ensure the early diagnosis of aggressive cancers, and it’s exactly MRI that can do this, and we should start with women with very dense breasts because they are doubly underserved by mammography,” she said.
The study was supported by the University Medical Center Utrecht, Bayer HealthCare Medical Care, Matakina, and others. Ms. Geuzinge, Dr. Heijnsdijk, and Dr. Kuhl have disclosed no relevant financial relationships.
A version of this article first appeared on Medscape.com.
Alternatively, if a woman worries that the 4-year screening interval is too long, screening mammography may be offered every 2 years, with MRI screening offered for the second 2-year interval, according to the findings. This strategy would still require the patient to undergo MRI breast cancer screening every 4 years.
“MRI is more effective not only for selected patients. It is actually more effective than mammography for all women,” editorialist Christiane Kuhl, MD, PhD, University of Aachen (Germany), said in an interview.
“But the superior diagnostic accuracy of MRI is more often needed for women who are at higher risk for breast cancer, and therefore the cost-effectiveness is easier to achieve in women who are at higher risk,” she added.
The study was published online Sept. 29 in the Journal of the National Cancer Institute.
DENSE trial
The simulation model used for the study was based on results from the Dense Tissue and Early Breast Neoplasm Screening (DENSE) trial, which showed that additional MRI screening for women with extremely dense breast tissue led to significantly fewer interval cancers in comparison with mammography alone (P < .001). In the DENSE trial, MRI participants underwent mammography plus MRI at 2-year intervals; the control group underwent mammography alone at 2-year intervals.
In the current study, “screening strategies varied in the number of MRIs and mammograms offered to women aged 50-75 years,” explains Amarens Geuzinge, MSc, University Medical Center, Rotterdam, the Netherlands, and colleagues, “and incremental cost-effectiveness ratios (ICERs) were calculated ... with a willingness-to-pay threshold of 22,000 euros (>$25,000 U.S.),” the investigators add.
Analyses indicated that screening every 2 years with mammography alone cost the least of all strategies that were evaluated, but it also resulted in the lowest number of quality-adjusted life years (QALYs) – in other words, it delivered the least amount of benefit for patients, coauthor Eveline Heijnsdijk, PhD, University Medical Center, Rotterdam, the Netherlands, explained to this news organization.
Offering an additional MRI every 2 years resulted in the highest costs but not the highest number of QALYs and was inferior to the other screening strategies analyzed, she added. Alternating mammography with MRI breast cancer screening, each conducted every 2 years, came close to providing the same benefits to patients as the every-4-year MRI screening strategy, Dr. Heijnsdijk noted.
However, when the authors applied the National Institute for Health and Care Excellence (NICE) threshold, MRI screening every 4 years yielded the highest acceptable incremental cost-effectiveness ratio (ICER), at 15,620 euros per QALYs, whereas screening every 3 years with MRI alone yielded an ICER of 37,181 euros per QALY.
If decision-makers are willing to pay more than 22,000 euros per QALY gained, “MRI every 2 or 3 years can also become cost effective,” the authors add.
Asked how acceptable MRI screening might be if performed only once every 4 years, Dr. Heijnsdijk noted that, in another of their studies, most of the women who had undergone MRI screening for breast cancer said that they would do so again. “MRI is not a pleasant test, but mammography is also not a pleasant test,” she said.
“So many women prefer MRI above mammography, especially because the detection rate with MRI is better than mammography,” she noted. Dr. Heijnsdijk also said that the percentage of women with extremely dense breasts who would be candidates for MRI screening is small – no more than 10% of women.
At a unit cost of slightly under 300 euros for MRI screening – compared with about 100 euros for screening mammography in the Netherlands – the cost of offering 10% of women MRI instead of mammography might increase, but any additional screening costs could be offset by reductions in the need to treat late-stage breast cancer more aggressively.
‘Interval’ cancers
Commenting further on the study, Dr. Kuhl pointed out that from 25% to 45% of cancers that occur in women who have undergone screening mammography are diagnosed as “interval” cancers, even among women who participate in the best mammography programs. “For a long time, people argued that these interval cancers developed only after the last respective mammogram, but that’s not true at all, because we know that with MRI screening, we can reduce the interval cancer rate down to zero,” Dr. Kuhl emphasized.
This is partially explained by the fact that mammography is “particularly blind” when it comes to detecting rapidly growing tumors. “The fact is that mammography has a modality-inherent tendency to preferentially detect slow-growing cancers, whereas rapidly growing tumors are indistinguishable from ubiquitous benign changes like cysts. [This] is why women who undergo screening mammography are frequently not diagnosed with the cancers that we really need to find,” she said.
Although there is ample talk about overdiagnosis when it comes to screening mammography, the overwhelmingly important problem is underdiagnosis. Even in exemplary mammography screening programs, at least 20% of tumors that are diagnosed on mammography have already advanced to a stage that is too late, Dr. Kuhl noted.
This means that at least half of women do not benefit from screening mammography nearly to the extent that they – and their health care practitioners – believe they should, she added. Dr. Kuhl underscored that this does not mean that clinicians should abandon screening mammography.
What it does mean is that physicians need to abandon the one-size-fits-all approach to screening mammography and start stratifying women on the basis of their individual risk of developing breast cancer by taking a family or personal history. Most women do undergo screening mammography at least once, Dr. Kuhl pointed out. From that mammogram, physicians can use information on breast density and breast architecture to better determine individual risk.
“We have good ideas about how to achieve risk stratification, but we’re not using them, because as long as mammography is the answer for everybody, there isn’t much motivation to dig deeper into the issue of how to determine risk,” Dr. Kuhl said.
“But we have to ensure the early diagnosis of aggressive cancers, and it’s exactly MRI that can do this, and we should start with women with very dense breasts because they are doubly underserved by mammography,” she said.
The study was supported by the University Medical Center Utrecht, Bayer HealthCare Medical Care, Matakina, and others. Ms. Geuzinge, Dr. Heijnsdijk, and Dr. Kuhl have disclosed no relevant financial relationships.
A version of this article first appeared on Medscape.com.
Alternatively, if a woman worries that the 4-year screening interval is too long, screening mammography may be offered every 2 years, with MRI screening offered for the second 2-year interval, according to the findings. This strategy would still require the patient to undergo MRI breast cancer screening every 4 years.
“MRI is more effective not only for selected patients. It is actually more effective than mammography for all women,” editorialist Christiane Kuhl, MD, PhD, University of Aachen (Germany), said in an interview.
“But the superior diagnostic accuracy of MRI is more often needed for women who are at higher risk for breast cancer, and therefore the cost-effectiveness is easier to achieve in women who are at higher risk,” she added.
The study was published online Sept. 29 in the Journal of the National Cancer Institute.
DENSE trial
The simulation model used for the study was based on results from the Dense Tissue and Early Breast Neoplasm Screening (DENSE) trial, which showed that additional MRI screening for women with extremely dense breast tissue led to significantly fewer interval cancers in comparison with mammography alone (P < .001). In the DENSE trial, MRI participants underwent mammography plus MRI at 2-year intervals; the control group underwent mammography alone at 2-year intervals.
In the current study, “screening strategies varied in the number of MRIs and mammograms offered to women aged 50-75 years,” explains Amarens Geuzinge, MSc, University Medical Center, Rotterdam, the Netherlands, and colleagues, “and incremental cost-effectiveness ratios (ICERs) were calculated ... with a willingness-to-pay threshold of 22,000 euros (>$25,000 U.S.),” the investigators add.
Analyses indicated that screening every 2 years with mammography alone cost the least of all strategies that were evaluated, but it also resulted in the lowest number of quality-adjusted life years (QALYs) – in other words, it delivered the least amount of benefit for patients, coauthor Eveline Heijnsdijk, PhD, University Medical Center, Rotterdam, the Netherlands, explained to this news organization.
Offering an additional MRI every 2 years resulted in the highest costs but not the highest number of QALYs and was inferior to the other screening strategies analyzed, she added. Alternating mammography with MRI breast cancer screening, each conducted every 2 years, came close to providing the same benefits to patients as the every-4-year MRI screening strategy, Dr. Heijnsdijk noted.
However, when the authors applied the National Institute for Health and Care Excellence (NICE) threshold, MRI screening every 4 years yielded the highest acceptable incremental cost-effectiveness ratio (ICER), at 15,620 euros per QALYs, whereas screening every 3 years with MRI alone yielded an ICER of 37,181 euros per QALY.
If decision-makers are willing to pay more than 22,000 euros per QALY gained, “MRI every 2 or 3 years can also become cost effective,” the authors add.
Asked how acceptable MRI screening might be if performed only once every 4 years, Dr. Heijnsdijk noted that, in another of their studies, most of the women who had undergone MRI screening for breast cancer said that they would do so again. “MRI is not a pleasant test, but mammography is also not a pleasant test,” she said.
“So many women prefer MRI above mammography, especially because the detection rate with MRI is better than mammography,” she noted. Dr. Heijnsdijk also said that the percentage of women with extremely dense breasts who would be candidates for MRI screening is small – no more than 10% of women.
At a unit cost of slightly under 300 euros for MRI screening – compared with about 100 euros for screening mammography in the Netherlands – the cost of offering 10% of women MRI instead of mammography might increase, but any additional screening costs could be offset by reductions in the need to treat late-stage breast cancer more aggressively.
‘Interval’ cancers
Commenting further on the study, Dr. Kuhl pointed out that from 25% to 45% of cancers that occur in women who have undergone screening mammography are diagnosed as “interval” cancers, even among women who participate in the best mammography programs. “For a long time, people argued that these interval cancers developed only after the last respective mammogram, but that’s not true at all, because we know that with MRI screening, we can reduce the interval cancer rate down to zero,” Dr. Kuhl emphasized.
This is partially explained by the fact that mammography is “particularly blind” when it comes to detecting rapidly growing tumors. “The fact is that mammography has a modality-inherent tendency to preferentially detect slow-growing cancers, whereas rapidly growing tumors are indistinguishable from ubiquitous benign changes like cysts. [This] is why women who undergo screening mammography are frequently not diagnosed with the cancers that we really need to find,” she said.
Although there is ample talk about overdiagnosis when it comes to screening mammography, the overwhelmingly important problem is underdiagnosis. Even in exemplary mammography screening programs, at least 20% of tumors that are diagnosed on mammography have already advanced to a stage that is too late, Dr. Kuhl noted.
This means that at least half of women do not benefit from screening mammography nearly to the extent that they – and their health care practitioners – believe they should, she added. Dr. Kuhl underscored that this does not mean that clinicians should abandon screening mammography.
What it does mean is that physicians need to abandon the one-size-fits-all approach to screening mammography and start stratifying women on the basis of their individual risk of developing breast cancer by taking a family or personal history. Most women do undergo screening mammography at least once, Dr. Kuhl pointed out. From that mammogram, physicians can use information on breast density and breast architecture to better determine individual risk.
“We have good ideas about how to achieve risk stratification, but we’re not using them, because as long as mammography is the answer for everybody, there isn’t much motivation to dig deeper into the issue of how to determine risk,” Dr. Kuhl said.
“But we have to ensure the early diagnosis of aggressive cancers, and it’s exactly MRI that can do this, and we should start with women with very dense breasts because they are doubly underserved by mammography,” she said.
The study was supported by the University Medical Center Utrecht, Bayer HealthCare Medical Care, Matakina, and others. Ms. Geuzinge, Dr. Heijnsdijk, and Dr. Kuhl have disclosed no relevant financial relationships.
A version of this article first appeared on Medscape.com.
Many patients, doctors unaware of advancements in cancer care
This is the main finding from two studies presented at the 2021 European Society for Medical Oncology Congress.
The survey of patients found that most don’t understand how immunotherapy works, and the survey of doctors found that many working outside of the cancer field are using information on survival that is wildly out of date.
When a patient is first told they have cancer, counseling is usually done by a surgeon or general medical doctor and not an oncologist, said Conleth Murphy, MD, of Bon Secours Hospital Cork, Ireland, and coauthor of the second study.
Noncancer doctors often grossly underestimate patients’ chances of survival, Dr. Murphy’s study found. This suggests that doctors who practice outside of cancer care may be working with the same information they learned in medical school, he said.
“These patients must be spared the traumatic effects of being handed a death sentence that no longer reflects the current reality,” Dr. Murphy said.
After receiving a diagnosis of cancer, “patients often immediately have pressing questions about what it means for their future,” he noted. A common question is: “How long do I have left?”
Nononcologists should refrain from answering patients’ questions with numbers, Dr. Murphy said.
Family doctors are likely to be influenced by the experience they have had with specific cancer patients in their practice, said Cyril Bonin, MD, a general practitioner in Usson-du-Poitou, France, who has 900 patients in his practice.
He sees about 10 patients with a new diagnosis of cancer each year. In addition, about 50 of his patients are in active treatment for cancer or have finished treatment and are considered cancer survivors.
“It is not entirely realistic for us to expect practitioners who deal with hundreds of different diseases to keep up with every facet of a rapidly changing oncology landscape,” said Marco Donia, MD, an expert in immunotherapy from the University of Copenhagen.
That landscape has changed dramatically in recent years, particularly since immunotherapy was added to the arsenal. Immunotherapy is a way to fine-tune your immune system to fight cancer.
For example, in the past, patients with metastatic melanoma would have an average survival of about 1 year. But now, some patients who have responded to immunotherapy are still alive 10 years later.
Findings from the patient survey
It is important that patients stay well informed because immunotherapy is a “complex treatment that is too often mistaken for a miracle cure,” said Paris Kosmidis, MD, the co-author of the patient survey.
“The more patients know about it, the better the communication with their medical team and thus the better their outcomes are likely to be,” said Dr. Kosmidis, who is co-founder and chief medical officer of CareAcross, an online service that provides personalized education for cancer patients
The survey was of 5,589 patients with cancer who were recruited from CareAcross clients from the United Kingdom, France, Italy, Spain, and Germany.
The survey asked them about how immunotherapy works, what it costs, and its side effects.
Almost half responded “not sure/do not know,” but about a third correctly answered that immunotherapy “activates the immune system to kill cancer cells.”
Similarly, more than half thought that immunotherapy started working right away, while only 20% correctly answered that it takes several weeks to become effective.
“This is important because patients need to start their therapy with realistic expectations, for example to avoid disappointment when their symptoms take some time to disappear,” Dr. Kosmidis said.
A small group of 24 patients with lung cancer who had been treated with immunotherapy got many correct answers, but they overestimated the intensity of side effects, compared with other therapies.
“Well-informed patients who know what to expect can do 90% of the job of preventing side effects from becoming severe by having them treated early,” said Dr. Donia, of the University of Copenhagen.
Most cancer patients were also unaware of the cost of immunotherapy, which can exceed $100,000 a year, Dr. Kosmidis said.
Results of the doctor survey
The other survey presented at the meeting looked at how much doctors know about survival for 12 of the most common cancers.
Dr. Murphy and colleagues asked 301 noncancer doctors and 46 cancer specialists to estimate the percentage of patients who could be expected to live for 5 years after diagnosis (a measure known as the 5-year survival rate).
Answers from the two groups were compared and graded according to cancer survival statistics from the National Cancer Registry of Ireland.
Both groups of doctors had a hard time estimating the survival of common cancers.
Nononcologists accurately predicted 5-year survival for just two of the cancer types, while the cancer specialists got it right for four cancer types.
However, the noncancer doctors had a more pessimistic outlook on cancer survival generally and severely underestimated the chances of survival in specific cancers, particularly stage IV breast cancer. The survival for this cancer has “evolved considerably over time and now reaches 40% in Ireland,” Dr. Murphy pointed out.
“These results are in line with what we had expected because most physicians’ knowledge of oncology dates back to whatever education they received during their years of training, so their perceptions of cancer prognosis are likely to lag behind the major survival gains achieved in the recent past,” Dr. Murphy said.
A version of this article first appeared on Medscape.com.
This is the main finding from two studies presented at the 2021 European Society for Medical Oncology Congress.
The survey of patients found that most don’t understand how immunotherapy works, and the survey of doctors found that many working outside of the cancer field are using information on survival that is wildly out of date.
When a patient is first told they have cancer, counseling is usually done by a surgeon or general medical doctor and not an oncologist, said Conleth Murphy, MD, of Bon Secours Hospital Cork, Ireland, and coauthor of the second study.
Noncancer doctors often grossly underestimate patients’ chances of survival, Dr. Murphy’s study found. This suggests that doctors who practice outside of cancer care may be working with the same information they learned in medical school, he said.
“These patients must be spared the traumatic effects of being handed a death sentence that no longer reflects the current reality,” Dr. Murphy said.
After receiving a diagnosis of cancer, “patients often immediately have pressing questions about what it means for their future,” he noted. A common question is: “How long do I have left?”
Nononcologists should refrain from answering patients’ questions with numbers, Dr. Murphy said.
Family doctors are likely to be influenced by the experience they have had with specific cancer patients in their practice, said Cyril Bonin, MD, a general practitioner in Usson-du-Poitou, France, who has 900 patients in his practice.
He sees about 10 patients with a new diagnosis of cancer each year. In addition, about 50 of his patients are in active treatment for cancer or have finished treatment and are considered cancer survivors.
“It is not entirely realistic for us to expect practitioners who deal with hundreds of different diseases to keep up with every facet of a rapidly changing oncology landscape,” said Marco Donia, MD, an expert in immunotherapy from the University of Copenhagen.
That landscape has changed dramatically in recent years, particularly since immunotherapy was added to the arsenal. Immunotherapy is a way to fine-tune your immune system to fight cancer.
For example, in the past, patients with metastatic melanoma would have an average survival of about 1 year. But now, some patients who have responded to immunotherapy are still alive 10 years later.
Findings from the patient survey
It is important that patients stay well informed because immunotherapy is a “complex treatment that is too often mistaken for a miracle cure,” said Paris Kosmidis, MD, the co-author of the patient survey.
“The more patients know about it, the better the communication with their medical team and thus the better their outcomes are likely to be,” said Dr. Kosmidis, who is co-founder and chief medical officer of CareAcross, an online service that provides personalized education for cancer patients
The survey was of 5,589 patients with cancer who were recruited from CareAcross clients from the United Kingdom, France, Italy, Spain, and Germany.
The survey asked them about how immunotherapy works, what it costs, and its side effects.
Almost half responded “not sure/do not know,” but about a third correctly answered that immunotherapy “activates the immune system to kill cancer cells.”
Similarly, more than half thought that immunotherapy started working right away, while only 20% correctly answered that it takes several weeks to become effective.
“This is important because patients need to start their therapy with realistic expectations, for example to avoid disappointment when their symptoms take some time to disappear,” Dr. Kosmidis said.
A small group of 24 patients with lung cancer who had been treated with immunotherapy got many correct answers, but they overestimated the intensity of side effects, compared with other therapies.
“Well-informed patients who know what to expect can do 90% of the job of preventing side effects from becoming severe by having them treated early,” said Dr. Donia, of the University of Copenhagen.
Most cancer patients were also unaware of the cost of immunotherapy, which can exceed $100,000 a year, Dr. Kosmidis said.
Results of the doctor survey
The other survey presented at the meeting looked at how much doctors know about survival for 12 of the most common cancers.
Dr. Murphy and colleagues asked 301 noncancer doctors and 46 cancer specialists to estimate the percentage of patients who could be expected to live for 5 years after diagnosis (a measure known as the 5-year survival rate).
Answers from the two groups were compared and graded according to cancer survival statistics from the National Cancer Registry of Ireland.
Both groups of doctors had a hard time estimating the survival of common cancers.
Nononcologists accurately predicted 5-year survival for just two of the cancer types, while the cancer specialists got it right for four cancer types.
However, the noncancer doctors had a more pessimistic outlook on cancer survival generally and severely underestimated the chances of survival in specific cancers, particularly stage IV breast cancer. The survival for this cancer has “evolved considerably over time and now reaches 40% in Ireland,” Dr. Murphy pointed out.
“These results are in line with what we had expected because most physicians’ knowledge of oncology dates back to whatever education they received during their years of training, so their perceptions of cancer prognosis are likely to lag behind the major survival gains achieved in the recent past,” Dr. Murphy said.
A version of this article first appeared on Medscape.com.
This is the main finding from two studies presented at the 2021 European Society for Medical Oncology Congress.
The survey of patients found that most don’t understand how immunotherapy works, and the survey of doctors found that many working outside of the cancer field are using information on survival that is wildly out of date.
When a patient is first told they have cancer, counseling is usually done by a surgeon or general medical doctor and not an oncologist, said Conleth Murphy, MD, of Bon Secours Hospital Cork, Ireland, and coauthor of the second study.
Noncancer doctors often grossly underestimate patients’ chances of survival, Dr. Murphy’s study found. This suggests that doctors who practice outside of cancer care may be working with the same information they learned in medical school, he said.
“These patients must be spared the traumatic effects of being handed a death sentence that no longer reflects the current reality,” Dr. Murphy said.
After receiving a diagnosis of cancer, “patients often immediately have pressing questions about what it means for their future,” he noted. A common question is: “How long do I have left?”
Nononcologists should refrain from answering patients’ questions with numbers, Dr. Murphy said.
Family doctors are likely to be influenced by the experience they have had with specific cancer patients in their practice, said Cyril Bonin, MD, a general practitioner in Usson-du-Poitou, France, who has 900 patients in his practice.
He sees about 10 patients with a new diagnosis of cancer each year. In addition, about 50 of his patients are in active treatment for cancer or have finished treatment and are considered cancer survivors.
“It is not entirely realistic for us to expect practitioners who deal with hundreds of different diseases to keep up with every facet of a rapidly changing oncology landscape,” said Marco Donia, MD, an expert in immunotherapy from the University of Copenhagen.
That landscape has changed dramatically in recent years, particularly since immunotherapy was added to the arsenal. Immunotherapy is a way to fine-tune your immune system to fight cancer.
For example, in the past, patients with metastatic melanoma would have an average survival of about 1 year. But now, some patients who have responded to immunotherapy are still alive 10 years later.
Findings from the patient survey
It is important that patients stay well informed because immunotherapy is a “complex treatment that is too often mistaken for a miracle cure,” said Paris Kosmidis, MD, the co-author of the patient survey.
“The more patients know about it, the better the communication with their medical team and thus the better their outcomes are likely to be,” said Dr. Kosmidis, who is co-founder and chief medical officer of CareAcross, an online service that provides personalized education for cancer patients
The survey was of 5,589 patients with cancer who were recruited from CareAcross clients from the United Kingdom, France, Italy, Spain, and Germany.
The survey asked them about how immunotherapy works, what it costs, and its side effects.
Almost half responded “not sure/do not know,” but about a third correctly answered that immunotherapy “activates the immune system to kill cancer cells.”
Similarly, more than half thought that immunotherapy started working right away, while only 20% correctly answered that it takes several weeks to become effective.
“This is important because patients need to start their therapy with realistic expectations, for example to avoid disappointment when their symptoms take some time to disappear,” Dr. Kosmidis said.
A small group of 24 patients with lung cancer who had been treated with immunotherapy got many correct answers, but they overestimated the intensity of side effects, compared with other therapies.
“Well-informed patients who know what to expect can do 90% of the job of preventing side effects from becoming severe by having them treated early,” said Dr. Donia, of the University of Copenhagen.
Most cancer patients were also unaware of the cost of immunotherapy, which can exceed $100,000 a year, Dr. Kosmidis said.
Results of the doctor survey
The other survey presented at the meeting looked at how much doctors know about survival for 12 of the most common cancers.
Dr. Murphy and colleagues asked 301 noncancer doctors and 46 cancer specialists to estimate the percentage of patients who could be expected to live for 5 years after diagnosis (a measure known as the 5-year survival rate).
Answers from the two groups were compared and graded according to cancer survival statistics from the National Cancer Registry of Ireland.
Both groups of doctors had a hard time estimating the survival of common cancers.
Nononcologists accurately predicted 5-year survival for just two of the cancer types, while the cancer specialists got it right for four cancer types.
However, the noncancer doctors had a more pessimistic outlook on cancer survival generally and severely underestimated the chances of survival in specific cancers, particularly stage IV breast cancer. The survival for this cancer has “evolved considerably over time and now reaches 40% in Ireland,” Dr. Murphy pointed out.
“These results are in line with what we had expected because most physicians’ knowledge of oncology dates back to whatever education they received during their years of training, so their perceptions of cancer prognosis are likely to lag behind the major survival gains achieved in the recent past,” Dr. Murphy said.
A version of this article first appeared on Medscape.com.
Novel trastuzumab duocarmazine significantly improved survival in advanced HER2-positive breast cancer
Based on significant progression-free survival (PFS) benefits shown in the phase 3 TULIP trial, trastuzumab duocarmazine (SYD985) may provide a new treatment option among HER2-positive metastatic breast cancer patients, according to Cristina Saura, MD, head of the breast cancer program at Vall d’Hebron University Hospital, Barcelona. Dr. Saura presented the results of the TULIP trial (abstract LBA15) on Sept. 19 at the 2021 European Society for Medical Oncology Congress.
Trastuzumab duocarmazine is a novel HER2-targeting antibody-drug conjugate that consists of trastuzumab and a drug containing duocarmycin. Its three-way mechanism of action includes uptake of the antibody-drug conjugate by internalization and intracellular release of duocarmycin with two bystander effects: proteolytic cleavage and subsequent release of payload in the tumor microenvironment and diffusion of active payload to neighboring tumor cells.
While one physician described the results as encouraging, another said the treatment is not nearly ready for primetime.
“It is encouraging to observe clinically meaningful and potentially practice changing progression-free survival improvements in patients receiving treatment in the third line and beyond,” said Aditya Bardia, MD, Massachusetts General Hospital, Boston. “Several agents have been approved as treatments for HER2-positive metastatic breast cancer in recent years including T-DXd, neratinib, tucatinib, and margetuximab. Trastuzumab duocarmazine could eventually be another option.”
Fatima Cardoso, MD, director of the breast cancer unit at the Breast Cancer Research Foundation, New York, said: “At this time there is only a minor 2-month difference in progression-free survival and a nonsignificant overall difference. With the high incidence of ocular toxicity and four toxic deaths, we cannot recommend this drug for clinical practice, in my opinion.”
Two or more prior therapies for metastatic breast cancer
TULIP investigators enrolled 437 patients from 83 sites in 11 countries with HER2-positive locally advanced or metastatic breast cancer who had received two or more therapies for metastatic disease (treatment for brain metastases allowed). They were randomized 2:1 to trastuzumab duocarmazine (1.2 mg/kg every 21 days, 291 patients) or physician’s choice (146 patients) of one of three trastuzumab-containing combinations or lapatinib plus capecitabine. Treatment was continued until progression or unacceptable toxicity. The primary endpoint was centrally assessed PFS.
Longer PFS with trastuzumab duocarmazine
Median age was 57 years, and the median number of prior metastatic breast cancer regimens was 4.7. Centrally reviewed PFS was significantly longer in the trastuzumab duocarmazine group at 7.0 months versus 4.9 months for physicians choice treatment (hazard ratio, 0.64; 95% confidence interval, 0.49-0.84; P = .002). Subgroup analysis, also centrally reviewed, revealed numerical advantage for trastuzumab duocarmazine over physician’s choice across all categories (except for Eastern Cooperative Oncology Group status 2). Analysis of PFS by investigators showed a similar benefit for trastuzumab duocarmazine (6.9 months vs. 4.6 months; HR, 0.60; P < .001).
A first look at median overall survival showed a nonsignificant advantage for trastuzumab duocarmazine (20.4 months vs. 16.3 months (HR, 0.83; 95% CI, 0.62-1.09, P = .153). The overall response rate (partial or complete response) was similar between groups at 27.8% for trastuzumab duocarmazine and 29.5% for physician’s choice with reductions in target lesion measurement at 70.2% and 32.2% for trastuzumab duocarmazine and physician’s choice, respectively. The clinical benefit rates were 38.5% for trastuzumab duocarmazine and 32.2% for physician’s choice.
Ocular toxicity
Most patients had at least one treatment-related adverse event (96.5% SD985, 96.4% PC), and grade 3 or higher event rates were similar between groups (52.8% SYD985, 48.2% PC). The most frequently reported adverse events for trastuzumab duocarmazine were ocular toxicity, with conjunctivitis reported in 38.2%, and keratitis in 38.2%, with fatigue at 33.3%; for physician’s choice these were diarrhea (35.8%), nausea (31.4%) and fatigue (29.9%). Interstitial lung disease pneumonitis was reported for 7.6% (5.2% grade 1-2) of patients treated with trastuzumab duocarmazine, including two grade 5 events.
Eye toxicity led to discontinuations in 20.8% of trastuzumab duocarmazine patients, dose modifications in 22.9%, with dose modifications for interstitial lung disease/pneumonitis in 5.2% of trastuzumab duocarmazine patients. Six fatalities (2.1%) were reported in the trastuzumab duocarmazine group, with four attributed to treatment. Assessment of health-related quality of life showed no significant difference between groups.
Dr. Manich outlined risk mitigation strategies. Patients with prior keratitis were excluded and patients were given prophylactic lubricating eye drops and regular eye exams by ophthalmologists. Treatment was discontinued if grade 3 or higher keratitis developed, and was delayed if grade 3 conjunctivitis developed until it reduced to grade 2. Also, patients with prior pneumonitis were excluded and CT lung scans were evaluated for lung changes. New or worsening respiratory symptoms triggered a full diagnostic workup. Treatment was discontinued for grade 2 or higher pneumonitis and delayed until resolution for grade 1 pneumonitis.
TULIP was funded by Byondis. Dr. Saura disclosed numerous financial interests including support from AstraZeneca and Daiichi Sankyo.
Based on significant progression-free survival (PFS) benefits shown in the phase 3 TULIP trial, trastuzumab duocarmazine (SYD985) may provide a new treatment option among HER2-positive metastatic breast cancer patients, according to Cristina Saura, MD, head of the breast cancer program at Vall d’Hebron University Hospital, Barcelona. Dr. Saura presented the results of the TULIP trial (abstract LBA15) on Sept. 19 at the 2021 European Society for Medical Oncology Congress.
Trastuzumab duocarmazine is a novel HER2-targeting antibody-drug conjugate that consists of trastuzumab and a drug containing duocarmycin. Its three-way mechanism of action includes uptake of the antibody-drug conjugate by internalization and intracellular release of duocarmycin with two bystander effects: proteolytic cleavage and subsequent release of payload in the tumor microenvironment and diffusion of active payload to neighboring tumor cells.
While one physician described the results as encouraging, another said the treatment is not nearly ready for primetime.
“It is encouraging to observe clinically meaningful and potentially practice changing progression-free survival improvements in patients receiving treatment in the third line and beyond,” said Aditya Bardia, MD, Massachusetts General Hospital, Boston. “Several agents have been approved as treatments for HER2-positive metastatic breast cancer in recent years including T-DXd, neratinib, tucatinib, and margetuximab. Trastuzumab duocarmazine could eventually be another option.”
Fatima Cardoso, MD, director of the breast cancer unit at the Breast Cancer Research Foundation, New York, said: “At this time there is only a minor 2-month difference in progression-free survival and a nonsignificant overall difference. With the high incidence of ocular toxicity and four toxic deaths, we cannot recommend this drug for clinical practice, in my opinion.”
Two or more prior therapies for metastatic breast cancer
TULIP investigators enrolled 437 patients from 83 sites in 11 countries with HER2-positive locally advanced or metastatic breast cancer who had received two or more therapies for metastatic disease (treatment for brain metastases allowed). They were randomized 2:1 to trastuzumab duocarmazine (1.2 mg/kg every 21 days, 291 patients) or physician’s choice (146 patients) of one of three trastuzumab-containing combinations or lapatinib plus capecitabine. Treatment was continued until progression or unacceptable toxicity. The primary endpoint was centrally assessed PFS.
Longer PFS with trastuzumab duocarmazine
Median age was 57 years, and the median number of prior metastatic breast cancer regimens was 4.7. Centrally reviewed PFS was significantly longer in the trastuzumab duocarmazine group at 7.0 months versus 4.9 months for physicians choice treatment (hazard ratio, 0.64; 95% confidence interval, 0.49-0.84; P = .002). Subgroup analysis, also centrally reviewed, revealed numerical advantage for trastuzumab duocarmazine over physician’s choice across all categories (except for Eastern Cooperative Oncology Group status 2). Analysis of PFS by investigators showed a similar benefit for trastuzumab duocarmazine (6.9 months vs. 4.6 months; HR, 0.60; P < .001).
A first look at median overall survival showed a nonsignificant advantage for trastuzumab duocarmazine (20.4 months vs. 16.3 months (HR, 0.83; 95% CI, 0.62-1.09, P = .153). The overall response rate (partial or complete response) was similar between groups at 27.8% for trastuzumab duocarmazine and 29.5% for physician’s choice with reductions in target lesion measurement at 70.2% and 32.2% for trastuzumab duocarmazine and physician’s choice, respectively. The clinical benefit rates were 38.5% for trastuzumab duocarmazine and 32.2% for physician’s choice.
Ocular toxicity
Most patients had at least one treatment-related adverse event (96.5% SD985, 96.4% PC), and grade 3 or higher event rates were similar between groups (52.8% SYD985, 48.2% PC). The most frequently reported adverse events for trastuzumab duocarmazine were ocular toxicity, with conjunctivitis reported in 38.2%, and keratitis in 38.2%, with fatigue at 33.3%; for physician’s choice these were diarrhea (35.8%), nausea (31.4%) and fatigue (29.9%). Interstitial lung disease pneumonitis was reported for 7.6% (5.2% grade 1-2) of patients treated with trastuzumab duocarmazine, including two grade 5 events.
Eye toxicity led to discontinuations in 20.8% of trastuzumab duocarmazine patients, dose modifications in 22.9%, with dose modifications for interstitial lung disease/pneumonitis in 5.2% of trastuzumab duocarmazine patients. Six fatalities (2.1%) were reported in the trastuzumab duocarmazine group, with four attributed to treatment. Assessment of health-related quality of life showed no significant difference between groups.
Dr. Manich outlined risk mitigation strategies. Patients with prior keratitis were excluded and patients were given prophylactic lubricating eye drops and regular eye exams by ophthalmologists. Treatment was discontinued if grade 3 or higher keratitis developed, and was delayed if grade 3 conjunctivitis developed until it reduced to grade 2. Also, patients with prior pneumonitis were excluded and CT lung scans were evaluated for lung changes. New or worsening respiratory symptoms triggered a full diagnostic workup. Treatment was discontinued for grade 2 or higher pneumonitis and delayed until resolution for grade 1 pneumonitis.
TULIP was funded by Byondis. Dr. Saura disclosed numerous financial interests including support from AstraZeneca and Daiichi Sankyo.
Based on significant progression-free survival (PFS) benefits shown in the phase 3 TULIP trial, trastuzumab duocarmazine (SYD985) may provide a new treatment option among HER2-positive metastatic breast cancer patients, according to Cristina Saura, MD, head of the breast cancer program at Vall d’Hebron University Hospital, Barcelona. Dr. Saura presented the results of the TULIP trial (abstract LBA15) on Sept. 19 at the 2021 European Society for Medical Oncology Congress.
Trastuzumab duocarmazine is a novel HER2-targeting antibody-drug conjugate that consists of trastuzumab and a drug containing duocarmycin. Its three-way mechanism of action includes uptake of the antibody-drug conjugate by internalization and intracellular release of duocarmycin with two bystander effects: proteolytic cleavage and subsequent release of payload in the tumor microenvironment and diffusion of active payload to neighboring tumor cells.
While one physician described the results as encouraging, another said the treatment is not nearly ready for primetime.
“It is encouraging to observe clinically meaningful and potentially practice changing progression-free survival improvements in patients receiving treatment in the third line and beyond,” said Aditya Bardia, MD, Massachusetts General Hospital, Boston. “Several agents have been approved as treatments for HER2-positive metastatic breast cancer in recent years including T-DXd, neratinib, tucatinib, and margetuximab. Trastuzumab duocarmazine could eventually be another option.”
Fatima Cardoso, MD, director of the breast cancer unit at the Breast Cancer Research Foundation, New York, said: “At this time there is only a minor 2-month difference in progression-free survival and a nonsignificant overall difference. With the high incidence of ocular toxicity and four toxic deaths, we cannot recommend this drug for clinical practice, in my opinion.”
Two or more prior therapies for metastatic breast cancer
TULIP investigators enrolled 437 patients from 83 sites in 11 countries with HER2-positive locally advanced or metastatic breast cancer who had received two or more therapies for metastatic disease (treatment for brain metastases allowed). They were randomized 2:1 to trastuzumab duocarmazine (1.2 mg/kg every 21 days, 291 patients) or physician’s choice (146 patients) of one of three trastuzumab-containing combinations or lapatinib plus capecitabine. Treatment was continued until progression or unacceptable toxicity. The primary endpoint was centrally assessed PFS.
Longer PFS with trastuzumab duocarmazine
Median age was 57 years, and the median number of prior metastatic breast cancer regimens was 4.7. Centrally reviewed PFS was significantly longer in the trastuzumab duocarmazine group at 7.0 months versus 4.9 months for physicians choice treatment (hazard ratio, 0.64; 95% confidence interval, 0.49-0.84; P = .002). Subgroup analysis, also centrally reviewed, revealed numerical advantage for trastuzumab duocarmazine over physician’s choice across all categories (except for Eastern Cooperative Oncology Group status 2). Analysis of PFS by investigators showed a similar benefit for trastuzumab duocarmazine (6.9 months vs. 4.6 months; HR, 0.60; P < .001).
A first look at median overall survival showed a nonsignificant advantage for trastuzumab duocarmazine (20.4 months vs. 16.3 months (HR, 0.83; 95% CI, 0.62-1.09, P = .153). The overall response rate (partial or complete response) was similar between groups at 27.8% for trastuzumab duocarmazine and 29.5% for physician’s choice with reductions in target lesion measurement at 70.2% and 32.2% for trastuzumab duocarmazine and physician’s choice, respectively. The clinical benefit rates were 38.5% for trastuzumab duocarmazine and 32.2% for physician’s choice.
Ocular toxicity
Most patients had at least one treatment-related adverse event (96.5% SD985, 96.4% PC), and grade 3 or higher event rates were similar between groups (52.8% SYD985, 48.2% PC). The most frequently reported adverse events for trastuzumab duocarmazine were ocular toxicity, with conjunctivitis reported in 38.2%, and keratitis in 38.2%, with fatigue at 33.3%; for physician’s choice these were diarrhea (35.8%), nausea (31.4%) and fatigue (29.9%). Interstitial lung disease pneumonitis was reported for 7.6% (5.2% grade 1-2) of patients treated with trastuzumab duocarmazine, including two grade 5 events.
Eye toxicity led to discontinuations in 20.8% of trastuzumab duocarmazine patients, dose modifications in 22.9%, with dose modifications for interstitial lung disease/pneumonitis in 5.2% of trastuzumab duocarmazine patients. Six fatalities (2.1%) were reported in the trastuzumab duocarmazine group, with four attributed to treatment. Assessment of health-related quality of life showed no significant difference between groups.
Dr. Manich outlined risk mitigation strategies. Patients with prior keratitis were excluded and patients were given prophylactic lubricating eye drops and regular eye exams by ophthalmologists. Treatment was discontinued if grade 3 or higher keratitis developed, and was delayed if grade 3 conjunctivitis developed until it reduced to grade 2. Also, patients with prior pneumonitis were excluded and CT lung scans were evaluated for lung changes. New or worsening respiratory symptoms triggered a full diagnostic workup. Treatment was discontinued for grade 2 or higher pneumonitis and delayed until resolution for grade 1 pneumonitis.
TULIP was funded by Byondis. Dr. Saura disclosed numerous financial interests including support from AstraZeneca and Daiichi Sankyo.
FROM ESMO 2021
Treatment shows 'important improvements' in triple-negative breast cancer
But as a subanalysis of data from the randomized, phase 3 study showed, sacituzumab govitecan was associated with significantly better progression-free survival (PFS) and overall survival among patients without an initial TNBC diagnosis, with efficacy similar to that seen in the overall study population and in patients without known brain metastases, reported Joyce O’Shaughnessy, MD, at the 2021 European Society for Medical Oncology Congress. In her presentation (abstract 258P), Dr. O’Shaughnessy, who is an oncologist with the Texas Oncology–Baylor Charles A. Sammons Cancer Center in Dallas, said that it’s not uncommon to see acquired triple-negative breast cancer in patients who have hormone receptor–positive disease initially and then later on, develop triple-negative breast cancer.
“That is why at the time of metastatic diagnosis we always say that patients should have repeat receptor [testing], because it’s been well described that a subset of hormone receptor–positive breast can become triple negative under pressure from endocrine therapy,” said ASCENT coinvestigator Aditya Bardia, MD, MPH, Massachusetts General Hospital, Boston, in an interview
Coinvestigator Kevine Punie, MD, from University Hospitals Leuven (Belgium), said that “triple-negative breast cancer is a diagnosis of exclusion. This is a heterogenous disease where several biological subsets are merged.”
“It was important to perform this subgroup analysis to reassure us that the treatment effect we see from [sacituzumab govitecan] in the overall population is also observed in this specific subgroup of patients where biologically we’re treating a different disease,” he said in an interview.
Antibody-drug conjugate
Sacituzumab govitecan consists of an antibody targeted to the trophoblast antigen 2 cell surface receptor found on most breast cancer cells, plus the topoisomerase-1 inhibitor SN-38 as its toxic payload.
In the primary intent-to-treat (ITT) analysis of ASCENT, sacituzumab significantly prolonged PFS with a median of 4.8 versus 1.7 months for patients treated with the physician’s choice of either capecitabine, eribulin, vinorelbine, or gemcitabine. The difference translated into an HR for progression with the antibody-drug conjugate of 0.41 (P < .00001).
The subgroup analysis looked at outcomes for 70 patients randomized to sacituzumab govitecan and 78 randomized to single-agent chemotherapy who did not have an initial diagnosis of TNBC.
In all, 27% of patients in this subgroup in the sacituzumab arm and 29% in the chemotherapy arm had received a prior line of treatment with a CDK4/6 inhibitor.
At the time of data cutoff in March 2020, four patients (6%) in the sacituzumab arm remained on treatment versus no patient in the chemotherapy arm. The most common reason for treatment discontinuation was disease progression, which occurred in 84% and 72% of patients, respectively.
The median treatment duration was 5.1 months in the sacituzumab and 1.2 months in the chemotherapy arm. The median duration of follow-up was 10.6 and 6.1 months, respectively.
Progression-free survival, overall survival results
For all patients without an initial TNBC diagnosis, the median PFS was 4.6 months with sacituzumab versus 2.3 months with chemotherapy, which translated into a hazard ratio for progression of 0.48 (95% confidence interval, 0.32-0.72). The progression-free benefit with the antibody-drug conjugate was similar to that seen in the intent-to-treat population, as noted before, and among the overall population of patients in the study with no known brain metastases (HR, 5.6 vs. 1.7, respectively; P < .001).
The objective response rates were 21% in the sacituzumab and 5% in the chemotherapy arm. Objective responses were not affected by the prior use of CDK 4/6 inhibitors.
Median overall survival in this subgroup was 12.4 months with the antibody-drug conjugate versus 6.7 months with chemotherapy (95% CI, 0.30-0.64).
The investigators reported that the safety profile was manageable in this subgroup of patients, with a low rate of treatment discontinuations because of adverse events (5%) and no treatment-related deaths with sacituzumab govitecan.
Health-related quality of life
In a separate poster (abstract 257P) presented at the meeting, the ASCENT investigators reported health-related quality of life results in the overall population.
The mean European Organization for the Research and Treatment of Cancer quality of life questionnaire subscale scores at baseline were similar between treatment arms.
For the major domains of global health status, physical and emotional functioning as well as lower symptomatic impact of fatigue, pain, dyspnea, and insomnia, sacituzumab govitecan showed “significantly and meaningfully greater improvement” than the physician’s choice of chemotherapy, the investigators found.
Of individual symptoms, only diarrhea was worse with the antibody-drug conjugate.
“These were important improvements,” Dr. Punie said, “because we saw improvements in the primary health-related quality of life domains such as global health status. We also saw that the time to clinically meaningful deterioration of quality of life domains were significantly longer for patients treated with [sacituzumab govitecan].”
“Patients who received sacituzumab govitecan had better health-related quality of life as compared to the control arm, and that’s a very important result, because in the metastatic setting our goal is twofold: We want to prolong survival, and we want patients to have improved quality of life,” Dr. Bardia said.
The Ascent trial is sponsored by Gilead Sciences. Dr. Punie disclosed relationships with multiple companies/organizations, not including Gilead. Dr. Bardia disclosed contracted research for Gilead and others, as well as other relationships.
But as a subanalysis of data from the randomized, phase 3 study showed, sacituzumab govitecan was associated with significantly better progression-free survival (PFS) and overall survival among patients without an initial TNBC diagnosis, with efficacy similar to that seen in the overall study population and in patients without known brain metastases, reported Joyce O’Shaughnessy, MD, at the 2021 European Society for Medical Oncology Congress. In her presentation (abstract 258P), Dr. O’Shaughnessy, who is an oncologist with the Texas Oncology–Baylor Charles A. Sammons Cancer Center in Dallas, said that it’s not uncommon to see acquired triple-negative breast cancer in patients who have hormone receptor–positive disease initially and then later on, develop triple-negative breast cancer.
“That is why at the time of metastatic diagnosis we always say that patients should have repeat receptor [testing], because it’s been well described that a subset of hormone receptor–positive breast can become triple negative under pressure from endocrine therapy,” said ASCENT coinvestigator Aditya Bardia, MD, MPH, Massachusetts General Hospital, Boston, in an interview
Coinvestigator Kevine Punie, MD, from University Hospitals Leuven (Belgium), said that “triple-negative breast cancer is a diagnosis of exclusion. This is a heterogenous disease where several biological subsets are merged.”
“It was important to perform this subgroup analysis to reassure us that the treatment effect we see from [sacituzumab govitecan] in the overall population is also observed in this specific subgroup of patients where biologically we’re treating a different disease,” he said in an interview.
Antibody-drug conjugate
Sacituzumab govitecan consists of an antibody targeted to the trophoblast antigen 2 cell surface receptor found on most breast cancer cells, plus the topoisomerase-1 inhibitor SN-38 as its toxic payload.
In the primary intent-to-treat (ITT) analysis of ASCENT, sacituzumab significantly prolonged PFS with a median of 4.8 versus 1.7 months for patients treated with the physician’s choice of either capecitabine, eribulin, vinorelbine, or gemcitabine. The difference translated into an HR for progression with the antibody-drug conjugate of 0.41 (P < .00001).
The subgroup analysis looked at outcomes for 70 patients randomized to sacituzumab govitecan and 78 randomized to single-agent chemotherapy who did not have an initial diagnosis of TNBC.
In all, 27% of patients in this subgroup in the sacituzumab arm and 29% in the chemotherapy arm had received a prior line of treatment with a CDK4/6 inhibitor.
At the time of data cutoff in March 2020, four patients (6%) in the sacituzumab arm remained on treatment versus no patient in the chemotherapy arm. The most common reason for treatment discontinuation was disease progression, which occurred in 84% and 72% of patients, respectively.
The median treatment duration was 5.1 months in the sacituzumab and 1.2 months in the chemotherapy arm. The median duration of follow-up was 10.6 and 6.1 months, respectively.
Progression-free survival, overall survival results
For all patients without an initial TNBC diagnosis, the median PFS was 4.6 months with sacituzumab versus 2.3 months with chemotherapy, which translated into a hazard ratio for progression of 0.48 (95% confidence interval, 0.32-0.72). The progression-free benefit with the antibody-drug conjugate was similar to that seen in the intent-to-treat population, as noted before, and among the overall population of patients in the study with no known brain metastases (HR, 5.6 vs. 1.7, respectively; P < .001).
The objective response rates were 21% in the sacituzumab and 5% in the chemotherapy arm. Objective responses were not affected by the prior use of CDK 4/6 inhibitors.
Median overall survival in this subgroup was 12.4 months with the antibody-drug conjugate versus 6.7 months with chemotherapy (95% CI, 0.30-0.64).
The investigators reported that the safety profile was manageable in this subgroup of patients, with a low rate of treatment discontinuations because of adverse events (5%) and no treatment-related deaths with sacituzumab govitecan.
Health-related quality of life
In a separate poster (abstract 257P) presented at the meeting, the ASCENT investigators reported health-related quality of life results in the overall population.
The mean European Organization for the Research and Treatment of Cancer quality of life questionnaire subscale scores at baseline were similar between treatment arms.
For the major domains of global health status, physical and emotional functioning as well as lower symptomatic impact of fatigue, pain, dyspnea, and insomnia, sacituzumab govitecan showed “significantly and meaningfully greater improvement” than the physician’s choice of chemotherapy, the investigators found.
Of individual symptoms, only diarrhea was worse with the antibody-drug conjugate.
“These were important improvements,” Dr. Punie said, “because we saw improvements in the primary health-related quality of life domains such as global health status. We also saw that the time to clinically meaningful deterioration of quality of life domains were significantly longer for patients treated with [sacituzumab govitecan].”
“Patients who received sacituzumab govitecan had better health-related quality of life as compared to the control arm, and that’s a very important result, because in the metastatic setting our goal is twofold: We want to prolong survival, and we want patients to have improved quality of life,” Dr. Bardia said.
The Ascent trial is sponsored by Gilead Sciences. Dr. Punie disclosed relationships with multiple companies/organizations, not including Gilead. Dr. Bardia disclosed contracted research for Gilead and others, as well as other relationships.
But as a subanalysis of data from the randomized, phase 3 study showed, sacituzumab govitecan was associated with significantly better progression-free survival (PFS) and overall survival among patients without an initial TNBC diagnosis, with efficacy similar to that seen in the overall study population and in patients without known brain metastases, reported Joyce O’Shaughnessy, MD, at the 2021 European Society for Medical Oncology Congress. In her presentation (abstract 258P), Dr. O’Shaughnessy, who is an oncologist with the Texas Oncology–Baylor Charles A. Sammons Cancer Center in Dallas, said that it’s not uncommon to see acquired triple-negative breast cancer in patients who have hormone receptor–positive disease initially and then later on, develop triple-negative breast cancer.
“That is why at the time of metastatic diagnosis we always say that patients should have repeat receptor [testing], because it’s been well described that a subset of hormone receptor–positive breast can become triple negative under pressure from endocrine therapy,” said ASCENT coinvestigator Aditya Bardia, MD, MPH, Massachusetts General Hospital, Boston, in an interview
Coinvestigator Kevine Punie, MD, from University Hospitals Leuven (Belgium), said that “triple-negative breast cancer is a diagnosis of exclusion. This is a heterogenous disease where several biological subsets are merged.”
“It was important to perform this subgroup analysis to reassure us that the treatment effect we see from [sacituzumab govitecan] in the overall population is also observed in this specific subgroup of patients where biologically we’re treating a different disease,” he said in an interview.
Antibody-drug conjugate
Sacituzumab govitecan consists of an antibody targeted to the trophoblast antigen 2 cell surface receptor found on most breast cancer cells, plus the topoisomerase-1 inhibitor SN-38 as its toxic payload.
In the primary intent-to-treat (ITT) analysis of ASCENT, sacituzumab significantly prolonged PFS with a median of 4.8 versus 1.7 months for patients treated with the physician’s choice of either capecitabine, eribulin, vinorelbine, or gemcitabine. The difference translated into an HR for progression with the antibody-drug conjugate of 0.41 (P < .00001).
The subgroup analysis looked at outcomes for 70 patients randomized to sacituzumab govitecan and 78 randomized to single-agent chemotherapy who did not have an initial diagnosis of TNBC.
In all, 27% of patients in this subgroup in the sacituzumab arm and 29% in the chemotherapy arm had received a prior line of treatment with a CDK4/6 inhibitor.
At the time of data cutoff in March 2020, four patients (6%) in the sacituzumab arm remained on treatment versus no patient in the chemotherapy arm. The most common reason for treatment discontinuation was disease progression, which occurred in 84% and 72% of patients, respectively.
The median treatment duration was 5.1 months in the sacituzumab and 1.2 months in the chemotherapy arm. The median duration of follow-up was 10.6 and 6.1 months, respectively.
Progression-free survival, overall survival results
For all patients without an initial TNBC diagnosis, the median PFS was 4.6 months with sacituzumab versus 2.3 months with chemotherapy, which translated into a hazard ratio for progression of 0.48 (95% confidence interval, 0.32-0.72). The progression-free benefit with the antibody-drug conjugate was similar to that seen in the intent-to-treat population, as noted before, and among the overall population of patients in the study with no known brain metastases (HR, 5.6 vs. 1.7, respectively; P < .001).
The objective response rates were 21% in the sacituzumab and 5% in the chemotherapy arm. Objective responses were not affected by the prior use of CDK 4/6 inhibitors.
Median overall survival in this subgroup was 12.4 months with the antibody-drug conjugate versus 6.7 months with chemotherapy (95% CI, 0.30-0.64).
The investigators reported that the safety profile was manageable in this subgroup of patients, with a low rate of treatment discontinuations because of adverse events (5%) and no treatment-related deaths with sacituzumab govitecan.
Health-related quality of life
In a separate poster (abstract 257P) presented at the meeting, the ASCENT investigators reported health-related quality of life results in the overall population.
The mean European Organization for the Research and Treatment of Cancer quality of life questionnaire subscale scores at baseline were similar between treatment arms.
For the major domains of global health status, physical and emotional functioning as well as lower symptomatic impact of fatigue, pain, dyspnea, and insomnia, sacituzumab govitecan showed “significantly and meaningfully greater improvement” than the physician’s choice of chemotherapy, the investigators found.
Of individual symptoms, only diarrhea was worse with the antibody-drug conjugate.
“These were important improvements,” Dr. Punie said, “because we saw improvements in the primary health-related quality of life domains such as global health status. We also saw that the time to clinically meaningful deterioration of quality of life domains were significantly longer for patients treated with [sacituzumab govitecan].”
“Patients who received sacituzumab govitecan had better health-related quality of life as compared to the control arm, and that’s a very important result, because in the metastatic setting our goal is twofold: We want to prolong survival, and we want patients to have improved quality of life,” Dr. Bardia said.
The Ascent trial is sponsored by Gilead Sciences. Dr. Punie disclosed relationships with multiple companies/organizations, not including Gilead. Dr. Bardia disclosed contracted research for Gilead and others, as well as other relationships.
FROM ESMO 2021
Better survival with extended letrozole in early-stage breast cancer
The approach “should be considered among the optimal standard endocrine treatments for postmenopausal patients with hormone receptor–positive breast cancer, regardless of the nodal status at diagnosis,” concluded investigators led by Lucia Del Mastro, MD, a medical oncologist at the University of Genoa, Italy.
Clinical practice guidelines recommend an individualized approach to decide the duration of treatment based on relapse risk and tolerability because no study until now has shown an overall survival benefit with extended aromatase inhibitor therapy. Based on “our results ... this statement is no longer supported by the evidence and should be updated,” they wrote.
The optimal duration or type of endocrine therapy has been uncertain; the team sought to bring more clarity to the issue.
Following 2-3 years of adjuvant tamoxifen, they randomized evenly 2,056 women at 69 hospitals in Italy to either 2-3 years or letrozole 2.5 mg once daily – the usual care control group – or 5 years. Women in the trial, dubbed GIM4, had stage I-III histologically proven and operable invasive cancer, with no signs of disease recurrence.
Twelve-year overall survival was 88% with extended letrozole, but 84% in the control arm (HR 0.77, 95% confidence interval, 0.60-0.98; P = 0.036).
Twelve-year disease-free survival was 67% in the extended group versus 62% in the control arm (HR 0.78, 95% CI, 0.65-0.93; P = 0.0064).
At a median follow-up of 11.7 years, disease-free survival (DFS) events occurred in 25.4% of control patients, but only 20.7% with extended aromatase inhibitor treatment.
It took 9.5 years for the survival curves to separate, suggesting “that the effect of letrozole takes several years to be seen,” the investigators said.
With the disease-free survival benefits shown in earlier trials and now better overall survival as well, it’s looking like “7-8 years of adjuvant therapy, including at least 5 years with an aromatase inhibitor, could be the optimal duration of adjuvant endocrine therapy in postmenopausal patients with breast cancer.” It probably represents “the best compromise between efficacy and side-effects,” they said.
Breast cancer oncologists Rachel L. Yung, MD, and Nancy E. Davidson, MD, both of the Fred Hutchinson Cancer Research Center, Seattle, agreed in an editorial.
For now, “the currently available data seem to recommend 5 years of aromatase inhibitor for postmenopausal women who have already completed 2-3 years of tamoxifen,” they said.
However, with 19.5% of control patients and 37.1% in the extended stopping treatment early, “GIM4 highlights that early therapy discontinuation remains a crucial issue ... better ways to promote adherence are sorely needed. Another area of focus is the identification of biomarkers that could [better] inform the optimal duration of therapy,” they said.
Longer duration of letrozole was associated with an increased incidence of arthralgia, myalgia, hypertension, and osteoporosis; however, there was no difference in the incidence of bone fractures.
There was also a slightly higher number of cardiovascular events (1% in the extended group, but fewer in the control arm) which is a known issue with aromatase inhibitors. There were three serious treatment-related adverse events in the control arm and eight in the extended group, but no deaths. The Italian investigators noted that because they enrolled only patients free of recurrence after 2-3 years of tamoxifen, the population with early relapse who were likely to be node-positive, was excluded, leaving only patients with a better prognosis. “On the other hand, patients with node-negative disease relapse later and are therefore captured by this trial with a long follow-up.”
The work was funded by Novartis and the Italian Ministry of Health. The investigators had numerous industry ties, including Dr. Del Mastro, who reported honoraria and nonfinancial support from Novartis, Roche, Pfizer, and others. The editorialists didn’t have any competing interests.
The approach “should be considered among the optimal standard endocrine treatments for postmenopausal patients with hormone receptor–positive breast cancer, regardless of the nodal status at diagnosis,” concluded investigators led by Lucia Del Mastro, MD, a medical oncologist at the University of Genoa, Italy.
Clinical practice guidelines recommend an individualized approach to decide the duration of treatment based on relapse risk and tolerability because no study until now has shown an overall survival benefit with extended aromatase inhibitor therapy. Based on “our results ... this statement is no longer supported by the evidence and should be updated,” they wrote.
The optimal duration or type of endocrine therapy has been uncertain; the team sought to bring more clarity to the issue.
Following 2-3 years of adjuvant tamoxifen, they randomized evenly 2,056 women at 69 hospitals in Italy to either 2-3 years or letrozole 2.5 mg once daily – the usual care control group – or 5 years. Women in the trial, dubbed GIM4, had stage I-III histologically proven and operable invasive cancer, with no signs of disease recurrence.
Twelve-year overall survival was 88% with extended letrozole, but 84% in the control arm (HR 0.77, 95% confidence interval, 0.60-0.98; P = 0.036).
Twelve-year disease-free survival was 67% in the extended group versus 62% in the control arm (HR 0.78, 95% CI, 0.65-0.93; P = 0.0064).
At a median follow-up of 11.7 years, disease-free survival (DFS) events occurred in 25.4% of control patients, but only 20.7% with extended aromatase inhibitor treatment.
It took 9.5 years for the survival curves to separate, suggesting “that the effect of letrozole takes several years to be seen,” the investigators said.
With the disease-free survival benefits shown in earlier trials and now better overall survival as well, it’s looking like “7-8 years of adjuvant therapy, including at least 5 years with an aromatase inhibitor, could be the optimal duration of adjuvant endocrine therapy in postmenopausal patients with breast cancer.” It probably represents “the best compromise between efficacy and side-effects,” they said.
Breast cancer oncologists Rachel L. Yung, MD, and Nancy E. Davidson, MD, both of the Fred Hutchinson Cancer Research Center, Seattle, agreed in an editorial.
For now, “the currently available data seem to recommend 5 years of aromatase inhibitor for postmenopausal women who have already completed 2-3 years of tamoxifen,” they said.
However, with 19.5% of control patients and 37.1% in the extended stopping treatment early, “GIM4 highlights that early therapy discontinuation remains a crucial issue ... better ways to promote adherence are sorely needed. Another area of focus is the identification of biomarkers that could [better] inform the optimal duration of therapy,” they said.
Longer duration of letrozole was associated with an increased incidence of arthralgia, myalgia, hypertension, and osteoporosis; however, there was no difference in the incidence of bone fractures.
There was also a slightly higher number of cardiovascular events (1% in the extended group, but fewer in the control arm) which is a known issue with aromatase inhibitors. There were three serious treatment-related adverse events in the control arm and eight in the extended group, but no deaths. The Italian investigators noted that because they enrolled only patients free of recurrence after 2-3 years of tamoxifen, the population with early relapse who were likely to be node-positive, was excluded, leaving only patients with a better prognosis. “On the other hand, patients with node-negative disease relapse later and are therefore captured by this trial with a long follow-up.”
The work was funded by Novartis and the Italian Ministry of Health. The investigators had numerous industry ties, including Dr. Del Mastro, who reported honoraria and nonfinancial support from Novartis, Roche, Pfizer, and others. The editorialists didn’t have any competing interests.
The approach “should be considered among the optimal standard endocrine treatments for postmenopausal patients with hormone receptor–positive breast cancer, regardless of the nodal status at diagnosis,” concluded investigators led by Lucia Del Mastro, MD, a medical oncologist at the University of Genoa, Italy.
Clinical practice guidelines recommend an individualized approach to decide the duration of treatment based on relapse risk and tolerability because no study until now has shown an overall survival benefit with extended aromatase inhibitor therapy. Based on “our results ... this statement is no longer supported by the evidence and should be updated,” they wrote.
The optimal duration or type of endocrine therapy has been uncertain; the team sought to bring more clarity to the issue.
Following 2-3 years of adjuvant tamoxifen, they randomized evenly 2,056 women at 69 hospitals in Italy to either 2-3 years or letrozole 2.5 mg once daily – the usual care control group – or 5 years. Women in the trial, dubbed GIM4, had stage I-III histologically proven and operable invasive cancer, with no signs of disease recurrence.
Twelve-year overall survival was 88% with extended letrozole, but 84% in the control arm (HR 0.77, 95% confidence interval, 0.60-0.98; P = 0.036).
Twelve-year disease-free survival was 67% in the extended group versus 62% in the control arm (HR 0.78, 95% CI, 0.65-0.93; P = 0.0064).
At a median follow-up of 11.7 years, disease-free survival (DFS) events occurred in 25.4% of control patients, but only 20.7% with extended aromatase inhibitor treatment.
It took 9.5 years for the survival curves to separate, suggesting “that the effect of letrozole takes several years to be seen,” the investigators said.
With the disease-free survival benefits shown in earlier trials and now better overall survival as well, it’s looking like “7-8 years of adjuvant therapy, including at least 5 years with an aromatase inhibitor, could be the optimal duration of adjuvant endocrine therapy in postmenopausal patients with breast cancer.” It probably represents “the best compromise between efficacy and side-effects,” they said.
Breast cancer oncologists Rachel L. Yung, MD, and Nancy E. Davidson, MD, both of the Fred Hutchinson Cancer Research Center, Seattle, agreed in an editorial.
For now, “the currently available data seem to recommend 5 years of aromatase inhibitor for postmenopausal women who have already completed 2-3 years of tamoxifen,” they said.
However, with 19.5% of control patients and 37.1% in the extended stopping treatment early, “GIM4 highlights that early therapy discontinuation remains a crucial issue ... better ways to promote adherence are sorely needed. Another area of focus is the identification of biomarkers that could [better] inform the optimal duration of therapy,” they said.
Longer duration of letrozole was associated with an increased incidence of arthralgia, myalgia, hypertension, and osteoporosis; however, there was no difference in the incidence of bone fractures.
There was also a slightly higher number of cardiovascular events (1% in the extended group, but fewer in the control arm) which is a known issue with aromatase inhibitors. There were three serious treatment-related adverse events in the control arm and eight in the extended group, but no deaths. The Italian investigators noted that because they enrolled only patients free of recurrence after 2-3 years of tamoxifen, the population with early relapse who were likely to be node-positive, was excluded, leaving only patients with a better prognosis. “On the other hand, patients with node-negative disease relapse later and are therefore captured by this trial with a long follow-up.”
The work was funded by Novartis and the Italian Ministry of Health. The investigators had numerous industry ties, including Dr. Del Mastro, who reported honoraria and nonfinancial support from Novartis, Roche, Pfizer, and others. The editorialists didn’t have any competing interests.
FROM THE LANCET ONCOLOGY
TULIP trial shows extended survival in HER2+ metastatic breast cancer
, according to Cristina Saura Manich, MD, Hospital Universitario Valle de Hebrón, Barcelona. In TULIP, trastuzumab duocarmazine (SYD985, Byondis B.V., NL) was compared with physician’s choice of chemotherapy, Dr. Saura said at the virtual European Society for Medical Oncology Congress 2021 on Sept. 18 (abstract LBA15).
Trastuzumab duocarmazine, Dr. Manich noted, is a novel HER2-targeting antibody–drug conjugate based on trastuzumab and a cleavable linker-duocarmycin (vc-seco-DUBA) payload. Its three-way mechanism of action includes uptake of the antibody–drug conjugate by internalization and intracellular release of the payload, and two bystander effects: proteolytic cleavage and subsequent release of payload in the tumor microenvironment and diffusion of active payload to neighboring tumor cells.
Two or more prior therapies for metastatic breast cancer
TULIP investigators enrolled 437 patients from 83 sites in 11 countries with HER2-positive locally advanced or metastatic breast cancer who had received two or more therapies for metastatic disease (treatment for brain metastases allowed). They were randomized 2:1 to SYD985 (1.2 mg/kg IV every 21 days [n = 291]) or physician’s choice (PC) [n = 146] of one of three trastuzumab-containing combinations or lapatinib plus capecitabine. Treatment was continued until progression or unacceptable toxicity. The primary endpoint was centrally assessed PFS.
Longer progression-free survival with SYD985
Median age was 57 years, and the median number of prior metastatic breast cancer regimens was 4.7. Centrally reviewed progression-free survival was significantly longer in the SYD985 group at 7.0 months (5.4-7.2) versus 4.9 months (4.0-5.5) for PC (hazard ratio [HR], 0.64, 95% confidence interval [CI], 0.49-0.84, P = .002). Subgroup analysis, also centrally reviewed, revealed numerical advantage for SYD985 over physician choice across all categories (except for ECOG status 2). Analysis of progression-free survival by investigators showed a similar benefit for SYD985 (6.9 months versus 4.6 months, HR, 0.60, P < .001).
A first look at median overall survival showed a nonsignificant advantage for SYD985 (20.4 months versus 16.3 months (HR, 0.83, 95% CI, 0.62-1.09, P = .153). The overall response rate (partial or complete response) was similar between groups at 27.8% for SYD985 and 29.5% for PC, with reductions in target lesion measurement at 70.2% and 32.2% for SYD985 and physician choice, respectively. The clinical benefit rates were 38.5% for SYD985 and 32.2% for physician choice.
Ocular toxicity
Most patients had at least one treatment-related adverse event (96.5% SD985, 96.4% PC), and grade 3 or higher event rates were similar between groups (52.8% SYD985, 48.2% PC). The most frequently reported adverse events for SYD985 were ocular toxicity, with conjunctivitis reported in 38.2%, and keratitis in 38.2%, with fatigue at 33.3%; for physician’s choice these were diarrhea (35.8%), nausea (31.4%), and fatigue (29.9%). Interstitial lung disease pneumonitis was reported for 7.6% (5.2% grade 1-2) of patients treated with SYD985, including two grade 5 events. Eye toxicity led to discontinuations in 20.8% of SYD985 patients, dose modifications in 22.9%, with dose modifications for interstitial lung disease/pneumonitis in 5.2% of SYD985 patients. Six fatalities (2.1%) were reported in the SYD985 group, with four attributed to treatment. Assessment of health-related quality of life showed no significant difference between groups.
Dr. Manich outlined risk mitigation strategies. Patients with prior keratitis were excluded and patients were given prophylactic lubricating eye drops and regular eye exams by ophthalmologists. Treatment was discontinued if grade 3 or higher keratitis developed, and was delayed if grade 3 conjunctivitis developed until it reduced to grade 2. Also, patients with prior pneumonitis were excluded and CT lung scans were evaluated for lung changes. New or worsening respiratory symptoms triggered a full diagnostic workup. Treatment was discontinued for grade 2 or higher pneumonitis and delayed until resolution for grade 1 pneumonitis.
Another option
“It is encouraging to observe clinically meaningful and potentially practice changing PFS improvements in patients receiving treatment in the third line and beyond,” said Aditya Bardia, MD, of Massachusetts General Hospital and Harvard Medical School, Boston. “Several agents have been approved as treatments for HER2-positive metastatic breast cancer in recent years – including T-DXd, neratinib, tucatinib, and margetuximab – and [vic-]trastuzumab duocarmazine could eventually be another option.”
“At this time, there is only a minor 2-month difference in progression-free survival and a nonsignificant overall survival difference,” said Fatima Cardoso, MD, of Champalimaud Cancer Center, Lisbon, Portugal. “With the high incidence of ocular toxicity and four toxic deaths, we cannot recommend this drug for clinical practice, in my opinion.”
Dr. Manich concluded, “SYD985 can provide a new treatment option for patients with pretreated locally advanced or metastatic HER2-positive metastatic breast cancer.”
The study was funded by Byondis B.V. The authors disclosed numerous pharmaceutical-related financial interests.
This article was updated Sept. 24, 2021.
, according to Cristina Saura Manich, MD, Hospital Universitario Valle de Hebrón, Barcelona. In TULIP, trastuzumab duocarmazine (SYD985, Byondis B.V., NL) was compared with physician’s choice of chemotherapy, Dr. Saura said at the virtual European Society for Medical Oncology Congress 2021 on Sept. 18 (abstract LBA15).
Trastuzumab duocarmazine, Dr. Manich noted, is a novel HER2-targeting antibody–drug conjugate based on trastuzumab and a cleavable linker-duocarmycin (vc-seco-DUBA) payload. Its three-way mechanism of action includes uptake of the antibody–drug conjugate by internalization and intracellular release of the payload, and two bystander effects: proteolytic cleavage and subsequent release of payload in the tumor microenvironment and diffusion of active payload to neighboring tumor cells.
Two or more prior therapies for metastatic breast cancer
TULIP investigators enrolled 437 patients from 83 sites in 11 countries with HER2-positive locally advanced or metastatic breast cancer who had received two or more therapies for metastatic disease (treatment for brain metastases allowed). They were randomized 2:1 to SYD985 (1.2 mg/kg IV every 21 days [n = 291]) or physician’s choice (PC) [n = 146] of one of three trastuzumab-containing combinations or lapatinib plus capecitabine. Treatment was continued until progression or unacceptable toxicity. The primary endpoint was centrally assessed PFS.
Longer progression-free survival with SYD985
Median age was 57 years, and the median number of prior metastatic breast cancer regimens was 4.7. Centrally reviewed progression-free survival was significantly longer in the SYD985 group at 7.0 months (5.4-7.2) versus 4.9 months (4.0-5.5) for PC (hazard ratio [HR], 0.64, 95% confidence interval [CI], 0.49-0.84, P = .002). Subgroup analysis, also centrally reviewed, revealed numerical advantage for SYD985 over physician choice across all categories (except for ECOG status 2). Analysis of progression-free survival by investigators showed a similar benefit for SYD985 (6.9 months versus 4.6 months, HR, 0.60, P < .001).
A first look at median overall survival showed a nonsignificant advantage for SYD985 (20.4 months versus 16.3 months (HR, 0.83, 95% CI, 0.62-1.09, P = .153). The overall response rate (partial or complete response) was similar between groups at 27.8% for SYD985 and 29.5% for PC, with reductions in target lesion measurement at 70.2% and 32.2% for SYD985 and physician choice, respectively. The clinical benefit rates were 38.5% for SYD985 and 32.2% for physician choice.
Ocular toxicity
Most patients had at least one treatment-related adverse event (96.5% SD985, 96.4% PC), and grade 3 or higher event rates were similar between groups (52.8% SYD985, 48.2% PC). The most frequently reported adverse events for SYD985 were ocular toxicity, with conjunctivitis reported in 38.2%, and keratitis in 38.2%, with fatigue at 33.3%; for physician’s choice these were diarrhea (35.8%), nausea (31.4%), and fatigue (29.9%). Interstitial lung disease pneumonitis was reported for 7.6% (5.2% grade 1-2) of patients treated with SYD985, including two grade 5 events. Eye toxicity led to discontinuations in 20.8% of SYD985 patients, dose modifications in 22.9%, with dose modifications for interstitial lung disease/pneumonitis in 5.2% of SYD985 patients. Six fatalities (2.1%) were reported in the SYD985 group, with four attributed to treatment. Assessment of health-related quality of life showed no significant difference between groups.
Dr. Manich outlined risk mitigation strategies. Patients with prior keratitis were excluded and patients were given prophylactic lubricating eye drops and regular eye exams by ophthalmologists. Treatment was discontinued if grade 3 or higher keratitis developed, and was delayed if grade 3 conjunctivitis developed until it reduced to grade 2. Also, patients with prior pneumonitis were excluded and CT lung scans were evaluated for lung changes. New or worsening respiratory symptoms triggered a full diagnostic workup. Treatment was discontinued for grade 2 or higher pneumonitis and delayed until resolution for grade 1 pneumonitis.
Another option
“It is encouraging to observe clinically meaningful and potentially practice changing PFS improvements in patients receiving treatment in the third line and beyond,” said Aditya Bardia, MD, of Massachusetts General Hospital and Harvard Medical School, Boston. “Several agents have been approved as treatments for HER2-positive metastatic breast cancer in recent years – including T-DXd, neratinib, tucatinib, and margetuximab – and [vic-]trastuzumab duocarmazine could eventually be another option.”
“At this time, there is only a minor 2-month difference in progression-free survival and a nonsignificant overall survival difference,” said Fatima Cardoso, MD, of Champalimaud Cancer Center, Lisbon, Portugal. “With the high incidence of ocular toxicity and four toxic deaths, we cannot recommend this drug for clinical practice, in my opinion.”
Dr. Manich concluded, “SYD985 can provide a new treatment option for patients with pretreated locally advanced or metastatic HER2-positive metastatic breast cancer.”
The study was funded by Byondis B.V. The authors disclosed numerous pharmaceutical-related financial interests.
This article was updated Sept. 24, 2021.
, according to Cristina Saura Manich, MD, Hospital Universitario Valle de Hebrón, Barcelona. In TULIP, trastuzumab duocarmazine (SYD985, Byondis B.V., NL) was compared with physician’s choice of chemotherapy, Dr. Saura said at the virtual European Society for Medical Oncology Congress 2021 on Sept. 18 (abstract LBA15).
Trastuzumab duocarmazine, Dr. Manich noted, is a novel HER2-targeting antibody–drug conjugate based on trastuzumab and a cleavable linker-duocarmycin (vc-seco-DUBA) payload. Its three-way mechanism of action includes uptake of the antibody–drug conjugate by internalization and intracellular release of the payload, and two bystander effects: proteolytic cleavage and subsequent release of payload in the tumor microenvironment and diffusion of active payload to neighboring tumor cells.
Two or more prior therapies for metastatic breast cancer
TULIP investigators enrolled 437 patients from 83 sites in 11 countries with HER2-positive locally advanced or metastatic breast cancer who had received two or more therapies for metastatic disease (treatment for brain metastases allowed). They were randomized 2:1 to SYD985 (1.2 mg/kg IV every 21 days [n = 291]) or physician’s choice (PC) [n = 146] of one of three trastuzumab-containing combinations or lapatinib plus capecitabine. Treatment was continued until progression or unacceptable toxicity. The primary endpoint was centrally assessed PFS.
Longer progression-free survival with SYD985
Median age was 57 years, and the median number of prior metastatic breast cancer regimens was 4.7. Centrally reviewed progression-free survival was significantly longer in the SYD985 group at 7.0 months (5.4-7.2) versus 4.9 months (4.0-5.5) for PC (hazard ratio [HR], 0.64, 95% confidence interval [CI], 0.49-0.84, P = .002). Subgroup analysis, also centrally reviewed, revealed numerical advantage for SYD985 over physician choice across all categories (except for ECOG status 2). Analysis of progression-free survival by investigators showed a similar benefit for SYD985 (6.9 months versus 4.6 months, HR, 0.60, P < .001).
A first look at median overall survival showed a nonsignificant advantage for SYD985 (20.4 months versus 16.3 months (HR, 0.83, 95% CI, 0.62-1.09, P = .153). The overall response rate (partial or complete response) was similar between groups at 27.8% for SYD985 and 29.5% for PC, with reductions in target lesion measurement at 70.2% and 32.2% for SYD985 and physician choice, respectively. The clinical benefit rates were 38.5% for SYD985 and 32.2% for physician choice.
Ocular toxicity
Most patients had at least one treatment-related adverse event (96.5% SD985, 96.4% PC), and grade 3 or higher event rates were similar between groups (52.8% SYD985, 48.2% PC). The most frequently reported adverse events for SYD985 were ocular toxicity, with conjunctivitis reported in 38.2%, and keratitis in 38.2%, with fatigue at 33.3%; for physician’s choice these were diarrhea (35.8%), nausea (31.4%), and fatigue (29.9%). Interstitial lung disease pneumonitis was reported for 7.6% (5.2% grade 1-2) of patients treated with SYD985, including two grade 5 events. Eye toxicity led to discontinuations in 20.8% of SYD985 patients, dose modifications in 22.9%, with dose modifications for interstitial lung disease/pneumonitis in 5.2% of SYD985 patients. Six fatalities (2.1%) were reported in the SYD985 group, with four attributed to treatment. Assessment of health-related quality of life showed no significant difference between groups.
Dr. Manich outlined risk mitigation strategies. Patients with prior keratitis were excluded and patients were given prophylactic lubricating eye drops and regular eye exams by ophthalmologists. Treatment was discontinued if grade 3 or higher keratitis developed, and was delayed if grade 3 conjunctivitis developed until it reduced to grade 2. Also, patients with prior pneumonitis were excluded and CT lung scans were evaluated for lung changes. New or worsening respiratory symptoms triggered a full diagnostic workup. Treatment was discontinued for grade 2 or higher pneumonitis and delayed until resolution for grade 1 pneumonitis.
Another option
“It is encouraging to observe clinically meaningful and potentially practice changing PFS improvements in patients receiving treatment in the third line and beyond,” said Aditya Bardia, MD, of Massachusetts General Hospital and Harvard Medical School, Boston. “Several agents have been approved as treatments for HER2-positive metastatic breast cancer in recent years – including T-DXd, neratinib, tucatinib, and margetuximab – and [vic-]trastuzumab duocarmazine could eventually be another option.”
“At this time, there is only a minor 2-month difference in progression-free survival and a nonsignificant overall survival difference,” said Fatima Cardoso, MD, of Champalimaud Cancer Center, Lisbon, Portugal. “With the high incidence of ocular toxicity and four toxic deaths, we cannot recommend this drug for clinical practice, in my opinion.”
Dr. Manich concluded, “SYD985 can provide a new treatment option for patients with pretreated locally advanced or metastatic HER2-positive metastatic breast cancer.”
The study was funded by Byondis B.V. The authors disclosed numerous pharmaceutical-related financial interests.
This article was updated Sept. 24, 2021.
FROM ESMO 2021
Study supports add-on therapy for germline and wildtype BRCA mutations
The initial improvement that was seen in pathologic complete response (pCR) rates with the addition of carboplatin to paclitaxel and standard neoadjuvant chemotherapy translated into improved event-free survival (EFS) rates in patients with resectable TNBC more than 4 years after surgery.
The benefits of adding carboplatin to paclitaxel, followed by four cycles of AC (doxorubicin and cyclophosphamide) chemotherapy, were seen both in patients with germline BRCA mutations and those with wildtype BRCA.
The trial results also demonstrated, however, that there were no short- or long-term benefits to adding veliparib (ABT-888), a poly (ADP-ribose) polymerase (PARP) inhibitor, to the mix.
Although pCR and EFS rates were significantly improved with the combination of paclitaxel and carboplatin compared with paclitaxel alone, there were no significant differences when veliparib was added in either pCR, EFS, or overall survival (OS).
“These findings overall support the inclusion of carboplatin into neoadjuvant chemotherapy for stage 2 and 3 triple-negative breast cancer patients, regardless of germline BRCA status,” concluded lead author Sibylle Loibl, MD, PhD, chief executive officer and chair of the German Breast Group.
She presented the new data during an oral session at the virtual European Society for Medical Oncology (ESMO) Congress 2021.
The BrighTNess results show that “neoadjuvant carboplatin plus paclitaxel is superior to paclitaxel alone, with high pCR rates and benefit of event-free survival rates with manageable toxicity and no safety signals,” commented invited discussant Monica Arnedos, MD, PhD, head of the breast cancer research program at the Institut Bergonié in Bordeaux, France.
The findings also put to rest the notion that patients with germline BRCA mutations would not benefit from carboplatin treatment because of extreme sensitivity to standard neoadjuvant chemotherapy.
“The BrighTNess study says otherwise,” Dr. Arnedos said. “Today we’ve seen that the pCR improved event-free survival regardless of the germline BRCA mutated status, so BRCA-mutated germline patients require neoadjuvant carboplatin.”
The new data may lead to changes in breast cancer guidelines, she suggested.
Prior to these results, the evidence was that “platinum salts as neoadjuvant chemotherapy increased pCR rates in triple-negative breast cancer patients, but this was associated with more toxicity, and with higher rates of treatment discontinuation and dose reduction, without strong evidence of long-term benefit. This led to a lack of consensus to recommend platinum salts in this setting between the different breast cancer guidelines.”
The new BrighTNess data showed that the improved pCR rates translated into an EFS benefit in both platinum-containing groups of the trial, a finding that is consistent with the KEYNOTE-522 trial, which showed that adding pembrolizumab (Keytruda) to chemotherapy improved pCR in patients with early TNBC.
The BrighTNess results suggest that patients with high- or moderate-risk TNBC could be treated in the neoadjuvant setting with paclitaxel and carboplatin followed by standard chemotherapy concurrently with pembrolizumab, followed by surgery, and adjuvant therapy with pembrolizumab plus olaparib (Lynparza) for patients with germline BRCA mutations, or capecitabine for patients without mutations, Dr. Arnedos proposed.
BrighTNess study details
The BrighTNess trial involved 634 patients with previously untreated histologically or cytologically confirmed stage 2-3 TNBC who were candidates for potentially curative surgery and had a good performance status. They were randomly assigned to receive either paclitaxel plus carboplatin and veliparib, paclitaxel plus carboplatin only, or paclitaxel alone prior to four cycles of chemotherapy with doxorubicin and cyclophosphamide (AC).
Initial results, published in 2018 in The Lancet Oncology, showed that the addition of veliparib to carboplatin and paclitaxel improved pCR rates compared with paclitaxel alone but not paclitaxel plus carboplatin. The trial data supported the addition of carboplatin to standard neoadjuvant chemotherapy but not veliparib, the investigators stated at the time.
Now at the ESMO meeting, Dr. Loibl presented longer follow-up results.
After a median follow-up of 4.5 years, the hazard ratio (HR) for event-free survival with the paclitaxel/carboplatin/veliparib combination compared with paclitaxel alone was 0.63 (P = .016). In a post-hoc analysis, the adjusted HR was 0.57 (P = .018).
In a subgroup of 309 patients who had initial pCRs, the HR for EFS compared with patients without a pCR was 0.26 (P < .0001). Among patients with germline BRCA mutation, the HR for EFS for those who had a pCR was 0.14 (P = .0004), and among those with germline wildtype BRCA and a pCR the HR was 0.29 (P < .0001).
However, there were no significant differences in OS a median of 4.5 years after surgery.
An analysis of the frequency of myelodysplastic syndrome, acute myeloid leukemia, or other second primary malignancies also showed no significant differences between the groups, Dr. Loibl noted.
Although there were higher rates of hematologic malignancies with the addition of carboplatin, with or without veliparib, these adverse events did not compromise either treatment delivery of the benefits of carboplatin on the primary pCR endpoint, she added.
The BrighTNess trial was supported by AbbVie. Dr. Loibl has reported receiving grants and honoraria from AbbVie and others, including Medscape. Dr. Arnedos has reported receiving honoraria, travel grants, and/or research grants from AstraZeneca, Novartis, Pfizer, and Roche.
A version of this article first appeared on Medscape.com.
The initial improvement that was seen in pathologic complete response (pCR) rates with the addition of carboplatin to paclitaxel and standard neoadjuvant chemotherapy translated into improved event-free survival (EFS) rates in patients with resectable TNBC more than 4 years after surgery.
The benefits of adding carboplatin to paclitaxel, followed by four cycles of AC (doxorubicin and cyclophosphamide) chemotherapy, were seen both in patients with germline BRCA mutations and those with wildtype BRCA.
The trial results also demonstrated, however, that there were no short- or long-term benefits to adding veliparib (ABT-888), a poly (ADP-ribose) polymerase (PARP) inhibitor, to the mix.
Although pCR and EFS rates were significantly improved with the combination of paclitaxel and carboplatin compared with paclitaxel alone, there were no significant differences when veliparib was added in either pCR, EFS, or overall survival (OS).
“These findings overall support the inclusion of carboplatin into neoadjuvant chemotherapy for stage 2 and 3 triple-negative breast cancer patients, regardless of germline BRCA status,” concluded lead author Sibylle Loibl, MD, PhD, chief executive officer and chair of the German Breast Group.
She presented the new data during an oral session at the virtual European Society for Medical Oncology (ESMO) Congress 2021.
The BrighTNess results show that “neoadjuvant carboplatin plus paclitaxel is superior to paclitaxel alone, with high pCR rates and benefit of event-free survival rates with manageable toxicity and no safety signals,” commented invited discussant Monica Arnedos, MD, PhD, head of the breast cancer research program at the Institut Bergonié in Bordeaux, France.
The findings also put to rest the notion that patients with germline BRCA mutations would not benefit from carboplatin treatment because of extreme sensitivity to standard neoadjuvant chemotherapy.
“The BrighTNess study says otherwise,” Dr. Arnedos said. “Today we’ve seen that the pCR improved event-free survival regardless of the germline BRCA mutated status, so BRCA-mutated germline patients require neoadjuvant carboplatin.”
The new data may lead to changes in breast cancer guidelines, she suggested.
Prior to these results, the evidence was that “platinum salts as neoadjuvant chemotherapy increased pCR rates in triple-negative breast cancer patients, but this was associated with more toxicity, and with higher rates of treatment discontinuation and dose reduction, without strong evidence of long-term benefit. This led to a lack of consensus to recommend platinum salts in this setting between the different breast cancer guidelines.”
The new BrighTNess data showed that the improved pCR rates translated into an EFS benefit in both platinum-containing groups of the trial, a finding that is consistent with the KEYNOTE-522 trial, which showed that adding pembrolizumab (Keytruda) to chemotherapy improved pCR in patients with early TNBC.
The BrighTNess results suggest that patients with high- or moderate-risk TNBC could be treated in the neoadjuvant setting with paclitaxel and carboplatin followed by standard chemotherapy concurrently with pembrolizumab, followed by surgery, and adjuvant therapy with pembrolizumab plus olaparib (Lynparza) for patients with germline BRCA mutations, or capecitabine for patients without mutations, Dr. Arnedos proposed.
BrighTNess study details
The BrighTNess trial involved 634 patients with previously untreated histologically or cytologically confirmed stage 2-3 TNBC who were candidates for potentially curative surgery and had a good performance status. They were randomly assigned to receive either paclitaxel plus carboplatin and veliparib, paclitaxel plus carboplatin only, or paclitaxel alone prior to four cycles of chemotherapy with doxorubicin and cyclophosphamide (AC).
Initial results, published in 2018 in The Lancet Oncology, showed that the addition of veliparib to carboplatin and paclitaxel improved pCR rates compared with paclitaxel alone but not paclitaxel plus carboplatin. The trial data supported the addition of carboplatin to standard neoadjuvant chemotherapy but not veliparib, the investigators stated at the time.
Now at the ESMO meeting, Dr. Loibl presented longer follow-up results.
After a median follow-up of 4.5 years, the hazard ratio (HR) for event-free survival with the paclitaxel/carboplatin/veliparib combination compared with paclitaxel alone was 0.63 (P = .016). In a post-hoc analysis, the adjusted HR was 0.57 (P = .018).
In a subgroup of 309 patients who had initial pCRs, the HR for EFS compared with patients without a pCR was 0.26 (P < .0001). Among patients with germline BRCA mutation, the HR for EFS for those who had a pCR was 0.14 (P = .0004), and among those with germline wildtype BRCA and a pCR the HR was 0.29 (P < .0001).
However, there were no significant differences in OS a median of 4.5 years after surgery.
An analysis of the frequency of myelodysplastic syndrome, acute myeloid leukemia, or other second primary malignancies also showed no significant differences between the groups, Dr. Loibl noted.
Although there were higher rates of hematologic malignancies with the addition of carboplatin, with or without veliparib, these adverse events did not compromise either treatment delivery of the benefits of carboplatin on the primary pCR endpoint, she added.
The BrighTNess trial was supported by AbbVie. Dr. Loibl has reported receiving grants and honoraria from AbbVie and others, including Medscape. Dr. Arnedos has reported receiving honoraria, travel grants, and/or research grants from AstraZeneca, Novartis, Pfizer, and Roche.
A version of this article first appeared on Medscape.com.
The initial improvement that was seen in pathologic complete response (pCR) rates with the addition of carboplatin to paclitaxel and standard neoadjuvant chemotherapy translated into improved event-free survival (EFS) rates in patients with resectable TNBC more than 4 years after surgery.
The benefits of adding carboplatin to paclitaxel, followed by four cycles of AC (doxorubicin and cyclophosphamide) chemotherapy, were seen both in patients with germline BRCA mutations and those with wildtype BRCA.
The trial results also demonstrated, however, that there were no short- or long-term benefits to adding veliparib (ABT-888), a poly (ADP-ribose) polymerase (PARP) inhibitor, to the mix.
Although pCR and EFS rates were significantly improved with the combination of paclitaxel and carboplatin compared with paclitaxel alone, there were no significant differences when veliparib was added in either pCR, EFS, or overall survival (OS).
“These findings overall support the inclusion of carboplatin into neoadjuvant chemotherapy for stage 2 and 3 triple-negative breast cancer patients, regardless of germline BRCA status,” concluded lead author Sibylle Loibl, MD, PhD, chief executive officer and chair of the German Breast Group.
She presented the new data during an oral session at the virtual European Society for Medical Oncology (ESMO) Congress 2021.
The BrighTNess results show that “neoadjuvant carboplatin plus paclitaxel is superior to paclitaxel alone, with high pCR rates and benefit of event-free survival rates with manageable toxicity and no safety signals,” commented invited discussant Monica Arnedos, MD, PhD, head of the breast cancer research program at the Institut Bergonié in Bordeaux, France.
The findings also put to rest the notion that patients with germline BRCA mutations would not benefit from carboplatin treatment because of extreme sensitivity to standard neoadjuvant chemotherapy.
“The BrighTNess study says otherwise,” Dr. Arnedos said. “Today we’ve seen that the pCR improved event-free survival regardless of the germline BRCA mutated status, so BRCA-mutated germline patients require neoadjuvant carboplatin.”
The new data may lead to changes in breast cancer guidelines, she suggested.
Prior to these results, the evidence was that “platinum salts as neoadjuvant chemotherapy increased pCR rates in triple-negative breast cancer patients, but this was associated with more toxicity, and with higher rates of treatment discontinuation and dose reduction, without strong evidence of long-term benefit. This led to a lack of consensus to recommend platinum salts in this setting between the different breast cancer guidelines.”
The new BrighTNess data showed that the improved pCR rates translated into an EFS benefit in both platinum-containing groups of the trial, a finding that is consistent with the KEYNOTE-522 trial, which showed that adding pembrolizumab (Keytruda) to chemotherapy improved pCR in patients with early TNBC.
The BrighTNess results suggest that patients with high- or moderate-risk TNBC could be treated in the neoadjuvant setting with paclitaxel and carboplatin followed by standard chemotherapy concurrently with pembrolizumab, followed by surgery, and adjuvant therapy with pembrolizumab plus olaparib (Lynparza) for patients with germline BRCA mutations, or capecitabine for patients without mutations, Dr. Arnedos proposed.
BrighTNess study details
The BrighTNess trial involved 634 patients with previously untreated histologically or cytologically confirmed stage 2-3 TNBC who were candidates for potentially curative surgery and had a good performance status. They were randomly assigned to receive either paclitaxel plus carboplatin and veliparib, paclitaxel plus carboplatin only, or paclitaxel alone prior to four cycles of chemotherapy with doxorubicin and cyclophosphamide (AC).
Initial results, published in 2018 in The Lancet Oncology, showed that the addition of veliparib to carboplatin and paclitaxel improved pCR rates compared with paclitaxel alone but not paclitaxel plus carboplatin. The trial data supported the addition of carboplatin to standard neoadjuvant chemotherapy but not veliparib, the investigators stated at the time.
Now at the ESMO meeting, Dr. Loibl presented longer follow-up results.
After a median follow-up of 4.5 years, the hazard ratio (HR) for event-free survival with the paclitaxel/carboplatin/veliparib combination compared with paclitaxel alone was 0.63 (P = .016). In a post-hoc analysis, the adjusted HR was 0.57 (P = .018).
In a subgroup of 309 patients who had initial pCRs, the HR for EFS compared with patients without a pCR was 0.26 (P < .0001). Among patients with germline BRCA mutation, the HR for EFS for those who had a pCR was 0.14 (P = .0004), and among those with germline wildtype BRCA and a pCR the HR was 0.29 (P < .0001).
However, there were no significant differences in OS a median of 4.5 years after surgery.
An analysis of the frequency of myelodysplastic syndrome, acute myeloid leukemia, or other second primary malignancies also showed no significant differences between the groups, Dr. Loibl noted.
Although there were higher rates of hematologic malignancies with the addition of carboplatin, with or without veliparib, these adverse events did not compromise either treatment delivery of the benefits of carboplatin on the primary pCR endpoint, she added.
The BrighTNess trial was supported by AbbVie. Dr. Loibl has reported receiving grants and honoraria from AbbVie and others, including Medscape. Dr. Arnedos has reported receiving honoraria, travel grants, and/or research grants from AstraZeneca, Novartis, Pfizer, and Roche.
A version of this article first appeared on Medscape.com.
Twelve-month overall survival benefit with ribociclib for metastatic breast cancer
“Based on these results, ribociclib and letrozole should be considered the preferred treatment option,” said lead investigator Gabriel N. Hortobagyi, MD, a breast cancer medical oncologist at the University of Texas MD Anderson Cancer Center, Houston.
He presented the definitive overall survival results from MONALESSA-2 which randomized 668 patients equally and in the first line to either ribociclib or placebo on a background of standard dose letrozole.
At a median follow up of 6.6 years, median overall survival with ribociclib was 63.9 months versus 51.4 months in the placebo arm, a 24% reduction in the relative risk of death (P = .004).
It was the first report of a median overall survival (OS) exceeding 5 years in a phase 3 trial for advanced breast cancer. The estimated 6-year OS rate was 44.2% for ribociclib versus 32.0% with placebo.
“These are really impressive results” and support the use of CDK 4/6 inhibitors in the front-line setting,” said study discussant Gonzalo Gomez Abuin, MD, a medical oncologist at Hospital Alemán in Bueno Aires.
Ribociclib and other CDK 4/6 inhibitors have shown consistent progression-free survival benefit for metastatic disease, but ribociclib is the first of the major phase 3 trials with definitive overall survival results. They have “been long awaited,” Dr. Abuin said.
The overall survival benefit in MONALESSA-2 began to emerge at around 20 months and continued to increase over time.
Women had no prior CDK4/6 inhibitor treatment, chemotherapy, or endocrine therapy for metastatic disease. “They represented a pure first-line population,” Dr. Hortobagyi said.
Among other benefits, the time to first chemotherapy was a median of 50.6 months with ribociclib versus 38.9 months with placebo, so patients “had an extra year of delay before chemotherapy was utilized,” he said.
In general, Dr. Abuin said, we “see a consistent benefit with CDK 4/6 inhibitors in metastatic breast cancer across different settings.”
However, “it’s a little intriguing” that in a subgroup analysis of non–de novo disease, the overall survival benefit with ribociclib had a hazard ratio of 0.91, whereas the progression-free survival benefit was robust and statistically significant in an earlier report.
“This has been an important question, but I would caution all of us not to make too much out of the forest plot,” Dr. Hortobagyi said.
“There are a number of hypotheses one could come up with that could explain why the de novo and non–de novo populations faired differently in overall survival as opposed to progression-free survival, but there is also the simple possibility that this is a statistical fluke,” he said.
“We are in the process of analyzing this particular observation. In the meantime, I think we should just take the overall survival results of the entire population as the lead answer, and not follow the subgroup analysis until further information is available,” Dr. Hortobagyi said.
No new ribociclib safety signals were observed in the trial. The most common adverse events were neutropenia and liver function abnormalities, but they were “largely asymptomatic laboratory findings and completely reversible,” he said.
Twice as many patients treated with ribociclib developed prolonged QT intervals, but again, “no clinical consequences of this EKG finding were detected,” Dr. Hortobagyi said.
Less than 1% of patients in the ribociclib arm developed interstitial lung disease. The majority of safety events occurred in the first 12 months of treatment.
The work was funded by Novartis, maker of both ribociclib and letrozole. Dr. Hortobagyi reported receiving an institutional grant from the company and personal fees related to the trial. Other investigators disclosed ties to Novartis. Dr. Abuin reported relationships with many companies, including Novartis.
This article was updated 9/24/21.
“Based on these results, ribociclib and letrozole should be considered the preferred treatment option,” said lead investigator Gabriel N. Hortobagyi, MD, a breast cancer medical oncologist at the University of Texas MD Anderson Cancer Center, Houston.
He presented the definitive overall survival results from MONALESSA-2 which randomized 668 patients equally and in the first line to either ribociclib or placebo on a background of standard dose letrozole.
At a median follow up of 6.6 years, median overall survival with ribociclib was 63.9 months versus 51.4 months in the placebo arm, a 24% reduction in the relative risk of death (P = .004).
It was the first report of a median overall survival (OS) exceeding 5 years in a phase 3 trial for advanced breast cancer. The estimated 6-year OS rate was 44.2% for ribociclib versus 32.0% with placebo.
“These are really impressive results” and support the use of CDK 4/6 inhibitors in the front-line setting,” said study discussant Gonzalo Gomez Abuin, MD, a medical oncologist at Hospital Alemán in Bueno Aires.
Ribociclib and other CDK 4/6 inhibitors have shown consistent progression-free survival benefit for metastatic disease, but ribociclib is the first of the major phase 3 trials with definitive overall survival results. They have “been long awaited,” Dr. Abuin said.
The overall survival benefit in MONALESSA-2 began to emerge at around 20 months and continued to increase over time.
Women had no prior CDK4/6 inhibitor treatment, chemotherapy, or endocrine therapy for metastatic disease. “They represented a pure first-line population,” Dr. Hortobagyi said.
Among other benefits, the time to first chemotherapy was a median of 50.6 months with ribociclib versus 38.9 months with placebo, so patients “had an extra year of delay before chemotherapy was utilized,” he said.
In general, Dr. Abuin said, we “see a consistent benefit with CDK 4/6 inhibitors in metastatic breast cancer across different settings.”
However, “it’s a little intriguing” that in a subgroup analysis of non–de novo disease, the overall survival benefit with ribociclib had a hazard ratio of 0.91, whereas the progression-free survival benefit was robust and statistically significant in an earlier report.
“This has been an important question, but I would caution all of us not to make too much out of the forest plot,” Dr. Hortobagyi said.
“There are a number of hypotheses one could come up with that could explain why the de novo and non–de novo populations faired differently in overall survival as opposed to progression-free survival, but there is also the simple possibility that this is a statistical fluke,” he said.
“We are in the process of analyzing this particular observation. In the meantime, I think we should just take the overall survival results of the entire population as the lead answer, and not follow the subgroup analysis until further information is available,” Dr. Hortobagyi said.
No new ribociclib safety signals were observed in the trial. The most common adverse events were neutropenia and liver function abnormalities, but they were “largely asymptomatic laboratory findings and completely reversible,” he said.
Twice as many patients treated with ribociclib developed prolonged QT intervals, but again, “no clinical consequences of this EKG finding were detected,” Dr. Hortobagyi said.
Less than 1% of patients in the ribociclib arm developed interstitial lung disease. The majority of safety events occurred in the first 12 months of treatment.
The work was funded by Novartis, maker of both ribociclib and letrozole. Dr. Hortobagyi reported receiving an institutional grant from the company and personal fees related to the trial. Other investigators disclosed ties to Novartis. Dr. Abuin reported relationships with many companies, including Novartis.
This article was updated 9/24/21.
“Based on these results, ribociclib and letrozole should be considered the preferred treatment option,” said lead investigator Gabriel N. Hortobagyi, MD, a breast cancer medical oncologist at the University of Texas MD Anderson Cancer Center, Houston.
He presented the definitive overall survival results from MONALESSA-2 which randomized 668 patients equally and in the first line to either ribociclib or placebo on a background of standard dose letrozole.
At a median follow up of 6.6 years, median overall survival with ribociclib was 63.9 months versus 51.4 months in the placebo arm, a 24% reduction in the relative risk of death (P = .004).
It was the first report of a median overall survival (OS) exceeding 5 years in a phase 3 trial for advanced breast cancer. The estimated 6-year OS rate was 44.2% for ribociclib versus 32.0% with placebo.
“These are really impressive results” and support the use of CDK 4/6 inhibitors in the front-line setting,” said study discussant Gonzalo Gomez Abuin, MD, a medical oncologist at Hospital Alemán in Bueno Aires.
Ribociclib and other CDK 4/6 inhibitors have shown consistent progression-free survival benefit for metastatic disease, but ribociclib is the first of the major phase 3 trials with definitive overall survival results. They have “been long awaited,” Dr. Abuin said.
The overall survival benefit in MONALESSA-2 began to emerge at around 20 months and continued to increase over time.
Women had no prior CDK4/6 inhibitor treatment, chemotherapy, or endocrine therapy for metastatic disease. “They represented a pure first-line population,” Dr. Hortobagyi said.
Among other benefits, the time to first chemotherapy was a median of 50.6 months with ribociclib versus 38.9 months with placebo, so patients “had an extra year of delay before chemotherapy was utilized,” he said.
In general, Dr. Abuin said, we “see a consistent benefit with CDK 4/6 inhibitors in metastatic breast cancer across different settings.”
However, “it’s a little intriguing” that in a subgroup analysis of non–de novo disease, the overall survival benefit with ribociclib had a hazard ratio of 0.91, whereas the progression-free survival benefit was robust and statistically significant in an earlier report.
“This has been an important question, but I would caution all of us not to make too much out of the forest plot,” Dr. Hortobagyi said.
“There are a number of hypotheses one could come up with that could explain why the de novo and non–de novo populations faired differently in overall survival as opposed to progression-free survival, but there is also the simple possibility that this is a statistical fluke,” he said.
“We are in the process of analyzing this particular observation. In the meantime, I think we should just take the overall survival results of the entire population as the lead answer, and not follow the subgroup analysis until further information is available,” Dr. Hortobagyi said.
No new ribociclib safety signals were observed in the trial. The most common adverse events were neutropenia and liver function abnormalities, but they were “largely asymptomatic laboratory findings and completely reversible,” he said.
Twice as many patients treated with ribociclib developed prolonged QT intervals, but again, “no clinical consequences of this EKG finding were detected,” Dr. Hortobagyi said.
Less than 1% of patients in the ribociclib arm developed interstitial lung disease. The majority of safety events occurred in the first 12 months of treatment.
The work was funded by Novartis, maker of both ribociclib and letrozole. Dr. Hortobagyi reported receiving an institutional grant from the company and personal fees related to the trial. Other investigators disclosed ties to Novartis. Dr. Abuin reported relationships with many companies, including Novartis.
This article was updated 9/24/21.
FROM ESMO 2021
Call for a move or boycott of big Texas cancer meeting
Docs won’t attend in person
Held annually in December, SABCS is the world’s largest breast cancer meeting and welcomes thousands of attendees every year.
The law banning abortions after 6 weeks, at which time a woman may not even realize that she is pregnant, has been described as the most restrictive in the United States. It also enables private citizens to bring civil lawsuits against people who assist a pregnant person seeking an abortion in violation of the ban.
If the meeting remains in Texas this year, then UCSF’s Laura Esserman, MD, director of the Carol Franc Buck Breast Cancer Center, has said that she and other university faculty and professionals from elsewhere will attend only online — a form of boycotting the in-person event.
Dr. Esserman and UCSF colleague Mary Helen Barcellos-Hoff, PhD, professor of radiation oncology, have emailed conference leaders encouraging them to move the meeting, according to a press statement issued by UCSF.
SABCS organizers told this news organization via email that they “are having serious discussions about this matter” and will update the public via their website and social media channels.
“It’s a terrible law, and it is absolutely not protective of women. I think that if Texas officials understood that when they pass laws inhospitable to women, we will not hold a major conference about women’s health in their state,” said Dr. Esserman.
Dr. Esserman received support for the idea to move the meeting earlier this month from peers on Twitter.
“In light of the Texas law that prohibits abortion past 6 weeks of pregnancy AND promotes vigilantism, directly harming women and their caregivers, the 2021 SABCS breast cancer meeting should be moved out of Texas to a place that supports Women’s rights and public health #sabcs,” tweeted Dr. Esserman on September 5.
The post generated more than 3,300 likes and retweets and 40-plus comments from readers, many of whom were healthcare professionals.
Supporters of the proposed move included Michael Feldman, MD, PhD, pathologist, University of Pennsylvania in Philadelphia; Sarah Sammons, MD, breast medical oncologist, Duke Cancer Center, Durham, N.C.; Anjali Thawani, MD, breast surgeon, Evanston, Ill.; Debora Barton, MD, Carisma Therapeutics, Philadelphia; Jane Hui, MD, surgical oncologist, University of Minnesota, Minneapolis; Erica Leith Mitchell, MD, surgeon, University of Tennessee, Memphis; and Rebecca Shatsky, MD, breast medical oncologist, University of California, San Diego.
Support for boycotting in-person attendance is growing nationally, Dr. Esserman said in the press statement, which also highlighted an “additional concern” about Texas laws prohibiting mandated masking and asking for vaccine status. Conference organizers said local ordinances will be used to require masking.
Notably, a Twitter search using #SABCS21, the meeting’s hashtag, indicates that COVID 19 — and not the restrictive abortion law — is the primary worry of would-be meeting attendees as of the last week or so.
Some said the combination of the two issues was influential in their decision not to attend in person.
Kelly Shanahan, MD, a former ob/gyn living with metastatic breast cancer in South Lake Tahoe, Calif., tweeted: “It’s a hybrid model this year. I was originally going in person but will not now because of their COVID behaviors and now this [the abortion law]. I will tune in virtually but I will not spend the $1500 on the hotel room, the hundreds of $$ on food and drink and Xmas presents. #SayNoToTX #SABCS21.”
Dr. Shanahan also replied to Dr. Esserman’s move-the-meeting-out-of-Texas tweet: “100% agree.”
UCSF’s Dr. Barcellos-Hoff believes moving the meeting would be a high-profile happening. “I think moving a meeting of that size would have an impact, largely because of the visibility of scientists who oppose the law.”
First organized in 1977, SABCS is jointly sponsored by the Cancer Therapy & Research Center at The University of Texas Health Science Center at San Antonio, the American Association for Cancer Research, and Baylor College of Medicine.
A version of this article first appeared on Medscape.com.
Docs won’t attend in person
Docs won’t attend in person
Held annually in December, SABCS is the world’s largest breast cancer meeting and welcomes thousands of attendees every year.
The law banning abortions after 6 weeks, at which time a woman may not even realize that she is pregnant, has been described as the most restrictive in the United States. It also enables private citizens to bring civil lawsuits against people who assist a pregnant person seeking an abortion in violation of the ban.
If the meeting remains in Texas this year, then UCSF’s Laura Esserman, MD, director of the Carol Franc Buck Breast Cancer Center, has said that she and other university faculty and professionals from elsewhere will attend only online — a form of boycotting the in-person event.
Dr. Esserman and UCSF colleague Mary Helen Barcellos-Hoff, PhD, professor of radiation oncology, have emailed conference leaders encouraging them to move the meeting, according to a press statement issued by UCSF.
SABCS organizers told this news organization via email that they “are having serious discussions about this matter” and will update the public via their website and social media channels.
“It’s a terrible law, and it is absolutely not protective of women. I think that if Texas officials understood that when they pass laws inhospitable to women, we will not hold a major conference about women’s health in their state,” said Dr. Esserman.
Dr. Esserman received support for the idea to move the meeting earlier this month from peers on Twitter.
“In light of the Texas law that prohibits abortion past 6 weeks of pregnancy AND promotes vigilantism, directly harming women and their caregivers, the 2021 SABCS breast cancer meeting should be moved out of Texas to a place that supports Women’s rights and public health #sabcs,” tweeted Dr. Esserman on September 5.
The post generated more than 3,300 likes and retweets and 40-plus comments from readers, many of whom were healthcare professionals.
Supporters of the proposed move included Michael Feldman, MD, PhD, pathologist, University of Pennsylvania in Philadelphia; Sarah Sammons, MD, breast medical oncologist, Duke Cancer Center, Durham, N.C.; Anjali Thawani, MD, breast surgeon, Evanston, Ill.; Debora Barton, MD, Carisma Therapeutics, Philadelphia; Jane Hui, MD, surgical oncologist, University of Minnesota, Minneapolis; Erica Leith Mitchell, MD, surgeon, University of Tennessee, Memphis; and Rebecca Shatsky, MD, breast medical oncologist, University of California, San Diego.
Support for boycotting in-person attendance is growing nationally, Dr. Esserman said in the press statement, which also highlighted an “additional concern” about Texas laws prohibiting mandated masking and asking for vaccine status. Conference organizers said local ordinances will be used to require masking.
Notably, a Twitter search using #SABCS21, the meeting’s hashtag, indicates that COVID 19 — and not the restrictive abortion law — is the primary worry of would-be meeting attendees as of the last week or so.
Some said the combination of the two issues was influential in their decision not to attend in person.
Kelly Shanahan, MD, a former ob/gyn living with metastatic breast cancer in South Lake Tahoe, Calif., tweeted: “It’s a hybrid model this year. I was originally going in person but will not now because of their COVID behaviors and now this [the abortion law]. I will tune in virtually but I will not spend the $1500 on the hotel room, the hundreds of $$ on food and drink and Xmas presents. #SayNoToTX #SABCS21.”
Dr. Shanahan also replied to Dr. Esserman’s move-the-meeting-out-of-Texas tweet: “100% agree.”
UCSF’s Dr. Barcellos-Hoff believes moving the meeting would be a high-profile happening. “I think moving a meeting of that size would have an impact, largely because of the visibility of scientists who oppose the law.”
First organized in 1977, SABCS is jointly sponsored by the Cancer Therapy & Research Center at The University of Texas Health Science Center at San Antonio, the American Association for Cancer Research, and Baylor College of Medicine.
A version of this article first appeared on Medscape.com.
Held annually in December, SABCS is the world’s largest breast cancer meeting and welcomes thousands of attendees every year.
The law banning abortions after 6 weeks, at which time a woman may not even realize that she is pregnant, has been described as the most restrictive in the United States. It also enables private citizens to bring civil lawsuits against people who assist a pregnant person seeking an abortion in violation of the ban.
If the meeting remains in Texas this year, then UCSF’s Laura Esserman, MD, director of the Carol Franc Buck Breast Cancer Center, has said that she and other university faculty and professionals from elsewhere will attend only online — a form of boycotting the in-person event.
Dr. Esserman and UCSF colleague Mary Helen Barcellos-Hoff, PhD, professor of radiation oncology, have emailed conference leaders encouraging them to move the meeting, according to a press statement issued by UCSF.
SABCS organizers told this news organization via email that they “are having serious discussions about this matter” and will update the public via their website and social media channels.
“It’s a terrible law, and it is absolutely not protective of women. I think that if Texas officials understood that when they pass laws inhospitable to women, we will not hold a major conference about women’s health in their state,” said Dr. Esserman.
Dr. Esserman received support for the idea to move the meeting earlier this month from peers on Twitter.
“In light of the Texas law that prohibits abortion past 6 weeks of pregnancy AND promotes vigilantism, directly harming women and their caregivers, the 2021 SABCS breast cancer meeting should be moved out of Texas to a place that supports Women’s rights and public health #sabcs,” tweeted Dr. Esserman on September 5.
The post generated more than 3,300 likes and retweets and 40-plus comments from readers, many of whom were healthcare professionals.
Supporters of the proposed move included Michael Feldman, MD, PhD, pathologist, University of Pennsylvania in Philadelphia; Sarah Sammons, MD, breast medical oncologist, Duke Cancer Center, Durham, N.C.; Anjali Thawani, MD, breast surgeon, Evanston, Ill.; Debora Barton, MD, Carisma Therapeutics, Philadelphia; Jane Hui, MD, surgical oncologist, University of Minnesota, Minneapolis; Erica Leith Mitchell, MD, surgeon, University of Tennessee, Memphis; and Rebecca Shatsky, MD, breast medical oncologist, University of California, San Diego.
Support for boycotting in-person attendance is growing nationally, Dr. Esserman said in the press statement, which also highlighted an “additional concern” about Texas laws prohibiting mandated masking and asking for vaccine status. Conference organizers said local ordinances will be used to require masking.
Notably, a Twitter search using #SABCS21, the meeting’s hashtag, indicates that COVID 19 — and not the restrictive abortion law — is the primary worry of would-be meeting attendees as of the last week or so.
Some said the combination of the two issues was influential in their decision not to attend in person.
Kelly Shanahan, MD, a former ob/gyn living with metastatic breast cancer in South Lake Tahoe, Calif., tweeted: “It’s a hybrid model this year. I was originally going in person but will not now because of their COVID behaviors and now this [the abortion law]. I will tune in virtually but I will not spend the $1500 on the hotel room, the hundreds of $$ on food and drink and Xmas presents. #SayNoToTX #SABCS21.”
Dr. Shanahan also replied to Dr. Esserman’s move-the-meeting-out-of-Texas tweet: “100% agree.”
UCSF’s Dr. Barcellos-Hoff believes moving the meeting would be a high-profile happening. “I think moving a meeting of that size would have an impact, largely because of the visibility of scientists who oppose the law.”
First organized in 1977, SABCS is jointly sponsored by the Cancer Therapy & Research Center at The University of Texas Health Science Center at San Antonio, the American Association for Cancer Research, and Baylor College of Medicine.
A version of this article first appeared on Medscape.com.
Patients panic as docs cut off breast cancer drug
The discontinuance appears to be in reaction to an announcement by the manufacturer (Genentech) in late August that it has voluntarily withdrawn its application for accelerated approval of the drug for use in metastatic triple-negative breast cancer (mTNBC).
However, experts stress that discontinuing atezolizumab is not advised if a patient is responding to or is stable on the immune checkpoint inhibitor.
“I think the Genentech announcement has been misinterpreted,” Maryam Lustberg, MD, of Yale Cancer Center, New Haven, Conn., said in an interview. “The consensus opinion from all academic breast oncologists is that people should not be switching off atezolizumab if they are responding. They should not be changing their immunotherapy.”
Dr. Lustberg said the announcement had two major points: “don’t start a new patient on atezolizumab,” and the company is “committed” to supplying the drug to patients whose conditions are stable or responding.
Nevertheless, some patients with mTNBC were recently in a state of escalating emotional upset, said one patient advocate.
“The level of panic among those currently on & responding well to Atezo is growing quickly,” tweeted Janice Cowden on Sept. 5, a former nurse living with mTNBC in Bradenton, Fla.
Ms. Cowden explained that “at least 10-20 patients” were “pulled [off the drug by their oncologists] this past week who have been stable/no evidence of disease/no evidence of disease activity on Tecentriq.”
She estimated that as many as 50 patients in the 2,200-member Triple Negative BC Stage 4 Facebook group who have been responding to the drug were abruptly de-prescribed atezolizumab since the Aug. 27 announcement from Genentech.
Many women learned of the change via patient portals or text messaging, not directly from their physicians, Cowden told Medscape Medical News.
Some of the women had been taking atezolizumab for 2-3 years, including those with no evidence of disease, she said. “Finding out that their oncologist was discontinuing a treatment that was working for them has been driving so much anxiety and stress,” Ms. Cowden emphasized.
Most market withdrawals of drugs are related to safety, but that is not the case with atezolizumab, said Sara Horton, MD, of Howard University, Washington. She was speaking at the recent Facebook webinar on atezolizumab and mTNBC that was sponsored by the TNBC Foundation and the Young Survivors Coalition.
In the case of atezolizumab, it was a question about efficacy that prompted the withdrawal. After the indication was granted an accelerated approval on the basis of response data, a confirmatory trial set out to show clinical benefit. However, the confirmatory phase 3 IMpassion131 trial did not do so: it found that atezolizumab plus paclitaxel did not significantly reduce the risk for cancer progression and death in comparison with paclitaxel plus placebo among patients with TNBC with tumors that were positive for programmed cell death protein–1 (PD-L1), as reported by Medscape Medical News.
These results were discussed by the Food and Drug Administration on the first day of a historic 3-day meeting on accelerated approvals in April 2021. Despite the failure of confirmation of clinical benefit, the advisory panel voted 7-2 in favor of keeping the approval in place for atezolizumab in TNBC. At the same time, it urged Genentech to carry out more studies to show that the drug works in this patient population.
The company apparently decided not to do that and instead voluntarily withdrew the application for the indication some 4 months later.
During the recent TNBC Foundation webinar, Genentech official Lauren Davis said that the company sent letters about this decision to atezolizumab-prescribing physicians and included another letter that was to be shared with patients. Ms. Davis had not responded to this news organization’s request to review the communications at the time this article was published.
At the webinar, Ms. Davis did clarify that current atezolizumab patients (who are responding to the drug), who have commercial insurance, and who benefit from Genentech’s copay program will continue to receive the benefit until June 2022.
In its August announcement, Genentech said it decided to withdraw the atezolizumab approval on the basis of the FDA’s assessment of the “current mTNBC treatment landscape and in accordance with the requirements of the accelerated approval program.”
That landscape presumably includes pembrolizumab (Keytruda), which received a full approval for a TNBC indication similar to that of atezolizumab in July. That full approval was based on findings from the randomized, phase 3 KEYNOTE-522 trial, which showed significantly prolonged event-free survival with the pembrolizumab regimen in comparison with neoadjuvant chemotherapy alone for previously untreated stage II or III TNBC. Details of these clinical data will be presented at the upcoming annual meeting of the European Society of Medical Oncology.
Switching the immunotherapy?
Some U.S. oncologists have been telling patients with mTNBC that the atezolizumab withdrawal is “not an issue” because the new full approval of pembrolizumab in this setting will allow prescriptions to be switched, said patient advocate Ms. Cowden.
However, experts have said that no patient who is responding to or whose condition is stable with atezolizumab should switch immunotherapies. “This is a very aggressive disease,” reminded Dr. Lustberg.
Switching the immunotherapies is complicated by the difference in the respective drugs’ companion biomarker assays used to establish the presence of PD-L1.
Dr. Lustberg explained that patients who are not responding to atezolizumab and who now want to try pembrolizumab will have to be assessed with the CTS assay.
“About 22% of the patients who are positive for the atezolizumab biomarker assay SP-142 are not going to be positive for the CTS,” she said.
In other words, about one in four patients with mTNBC who are taking atezolizumab will not qualify for treatment with pembrolizumab.
Rebecca Shatsky, MD, of the University of California, San Diego, echoed those comments in an email to this news organization – and emphatically discouraged switching off atezolizumab (and going on pembrolizumab) if a patient is having success (i.e., stable disease or positive response).
“The two groups don’t always overlap, so it isn’t an easy switch. That’s why if they are already responding, I would NOT have them stop the drug,” she said.
Not every mTNBC patient receiving – and responding to – atezolizumab has had the unfortunate experience of having their prescription canceled.
Johanna Rauhala, of San Francisco, who is a former middle-school teacher and who writes the blog Pink Stinks, has been taking atezolizumab for 2 years. She has had a partial response and now, after taking the immunotherapy in combination with chemotherapy (gemcitabine and carboplatin), has stable disease. Currently, she is taking single-agent atezolizumab..
Ms. Rauhala has been living with mTNBC for 5 years. She said in an interview that she was “very surprised and concerned” to learn about Genentech’s withdrawal of its accelerated approval. She said that at her next treatment appointment, she was “probably going to ask the oncology nurse first [about the atezolizumab withdrawal] – because they are the front line, and I will then follow-up with my doctor. But I can’t imagine that they will take away something that is working.”
Dr. Shatsky, Dr. Horton, and Dr. Lunsberg report no relevant financial disclosures.
A version of this article first appeared on Medscape.com.
The discontinuance appears to be in reaction to an announcement by the manufacturer (Genentech) in late August that it has voluntarily withdrawn its application for accelerated approval of the drug for use in metastatic triple-negative breast cancer (mTNBC).
However, experts stress that discontinuing atezolizumab is not advised if a patient is responding to or is stable on the immune checkpoint inhibitor.
“I think the Genentech announcement has been misinterpreted,” Maryam Lustberg, MD, of Yale Cancer Center, New Haven, Conn., said in an interview. “The consensus opinion from all academic breast oncologists is that people should not be switching off atezolizumab if they are responding. They should not be changing their immunotherapy.”
Dr. Lustberg said the announcement had two major points: “don’t start a new patient on atezolizumab,” and the company is “committed” to supplying the drug to patients whose conditions are stable or responding.
Nevertheless, some patients with mTNBC were recently in a state of escalating emotional upset, said one patient advocate.
“The level of panic among those currently on & responding well to Atezo is growing quickly,” tweeted Janice Cowden on Sept. 5, a former nurse living with mTNBC in Bradenton, Fla.
Ms. Cowden explained that “at least 10-20 patients” were “pulled [off the drug by their oncologists] this past week who have been stable/no evidence of disease/no evidence of disease activity on Tecentriq.”
She estimated that as many as 50 patients in the 2,200-member Triple Negative BC Stage 4 Facebook group who have been responding to the drug were abruptly de-prescribed atezolizumab since the Aug. 27 announcement from Genentech.
Many women learned of the change via patient portals or text messaging, not directly from their physicians, Cowden told Medscape Medical News.
Some of the women had been taking atezolizumab for 2-3 years, including those with no evidence of disease, she said. “Finding out that their oncologist was discontinuing a treatment that was working for them has been driving so much anxiety and stress,” Ms. Cowden emphasized.
Most market withdrawals of drugs are related to safety, but that is not the case with atezolizumab, said Sara Horton, MD, of Howard University, Washington. She was speaking at the recent Facebook webinar on atezolizumab and mTNBC that was sponsored by the TNBC Foundation and the Young Survivors Coalition.
In the case of atezolizumab, it was a question about efficacy that prompted the withdrawal. After the indication was granted an accelerated approval on the basis of response data, a confirmatory trial set out to show clinical benefit. However, the confirmatory phase 3 IMpassion131 trial did not do so: it found that atezolizumab plus paclitaxel did not significantly reduce the risk for cancer progression and death in comparison with paclitaxel plus placebo among patients with TNBC with tumors that were positive for programmed cell death protein–1 (PD-L1), as reported by Medscape Medical News.
These results were discussed by the Food and Drug Administration on the first day of a historic 3-day meeting on accelerated approvals in April 2021. Despite the failure of confirmation of clinical benefit, the advisory panel voted 7-2 in favor of keeping the approval in place for atezolizumab in TNBC. At the same time, it urged Genentech to carry out more studies to show that the drug works in this patient population.
The company apparently decided not to do that and instead voluntarily withdrew the application for the indication some 4 months later.
During the recent TNBC Foundation webinar, Genentech official Lauren Davis said that the company sent letters about this decision to atezolizumab-prescribing physicians and included another letter that was to be shared with patients. Ms. Davis had not responded to this news organization’s request to review the communications at the time this article was published.
At the webinar, Ms. Davis did clarify that current atezolizumab patients (who are responding to the drug), who have commercial insurance, and who benefit from Genentech’s copay program will continue to receive the benefit until June 2022.
In its August announcement, Genentech said it decided to withdraw the atezolizumab approval on the basis of the FDA’s assessment of the “current mTNBC treatment landscape and in accordance with the requirements of the accelerated approval program.”
That landscape presumably includes pembrolizumab (Keytruda), which received a full approval for a TNBC indication similar to that of atezolizumab in July. That full approval was based on findings from the randomized, phase 3 KEYNOTE-522 trial, which showed significantly prolonged event-free survival with the pembrolizumab regimen in comparison with neoadjuvant chemotherapy alone for previously untreated stage II or III TNBC. Details of these clinical data will be presented at the upcoming annual meeting of the European Society of Medical Oncology.
Switching the immunotherapy?
Some U.S. oncologists have been telling patients with mTNBC that the atezolizumab withdrawal is “not an issue” because the new full approval of pembrolizumab in this setting will allow prescriptions to be switched, said patient advocate Ms. Cowden.
However, experts have said that no patient who is responding to or whose condition is stable with atezolizumab should switch immunotherapies. “This is a very aggressive disease,” reminded Dr. Lustberg.
Switching the immunotherapies is complicated by the difference in the respective drugs’ companion biomarker assays used to establish the presence of PD-L1.
Dr. Lustberg explained that patients who are not responding to atezolizumab and who now want to try pembrolizumab will have to be assessed with the CTS assay.
“About 22% of the patients who are positive for the atezolizumab biomarker assay SP-142 are not going to be positive for the CTS,” she said.
In other words, about one in four patients with mTNBC who are taking atezolizumab will not qualify for treatment with pembrolizumab.
Rebecca Shatsky, MD, of the University of California, San Diego, echoed those comments in an email to this news organization – and emphatically discouraged switching off atezolizumab (and going on pembrolizumab) if a patient is having success (i.e., stable disease or positive response).
“The two groups don’t always overlap, so it isn’t an easy switch. That’s why if they are already responding, I would NOT have them stop the drug,” she said.
Not every mTNBC patient receiving – and responding to – atezolizumab has had the unfortunate experience of having their prescription canceled.
Johanna Rauhala, of San Francisco, who is a former middle-school teacher and who writes the blog Pink Stinks, has been taking atezolizumab for 2 years. She has had a partial response and now, after taking the immunotherapy in combination with chemotherapy (gemcitabine and carboplatin), has stable disease. Currently, she is taking single-agent atezolizumab..
Ms. Rauhala has been living with mTNBC for 5 years. She said in an interview that she was “very surprised and concerned” to learn about Genentech’s withdrawal of its accelerated approval. She said that at her next treatment appointment, she was “probably going to ask the oncology nurse first [about the atezolizumab withdrawal] – because they are the front line, and I will then follow-up with my doctor. But I can’t imagine that they will take away something that is working.”
Dr. Shatsky, Dr. Horton, and Dr. Lunsberg report no relevant financial disclosures.
A version of this article first appeared on Medscape.com.
The discontinuance appears to be in reaction to an announcement by the manufacturer (Genentech) in late August that it has voluntarily withdrawn its application for accelerated approval of the drug for use in metastatic triple-negative breast cancer (mTNBC).
However, experts stress that discontinuing atezolizumab is not advised if a patient is responding to or is stable on the immune checkpoint inhibitor.
“I think the Genentech announcement has been misinterpreted,” Maryam Lustberg, MD, of Yale Cancer Center, New Haven, Conn., said in an interview. “The consensus opinion from all academic breast oncologists is that people should not be switching off atezolizumab if they are responding. They should not be changing their immunotherapy.”
Dr. Lustberg said the announcement had two major points: “don’t start a new patient on atezolizumab,” and the company is “committed” to supplying the drug to patients whose conditions are stable or responding.
Nevertheless, some patients with mTNBC were recently in a state of escalating emotional upset, said one patient advocate.
“The level of panic among those currently on & responding well to Atezo is growing quickly,” tweeted Janice Cowden on Sept. 5, a former nurse living with mTNBC in Bradenton, Fla.
Ms. Cowden explained that “at least 10-20 patients” were “pulled [off the drug by their oncologists] this past week who have been stable/no evidence of disease/no evidence of disease activity on Tecentriq.”
She estimated that as many as 50 patients in the 2,200-member Triple Negative BC Stage 4 Facebook group who have been responding to the drug were abruptly de-prescribed atezolizumab since the Aug. 27 announcement from Genentech.
Many women learned of the change via patient portals or text messaging, not directly from their physicians, Cowden told Medscape Medical News.
Some of the women had been taking atezolizumab for 2-3 years, including those with no evidence of disease, she said. “Finding out that their oncologist was discontinuing a treatment that was working for them has been driving so much anxiety and stress,” Ms. Cowden emphasized.
Most market withdrawals of drugs are related to safety, but that is not the case with atezolizumab, said Sara Horton, MD, of Howard University, Washington. She was speaking at the recent Facebook webinar on atezolizumab and mTNBC that was sponsored by the TNBC Foundation and the Young Survivors Coalition.
In the case of atezolizumab, it was a question about efficacy that prompted the withdrawal. After the indication was granted an accelerated approval on the basis of response data, a confirmatory trial set out to show clinical benefit. However, the confirmatory phase 3 IMpassion131 trial did not do so: it found that atezolizumab plus paclitaxel did not significantly reduce the risk for cancer progression and death in comparison with paclitaxel plus placebo among patients with TNBC with tumors that were positive for programmed cell death protein–1 (PD-L1), as reported by Medscape Medical News.
These results were discussed by the Food and Drug Administration on the first day of a historic 3-day meeting on accelerated approvals in April 2021. Despite the failure of confirmation of clinical benefit, the advisory panel voted 7-2 in favor of keeping the approval in place for atezolizumab in TNBC. At the same time, it urged Genentech to carry out more studies to show that the drug works in this patient population.
The company apparently decided not to do that and instead voluntarily withdrew the application for the indication some 4 months later.
During the recent TNBC Foundation webinar, Genentech official Lauren Davis said that the company sent letters about this decision to atezolizumab-prescribing physicians and included another letter that was to be shared with patients. Ms. Davis had not responded to this news organization’s request to review the communications at the time this article was published.
At the webinar, Ms. Davis did clarify that current atezolizumab patients (who are responding to the drug), who have commercial insurance, and who benefit from Genentech’s copay program will continue to receive the benefit until June 2022.
In its August announcement, Genentech said it decided to withdraw the atezolizumab approval on the basis of the FDA’s assessment of the “current mTNBC treatment landscape and in accordance with the requirements of the accelerated approval program.”
That landscape presumably includes pembrolizumab (Keytruda), which received a full approval for a TNBC indication similar to that of atezolizumab in July. That full approval was based on findings from the randomized, phase 3 KEYNOTE-522 trial, which showed significantly prolonged event-free survival with the pembrolizumab regimen in comparison with neoadjuvant chemotherapy alone for previously untreated stage II or III TNBC. Details of these clinical data will be presented at the upcoming annual meeting of the European Society of Medical Oncology.
Switching the immunotherapy?
Some U.S. oncologists have been telling patients with mTNBC that the atezolizumab withdrawal is “not an issue” because the new full approval of pembrolizumab in this setting will allow prescriptions to be switched, said patient advocate Ms. Cowden.
However, experts have said that no patient who is responding to or whose condition is stable with atezolizumab should switch immunotherapies. “This is a very aggressive disease,” reminded Dr. Lustberg.
Switching the immunotherapies is complicated by the difference in the respective drugs’ companion biomarker assays used to establish the presence of PD-L1.
Dr. Lustberg explained that patients who are not responding to atezolizumab and who now want to try pembrolizumab will have to be assessed with the CTS assay.
“About 22% of the patients who are positive for the atezolizumab biomarker assay SP-142 are not going to be positive for the CTS,” she said.
In other words, about one in four patients with mTNBC who are taking atezolizumab will not qualify for treatment with pembrolizumab.
Rebecca Shatsky, MD, of the University of California, San Diego, echoed those comments in an email to this news organization – and emphatically discouraged switching off atezolizumab (and going on pembrolizumab) if a patient is having success (i.e., stable disease or positive response).
“The two groups don’t always overlap, so it isn’t an easy switch. That’s why if they are already responding, I would NOT have them stop the drug,” she said.
Not every mTNBC patient receiving – and responding to – atezolizumab has had the unfortunate experience of having their prescription canceled.
Johanna Rauhala, of San Francisco, who is a former middle-school teacher and who writes the blog Pink Stinks, has been taking atezolizumab for 2 years. She has had a partial response and now, after taking the immunotherapy in combination with chemotherapy (gemcitabine and carboplatin), has stable disease. Currently, she is taking single-agent atezolizumab..
Ms. Rauhala has been living with mTNBC for 5 years. She said in an interview that she was “very surprised and concerned” to learn about Genentech’s withdrawal of its accelerated approval. She said that at her next treatment appointment, she was “probably going to ask the oncology nurse first [about the atezolizumab withdrawal] – because they are the front line, and I will then follow-up with my doctor. But I can’t imagine that they will take away something that is working.”
Dr. Shatsky, Dr. Horton, and Dr. Lunsberg report no relevant financial disclosures.
A version of this article first appeared on Medscape.com.