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Genes related to osteosarcoma survival identified
When they combined them into a risk score and added one additional factor – metastases at diagnosis – the model was an “excellent” predictor of 1-year survival, the team said (area under the curve, 0.947; 95% confidence interval, 0.832-0.972).
“The survival-associated” immune-related genes (IRGs) “examined in this study have potential for identifying prognosis in osteosarcoma and may be clinically useful as relevant clinical biomarkers and candidate targets for anticancer therapy,” said investigators led by Wangmi Liu, MD, of Zhejiang University in Hangzhou, China. The study was published in JAMA Network Open.
They explained that it’s often difficult to distinguish high- and low-risk patients at osteosarcoma diagnosis. To address the issue, they analyzed the genomic signatures of 84 patients in the Cancer Genome Atlas and their associated clinical information.
The team split their subjects evenly into high-risk and low-risk groups based on a score developed from their genetic signatures. A total of 26 patients in the high-risk group (61.9%) died over a median follow up of 4.1 years versus only 1 (2.4%) in the low-risk group.
The risk score also correlated positively with B-cell tumor infiltration, and negatively with infiltration of CD8 T cells and macrophages.
Overall, 16 genes were significantly up-regulated, and 187 genes were significantly down-regulated in the high-risk group, including three survival-associated IRGs: CCL2, CD79A, and FPR1.
The differentially expressed genes were most significantly associated with transmembrane signaling receptor activity and inflammatory response. The team noted that “it has been reported that inflammatory response plays a critical role in tumor initiation, promotion, malignant conversion, invasion, and metastases.”
Of the 14 survival-associated IRGs, 5 have been reported before in osteosarcoma. The other nine were deduced from computational analysis and may be potential treatment targets, including bone morphogenetic protein 8b (BMP8b). Another member of the BMP family, BMP9, has been shown to promote the proliferation of osteosarcoma cells, “which is similar to this study’s finding that BMP8b was a risk factor in osteosarcoma. Therefore, the role of BMP8b in osteosarcoma needs further research,” the team said.
“Because the database provides limited clinical information, other important factors, such as staging and grading, were not included in our analysis. Therefore, extrapolation based on the findings must be done very carefully,” they cautioned.
The work was supported by the National Natural Science Foundation of China and others. The investigators didn’t have any disclosures.
When they combined them into a risk score and added one additional factor – metastases at diagnosis – the model was an “excellent” predictor of 1-year survival, the team said (area under the curve, 0.947; 95% confidence interval, 0.832-0.972).
“The survival-associated” immune-related genes (IRGs) “examined in this study have potential for identifying prognosis in osteosarcoma and may be clinically useful as relevant clinical biomarkers and candidate targets for anticancer therapy,” said investigators led by Wangmi Liu, MD, of Zhejiang University in Hangzhou, China. The study was published in JAMA Network Open.
They explained that it’s often difficult to distinguish high- and low-risk patients at osteosarcoma diagnosis. To address the issue, they analyzed the genomic signatures of 84 patients in the Cancer Genome Atlas and their associated clinical information.
The team split their subjects evenly into high-risk and low-risk groups based on a score developed from their genetic signatures. A total of 26 patients in the high-risk group (61.9%) died over a median follow up of 4.1 years versus only 1 (2.4%) in the low-risk group.
The risk score also correlated positively with B-cell tumor infiltration, and negatively with infiltration of CD8 T cells and macrophages.
Overall, 16 genes were significantly up-regulated, and 187 genes were significantly down-regulated in the high-risk group, including three survival-associated IRGs: CCL2, CD79A, and FPR1.
The differentially expressed genes were most significantly associated with transmembrane signaling receptor activity and inflammatory response. The team noted that “it has been reported that inflammatory response plays a critical role in tumor initiation, promotion, malignant conversion, invasion, and metastases.”
Of the 14 survival-associated IRGs, 5 have been reported before in osteosarcoma. The other nine were deduced from computational analysis and may be potential treatment targets, including bone morphogenetic protein 8b (BMP8b). Another member of the BMP family, BMP9, has been shown to promote the proliferation of osteosarcoma cells, “which is similar to this study’s finding that BMP8b was a risk factor in osteosarcoma. Therefore, the role of BMP8b in osteosarcoma needs further research,” the team said.
“Because the database provides limited clinical information, other important factors, such as staging and grading, were not included in our analysis. Therefore, extrapolation based on the findings must be done very carefully,” they cautioned.
The work was supported by the National Natural Science Foundation of China and others. The investigators didn’t have any disclosures.
When they combined them into a risk score and added one additional factor – metastases at diagnosis – the model was an “excellent” predictor of 1-year survival, the team said (area under the curve, 0.947; 95% confidence interval, 0.832-0.972).
“The survival-associated” immune-related genes (IRGs) “examined in this study have potential for identifying prognosis in osteosarcoma and may be clinically useful as relevant clinical biomarkers and candidate targets for anticancer therapy,” said investigators led by Wangmi Liu, MD, of Zhejiang University in Hangzhou, China. The study was published in JAMA Network Open.
They explained that it’s often difficult to distinguish high- and low-risk patients at osteosarcoma diagnosis. To address the issue, they analyzed the genomic signatures of 84 patients in the Cancer Genome Atlas and their associated clinical information.
The team split their subjects evenly into high-risk and low-risk groups based on a score developed from their genetic signatures. A total of 26 patients in the high-risk group (61.9%) died over a median follow up of 4.1 years versus only 1 (2.4%) in the low-risk group.
The risk score also correlated positively with B-cell tumor infiltration, and negatively with infiltration of CD8 T cells and macrophages.
Overall, 16 genes were significantly up-regulated, and 187 genes were significantly down-regulated in the high-risk group, including three survival-associated IRGs: CCL2, CD79A, and FPR1.
The differentially expressed genes were most significantly associated with transmembrane signaling receptor activity and inflammatory response. The team noted that “it has been reported that inflammatory response plays a critical role in tumor initiation, promotion, malignant conversion, invasion, and metastases.”
Of the 14 survival-associated IRGs, 5 have been reported before in osteosarcoma. The other nine were deduced from computational analysis and may be potential treatment targets, including bone morphogenetic protein 8b (BMP8b). Another member of the BMP family, BMP9, has been shown to promote the proliferation of osteosarcoma cells, “which is similar to this study’s finding that BMP8b was a risk factor in osteosarcoma. Therefore, the role of BMP8b in osteosarcoma needs further research,” the team said.
“Because the database provides limited clinical information, other important factors, such as staging and grading, were not included in our analysis. Therefore, extrapolation based on the findings must be done very carefully,” they cautioned.
The work was supported by the National Natural Science Foundation of China and others. The investigators didn’t have any disclosures.
FROM JAMA NETWORK OPEN
Rare hematologic malignancy may first present to a dermatologist
in about 80% of cases.
“You won’t see blastic plasmacytoid dendritic cell neoplasm listed on our primary cutaneous lymphoma classifications because it’s not technically a primary cutaneous disease,” Brittney K. DeClerck, MD, said during the annual meeting of the Pacific Dermatologic Association. “It’s a systemic disease that has secondary cutaneous manifestations. That’s a very important distinction to make, in terms of not missing the underlying disease associated with what might be commonly first seen on the skin.”
BPDCN is a malignancy of plasmacytoid dendritic cells, which capture, process, and present antigen, and allow the remainder of the immune system to be activated. “They are mainly derived from the myeloid cell lineage, and possibly from the lymphoid line in a subset of cases,” said Dr. DeClerck, associate professor of clinical pathology and dermatology at the University of Southern California, Los Angeles. “They secrete high levels of type I interferons, which is important for antiviral immunity, but they can also be implicated in severe systemic inflammatory diseases, such as systemic lupus erythematosus and systemic sclerosis.”
BPDCN involves the skin in about 80% of cases, she added, “but invariably at some point it involves the bone marrow and has an acute leukemic presentation, whether or not it happens concurrently with what we see on the skin as dermatologists. We also see variable involvement of the peripheral blood, lymph nodes, and the central nervous system.”
The classification of BPDCN has changed over time based on evolving immunohistochemical markers and technologies. For example, in 1995 it was called agranular CD4+ NK cell leukemia, in 2001 it was called blastic NK-cell lymphoma, in 2005 it was called CD4+/CD56+ hematodermic neoplasm, and in 2008 it was called BPDCN (AML subset). In 2016 it became classified as its own entity: BPDCN.
Because of changing nomenclature, the true incidence of the disease is unknown, but according to the best available literature, 75% of cases occur in men and the median age is between 60 and 70 years, “but all ages can be affected,” Dr. DeClerck said. “Cases seem to come in clusters. Our most recent cluster has been in our pediatric population. At Children’s Hospital Los Angeles, we’ve had three cases in the last couple of years. To me, that was a bit unusual.”
She added that 10%-20% of patients will have either a history of, or will develop another, hematologic malignancy, such as myelodysplastic syndrome (MDS), chronic myelogenous leukemia (CML), or acute myelogenous leukemia (AML).
The general prognosis of BPDCN is poor, and the mean time from onset of lesions to an actual diagnosis is about 6.2 months, which underscores the importance of early diagnosis, Dr. DeClerck said. “There can be some nondescript solitary lesions that patients can present with, so don’t hesitate to biopsy.” The median overall survival is less than 20 months, but patients under 60 years of age have a slightly better prognosis.
Clinical presentation
Clinically, the malignancy presents with variable involvement of the skin, bone marrow, lymph nodes, peripheral blood, and central nervous system. “Patients may have one or all of these,” she said. Because 80% of patients have skin lesions, “dermatologists should be aware of this entity in order to communicate with our pathologists to understand that maybe one biopsy isn’t enough. Several biopsies may be required.”
The most common dermatologic presentation of BPDCN is erythematous to deeply violaceous nodules. Other patients may present with infiltrated ecchymotic plaques or petechial to hyperpigmented macules, patches, and plaques. Biopsy reveals a diffusely infiltrated dermis of markedly atypical large cells, but occasionally can be more subtle. “Early lesions may only be perivascular in nature, so going on high power on anything that looks atypical on low power is important in these cases,” Dr. DeClerck said.
The recommended histochemical stains for suspected BPDCN include CD123, CD4, and CD56. “We need to have other stains to rule out other things, such as negative stains that are going to exclude other T cell and B cell processes, and Merkel cell carcinoma, which can express CD56. We also want to have another confirmatory stain because other things can express CD123, CD4, and CD56. Commonly we use TCL1 or TCF4.”
The differential diagnosis of cutaneous findings includes leukemia cutis, mycosis fungoides, NK/T-cell lymphoma, and cutaneous gamma-delta T-cell lymphoma, while the differential diagnosis of biopsy findings includes AML, acute lymphoblastic leukemia, and NK/T-cell lymphoma.
Treatment of BPDCN
Historically, BPDCN was treated with multiagent high-dose chemotherapy. “Patients would frequently respond early but would relapse quickly, progress, and have a poor outcome,” Dr. DeClerck said. Now, first-line therapy is tagraxofusp-erzs (Elzonris) or multiagent chemotherapy based on where the patient is in the course of disease. Tagraxofusp-erzs is an IL-3 conjugated diphtheria toxic fusion protein which binds to CD123, which was approved by the Food and Drug Administration in 2018 for treating BPDCN. After that initial therapy, it is determined whether the patient has a complete response or failed response, she said. “If they have a complete response, they frequently go on to bone marrow transplantation, which is the only curative therapy at this point for these patients.”
According to Dr. DeClerck, an anti-BCL-2 therapy, venetoclax, can be used for patients with BPDCN as well. National Comprehensive Cancer Network (NCCN) guidelines for the treatment of BPDCN can be found on the NCCN website.
Dr. DeClerck emphasized the importance of reviewing biopsy results with a hematopathologist, “because there are complex leukemias that are beyond what dermatopathologists have been trained in.” Once a patient is diagnosed with BPDCN, she recommends rapid referral to a large center for treatment and possible bone marrow transplantation.
Dr. DeClerck disclosed that she is an adviser for tagraxofusp-erzs manufacturer Stemline Therapeutics.
in about 80% of cases.
“You won’t see blastic plasmacytoid dendritic cell neoplasm listed on our primary cutaneous lymphoma classifications because it’s not technically a primary cutaneous disease,” Brittney K. DeClerck, MD, said during the annual meeting of the Pacific Dermatologic Association. “It’s a systemic disease that has secondary cutaneous manifestations. That’s a very important distinction to make, in terms of not missing the underlying disease associated with what might be commonly first seen on the skin.”
BPDCN is a malignancy of plasmacytoid dendritic cells, which capture, process, and present antigen, and allow the remainder of the immune system to be activated. “They are mainly derived from the myeloid cell lineage, and possibly from the lymphoid line in a subset of cases,” said Dr. DeClerck, associate professor of clinical pathology and dermatology at the University of Southern California, Los Angeles. “They secrete high levels of type I interferons, which is important for antiviral immunity, but they can also be implicated in severe systemic inflammatory diseases, such as systemic lupus erythematosus and systemic sclerosis.”
BPDCN involves the skin in about 80% of cases, she added, “but invariably at some point it involves the bone marrow and has an acute leukemic presentation, whether or not it happens concurrently with what we see on the skin as dermatologists. We also see variable involvement of the peripheral blood, lymph nodes, and the central nervous system.”
The classification of BPDCN has changed over time based on evolving immunohistochemical markers and technologies. For example, in 1995 it was called agranular CD4+ NK cell leukemia, in 2001 it was called blastic NK-cell lymphoma, in 2005 it was called CD4+/CD56+ hematodermic neoplasm, and in 2008 it was called BPDCN (AML subset). In 2016 it became classified as its own entity: BPDCN.
Because of changing nomenclature, the true incidence of the disease is unknown, but according to the best available literature, 75% of cases occur in men and the median age is between 60 and 70 years, “but all ages can be affected,” Dr. DeClerck said. “Cases seem to come in clusters. Our most recent cluster has been in our pediatric population. At Children’s Hospital Los Angeles, we’ve had three cases in the last couple of years. To me, that was a bit unusual.”
She added that 10%-20% of patients will have either a history of, or will develop another, hematologic malignancy, such as myelodysplastic syndrome (MDS), chronic myelogenous leukemia (CML), or acute myelogenous leukemia (AML).
The general prognosis of BPDCN is poor, and the mean time from onset of lesions to an actual diagnosis is about 6.2 months, which underscores the importance of early diagnosis, Dr. DeClerck said. “There can be some nondescript solitary lesions that patients can present with, so don’t hesitate to biopsy.” The median overall survival is less than 20 months, but patients under 60 years of age have a slightly better prognosis.
Clinical presentation
Clinically, the malignancy presents with variable involvement of the skin, bone marrow, lymph nodes, peripheral blood, and central nervous system. “Patients may have one or all of these,” she said. Because 80% of patients have skin lesions, “dermatologists should be aware of this entity in order to communicate with our pathologists to understand that maybe one biopsy isn’t enough. Several biopsies may be required.”
The most common dermatologic presentation of BPDCN is erythematous to deeply violaceous nodules. Other patients may present with infiltrated ecchymotic plaques or petechial to hyperpigmented macules, patches, and plaques. Biopsy reveals a diffusely infiltrated dermis of markedly atypical large cells, but occasionally can be more subtle. “Early lesions may only be perivascular in nature, so going on high power on anything that looks atypical on low power is important in these cases,” Dr. DeClerck said.
The recommended histochemical stains for suspected BPDCN include CD123, CD4, and CD56. “We need to have other stains to rule out other things, such as negative stains that are going to exclude other T cell and B cell processes, and Merkel cell carcinoma, which can express CD56. We also want to have another confirmatory stain because other things can express CD123, CD4, and CD56. Commonly we use TCL1 or TCF4.”
The differential diagnosis of cutaneous findings includes leukemia cutis, mycosis fungoides, NK/T-cell lymphoma, and cutaneous gamma-delta T-cell lymphoma, while the differential diagnosis of biopsy findings includes AML, acute lymphoblastic leukemia, and NK/T-cell lymphoma.
Treatment of BPDCN
Historically, BPDCN was treated with multiagent high-dose chemotherapy. “Patients would frequently respond early but would relapse quickly, progress, and have a poor outcome,” Dr. DeClerck said. Now, first-line therapy is tagraxofusp-erzs (Elzonris) or multiagent chemotherapy based on where the patient is in the course of disease. Tagraxofusp-erzs is an IL-3 conjugated diphtheria toxic fusion protein which binds to CD123, which was approved by the Food and Drug Administration in 2018 for treating BPDCN. After that initial therapy, it is determined whether the patient has a complete response or failed response, she said. “If they have a complete response, they frequently go on to bone marrow transplantation, which is the only curative therapy at this point for these patients.”
According to Dr. DeClerck, an anti-BCL-2 therapy, venetoclax, can be used for patients with BPDCN as well. National Comprehensive Cancer Network (NCCN) guidelines for the treatment of BPDCN can be found on the NCCN website.
Dr. DeClerck emphasized the importance of reviewing biopsy results with a hematopathologist, “because there are complex leukemias that are beyond what dermatopathologists have been trained in.” Once a patient is diagnosed with BPDCN, she recommends rapid referral to a large center for treatment and possible bone marrow transplantation.
Dr. DeClerck disclosed that she is an adviser for tagraxofusp-erzs manufacturer Stemline Therapeutics.
in about 80% of cases.
“You won’t see blastic plasmacytoid dendritic cell neoplasm listed on our primary cutaneous lymphoma classifications because it’s not technically a primary cutaneous disease,” Brittney K. DeClerck, MD, said during the annual meeting of the Pacific Dermatologic Association. “It’s a systemic disease that has secondary cutaneous manifestations. That’s a very important distinction to make, in terms of not missing the underlying disease associated with what might be commonly first seen on the skin.”
BPDCN is a malignancy of plasmacytoid dendritic cells, which capture, process, and present antigen, and allow the remainder of the immune system to be activated. “They are mainly derived from the myeloid cell lineage, and possibly from the lymphoid line in a subset of cases,” said Dr. DeClerck, associate professor of clinical pathology and dermatology at the University of Southern California, Los Angeles. “They secrete high levels of type I interferons, which is important for antiviral immunity, but they can also be implicated in severe systemic inflammatory diseases, such as systemic lupus erythematosus and systemic sclerosis.”
BPDCN involves the skin in about 80% of cases, she added, “but invariably at some point it involves the bone marrow and has an acute leukemic presentation, whether or not it happens concurrently with what we see on the skin as dermatologists. We also see variable involvement of the peripheral blood, lymph nodes, and the central nervous system.”
The classification of BPDCN has changed over time based on evolving immunohistochemical markers and technologies. For example, in 1995 it was called agranular CD4+ NK cell leukemia, in 2001 it was called blastic NK-cell lymphoma, in 2005 it was called CD4+/CD56+ hematodermic neoplasm, and in 2008 it was called BPDCN (AML subset). In 2016 it became classified as its own entity: BPDCN.
Because of changing nomenclature, the true incidence of the disease is unknown, but according to the best available literature, 75% of cases occur in men and the median age is between 60 and 70 years, “but all ages can be affected,” Dr. DeClerck said. “Cases seem to come in clusters. Our most recent cluster has been in our pediatric population. At Children’s Hospital Los Angeles, we’ve had three cases in the last couple of years. To me, that was a bit unusual.”
She added that 10%-20% of patients will have either a history of, or will develop another, hematologic malignancy, such as myelodysplastic syndrome (MDS), chronic myelogenous leukemia (CML), or acute myelogenous leukemia (AML).
The general prognosis of BPDCN is poor, and the mean time from onset of lesions to an actual diagnosis is about 6.2 months, which underscores the importance of early diagnosis, Dr. DeClerck said. “There can be some nondescript solitary lesions that patients can present with, so don’t hesitate to biopsy.” The median overall survival is less than 20 months, but patients under 60 years of age have a slightly better prognosis.
Clinical presentation
Clinically, the malignancy presents with variable involvement of the skin, bone marrow, lymph nodes, peripheral blood, and central nervous system. “Patients may have one or all of these,” she said. Because 80% of patients have skin lesions, “dermatologists should be aware of this entity in order to communicate with our pathologists to understand that maybe one biopsy isn’t enough. Several biopsies may be required.”
The most common dermatologic presentation of BPDCN is erythematous to deeply violaceous nodules. Other patients may present with infiltrated ecchymotic plaques or petechial to hyperpigmented macules, patches, and plaques. Biopsy reveals a diffusely infiltrated dermis of markedly atypical large cells, but occasionally can be more subtle. “Early lesions may only be perivascular in nature, so going on high power on anything that looks atypical on low power is important in these cases,” Dr. DeClerck said.
The recommended histochemical stains for suspected BPDCN include CD123, CD4, and CD56. “We need to have other stains to rule out other things, such as negative stains that are going to exclude other T cell and B cell processes, and Merkel cell carcinoma, which can express CD56. We also want to have another confirmatory stain because other things can express CD123, CD4, and CD56. Commonly we use TCL1 or TCF4.”
The differential diagnosis of cutaneous findings includes leukemia cutis, mycosis fungoides, NK/T-cell lymphoma, and cutaneous gamma-delta T-cell lymphoma, while the differential diagnosis of biopsy findings includes AML, acute lymphoblastic leukemia, and NK/T-cell lymphoma.
Treatment of BPDCN
Historically, BPDCN was treated with multiagent high-dose chemotherapy. “Patients would frequently respond early but would relapse quickly, progress, and have a poor outcome,” Dr. DeClerck said. Now, first-line therapy is tagraxofusp-erzs (Elzonris) or multiagent chemotherapy based on where the patient is in the course of disease. Tagraxofusp-erzs is an IL-3 conjugated diphtheria toxic fusion protein which binds to CD123, which was approved by the Food and Drug Administration in 2018 for treating BPDCN. After that initial therapy, it is determined whether the patient has a complete response or failed response, she said. “If they have a complete response, they frequently go on to bone marrow transplantation, which is the only curative therapy at this point for these patients.”
According to Dr. DeClerck, an anti-BCL-2 therapy, venetoclax, can be used for patients with BPDCN as well. National Comprehensive Cancer Network (NCCN) guidelines for the treatment of BPDCN can be found on the NCCN website.
Dr. DeClerck emphasized the importance of reviewing biopsy results with a hematopathologist, “because there are complex leukemias that are beyond what dermatopathologists have been trained in.” Once a patient is diagnosed with BPDCN, she recommends rapid referral to a large center for treatment and possible bone marrow transplantation.
Dr. DeClerck disclosed that she is an adviser for tagraxofusp-erzs manufacturer Stemline Therapeutics.
FROM PDA 2021
Synthetic triglyceride shows potential in Huntington’s disease
, according to data presented at the International Congress of Parkinson’s Disease and Movement Disorders.
Reporting results of TRIHEP3 and an extension study, Fanny Mochel, MD, PhD, of Sorbonne University in Paris and the Paris Brain Institute, said in an interview that her group is the only one investigating triheptanoin to target caudate atrophy in Huntington’s disease. The Food and Drug Administration last year approved triheptanoin for the treatment of long-chain fatty acid oxidation disorders.
“The main findings are two observations: that patients were clinically stable based on their gradation of total motor score (TMS) on UHDRS (Unified Huntington’s Disease Rating Scale) after 1 year,” Dr. Mochel said in an interview. “The other is that we observed a reduction of the caudate atrophy progression that we usually see over 1 year by about 50%.”
TRIHEP3 randomized 100 patients with early-stage Huntington’s disease to triheptanoin 1g/kg daily and placebo. It followed on previous research in which the group used 31-phosphorus brain MR spectroscopy to demonstrate triheptanoin restored a normal brain energetic profile in patients with Huntington’s disease. TRIHEP3 was a 6-month randomized controlled trial at two centers, followed by a 6-month open-label phase. After that, 42 patients opted to participate in the 1-year extension study.
TRIHEP3 found no difference in caudate boundary shift integral (cBSI) at 6 months – the primary endpoint. But in the extension study, TMS tended to stabilize in patients treated for 1 year (0.6 ± 5.1), compared with those treated for 6 months (2.5 ± 4.5, P = .072).
Using a placebo control group from an external study of patients with Huntington’s disease with what Dr. Mochel described as “identical clinical characteristics,” she said the research confirmed TMS clinical stability in treated patients at 1 year (2.6 ± 4.6 vs. 0.6 ± 5.1, P = .057) and found significantly lower caudate atrophy (–3% vs. –6.7%, compared with baseline, P < .001).
Dr. Mochel also noted that Diffusion Tensor Imaging and Fixed-based analyses (FBA) showed fewer alterations in fiber metrics at 24 months in patients treated from baseline. FBA also showed improved fiber trophicity at 24 months in both groups.
‘The first good news’
Dr. Mochel noted that the Huntington’s disease community had been shaken in the spring by the failure of three trials of gene-targeting therapies for Huntington’s disease. Roche halted a phase 3 study of its antisense oligonucleotide (ASO) tominersen, and Wave Life Sciences scuttled two ASO programs in phase 1/2 trials.
“Triheptanoin is not going to cure Huntington’s disease; it’s a disease with many components, but it does work on the energy aspects and that seems to stabilize patients over the time of observation,” Dr. Mochel said. “That’s the first good news.”
She also noted that side effects were mainly gastrointestinal in nature, and they typically resolved with dietary management.
As a target in Huntington disease, the caudate nucleus is highly desirable, and caudate atrophy has been shown to occur even before the onset of motor symptoms, said N. Ahmad Aziz, MD, PhD, a neurologist and epidemiologist at the German Center for Neurodegenerative Diseases at the University of Bonn (Germany). “In this light, the findings of the trial conducted by Dr. Mochel and colleagues, which suggest that triheptanoin intake may slow down the rate of caudate atrophy in patients with early-stage Huntington’s disease, are highly promising,” Dr. Aziz said in an interview.
However, he noted that the improvement in caudate atrophy was only a secondary endpoint in the extension study. “Nevertheless, given triheptanoin’s biologically plausible mechanism of action – i.e., provision of substrates to the Krebs cycle and at least partial restoration of the well-documented defective mitochondrial function in Huntington’s disease – combined with its apparently relatively mild side-effect profile and good tolerability, I think that the preliminary findings of this trial are very promising and justify a larger phase 3 trial,” Dr. Aziz said.
Dr. Mochel said that the findings are prompting the investigators to consider just that.
Dr. Mochel has received consulting fees from and conducted investigator‐sponsored studies supported by Ultragenyx Pharmaceuticals. Dr. Aziz has no relevant financial relationships to disclose.
, according to data presented at the International Congress of Parkinson’s Disease and Movement Disorders.
Reporting results of TRIHEP3 and an extension study, Fanny Mochel, MD, PhD, of Sorbonne University in Paris and the Paris Brain Institute, said in an interview that her group is the only one investigating triheptanoin to target caudate atrophy in Huntington’s disease. The Food and Drug Administration last year approved triheptanoin for the treatment of long-chain fatty acid oxidation disorders.
“The main findings are two observations: that patients were clinically stable based on their gradation of total motor score (TMS) on UHDRS (Unified Huntington’s Disease Rating Scale) after 1 year,” Dr. Mochel said in an interview. “The other is that we observed a reduction of the caudate atrophy progression that we usually see over 1 year by about 50%.”
TRIHEP3 randomized 100 patients with early-stage Huntington’s disease to triheptanoin 1g/kg daily and placebo. It followed on previous research in which the group used 31-phosphorus brain MR spectroscopy to demonstrate triheptanoin restored a normal brain energetic profile in patients with Huntington’s disease. TRIHEP3 was a 6-month randomized controlled trial at two centers, followed by a 6-month open-label phase. After that, 42 patients opted to participate in the 1-year extension study.
TRIHEP3 found no difference in caudate boundary shift integral (cBSI) at 6 months – the primary endpoint. But in the extension study, TMS tended to stabilize in patients treated for 1 year (0.6 ± 5.1), compared with those treated for 6 months (2.5 ± 4.5, P = .072).
Using a placebo control group from an external study of patients with Huntington’s disease with what Dr. Mochel described as “identical clinical characteristics,” she said the research confirmed TMS clinical stability in treated patients at 1 year (2.6 ± 4.6 vs. 0.6 ± 5.1, P = .057) and found significantly lower caudate atrophy (–3% vs. –6.7%, compared with baseline, P < .001).
Dr. Mochel also noted that Diffusion Tensor Imaging and Fixed-based analyses (FBA) showed fewer alterations in fiber metrics at 24 months in patients treated from baseline. FBA also showed improved fiber trophicity at 24 months in both groups.
‘The first good news’
Dr. Mochel noted that the Huntington’s disease community had been shaken in the spring by the failure of three trials of gene-targeting therapies for Huntington’s disease. Roche halted a phase 3 study of its antisense oligonucleotide (ASO) tominersen, and Wave Life Sciences scuttled two ASO programs in phase 1/2 trials.
“Triheptanoin is not going to cure Huntington’s disease; it’s a disease with many components, but it does work on the energy aspects and that seems to stabilize patients over the time of observation,” Dr. Mochel said. “That’s the first good news.”
She also noted that side effects were mainly gastrointestinal in nature, and they typically resolved with dietary management.
As a target in Huntington disease, the caudate nucleus is highly desirable, and caudate atrophy has been shown to occur even before the onset of motor symptoms, said N. Ahmad Aziz, MD, PhD, a neurologist and epidemiologist at the German Center for Neurodegenerative Diseases at the University of Bonn (Germany). “In this light, the findings of the trial conducted by Dr. Mochel and colleagues, which suggest that triheptanoin intake may slow down the rate of caudate atrophy in patients with early-stage Huntington’s disease, are highly promising,” Dr. Aziz said in an interview.
However, he noted that the improvement in caudate atrophy was only a secondary endpoint in the extension study. “Nevertheless, given triheptanoin’s biologically plausible mechanism of action – i.e., provision of substrates to the Krebs cycle and at least partial restoration of the well-documented defective mitochondrial function in Huntington’s disease – combined with its apparently relatively mild side-effect profile and good tolerability, I think that the preliminary findings of this trial are very promising and justify a larger phase 3 trial,” Dr. Aziz said.
Dr. Mochel said that the findings are prompting the investigators to consider just that.
Dr. Mochel has received consulting fees from and conducted investigator‐sponsored studies supported by Ultragenyx Pharmaceuticals. Dr. Aziz has no relevant financial relationships to disclose.
, according to data presented at the International Congress of Parkinson’s Disease and Movement Disorders.
Reporting results of TRIHEP3 and an extension study, Fanny Mochel, MD, PhD, of Sorbonne University in Paris and the Paris Brain Institute, said in an interview that her group is the only one investigating triheptanoin to target caudate atrophy in Huntington’s disease. The Food and Drug Administration last year approved triheptanoin for the treatment of long-chain fatty acid oxidation disorders.
“The main findings are two observations: that patients were clinically stable based on their gradation of total motor score (TMS) on UHDRS (Unified Huntington’s Disease Rating Scale) after 1 year,” Dr. Mochel said in an interview. “The other is that we observed a reduction of the caudate atrophy progression that we usually see over 1 year by about 50%.”
TRIHEP3 randomized 100 patients with early-stage Huntington’s disease to triheptanoin 1g/kg daily and placebo. It followed on previous research in which the group used 31-phosphorus brain MR spectroscopy to demonstrate triheptanoin restored a normal brain energetic profile in patients with Huntington’s disease. TRIHEP3 was a 6-month randomized controlled trial at two centers, followed by a 6-month open-label phase. After that, 42 patients opted to participate in the 1-year extension study.
TRIHEP3 found no difference in caudate boundary shift integral (cBSI) at 6 months – the primary endpoint. But in the extension study, TMS tended to stabilize in patients treated for 1 year (0.6 ± 5.1), compared with those treated for 6 months (2.5 ± 4.5, P = .072).
Using a placebo control group from an external study of patients with Huntington’s disease with what Dr. Mochel described as “identical clinical characteristics,” she said the research confirmed TMS clinical stability in treated patients at 1 year (2.6 ± 4.6 vs. 0.6 ± 5.1, P = .057) and found significantly lower caudate atrophy (–3% vs. –6.7%, compared with baseline, P < .001).
Dr. Mochel also noted that Diffusion Tensor Imaging and Fixed-based analyses (FBA) showed fewer alterations in fiber metrics at 24 months in patients treated from baseline. FBA also showed improved fiber trophicity at 24 months in both groups.
‘The first good news’
Dr. Mochel noted that the Huntington’s disease community had been shaken in the spring by the failure of three trials of gene-targeting therapies for Huntington’s disease. Roche halted a phase 3 study of its antisense oligonucleotide (ASO) tominersen, and Wave Life Sciences scuttled two ASO programs in phase 1/2 trials.
“Triheptanoin is not going to cure Huntington’s disease; it’s a disease with many components, but it does work on the energy aspects and that seems to stabilize patients over the time of observation,” Dr. Mochel said. “That’s the first good news.”
She also noted that side effects were mainly gastrointestinal in nature, and they typically resolved with dietary management.
As a target in Huntington disease, the caudate nucleus is highly desirable, and caudate atrophy has been shown to occur even before the onset of motor symptoms, said N. Ahmad Aziz, MD, PhD, a neurologist and epidemiologist at the German Center for Neurodegenerative Diseases at the University of Bonn (Germany). “In this light, the findings of the trial conducted by Dr. Mochel and colleagues, which suggest that triheptanoin intake may slow down the rate of caudate atrophy in patients with early-stage Huntington’s disease, are highly promising,” Dr. Aziz said in an interview.
However, he noted that the improvement in caudate atrophy was only a secondary endpoint in the extension study. “Nevertheless, given triheptanoin’s biologically plausible mechanism of action – i.e., provision of substrates to the Krebs cycle and at least partial restoration of the well-documented defective mitochondrial function in Huntington’s disease – combined with its apparently relatively mild side-effect profile and good tolerability, I think that the preliminary findings of this trial are very promising and justify a larger phase 3 trial,” Dr. Aziz said.
Dr. Mochel said that the findings are prompting the investigators to consider just that.
Dr. Mochel has received consulting fees from and conducted investigator‐sponsored studies supported by Ultragenyx Pharmaceuticals. Dr. Aziz has no relevant financial relationships to disclose.
FROM MDS VIRTUAL CONGRESS 2021
Overlapping Phenotypic Features of PTEN Hamartoma Tumor Syndrome and Birt-Hogg-Dubé Syndrome
To the Editor:
PTEN hamartoma tumor syndrome (PHTS) encompasses a spectrum of disorders that most commonly are caused by autosomal-dominant germline mutations in the phosphatase and tensin homolog, PTEN, tumor suppressor gene on chromosome 10q23. We describe a patient who presented with clinical features of PHTS and Birt-Hogg-Dubé syndrome (BHDS). Because the genetic mutations associated with both PHTS and BHDS result in altered mammalian target of rapamycin (mTOR) signaling, patients may have overlapping phenotypic features.
A 51-year-old man with a history of multiple carcinomas presented for evaluation of flesh-colored papules on the cheeks, nose, tongue, and hands, in addition to numerous skin tags on the neck, axillae, and lower abdomen bilaterally. His medical history was notable for several nasal and gastrointestinal tract polyps, chromophobe renal cell carcinoma, cutaneous lipomas, atypical carcinoid syndrome of the right lung, and a multinodular thyroid. His family history was notable for small cell lung cancer in his father, breast cancer and pancreatic cancer in his maternal aunt, esophageal cancer in his maternal grandfather, and celiac disease in his daughter.
Clinical examination revealed flesh-colored, dome-shaped papules measuring 1 to 2 mm in diameter on the nose and cheeks (Figure 1). He had hyperkeratotic papules on the dorsal fingers, consistent with acral keratoses. Additionally, multiple flesh-colored papules with a cobblestonelike appearance were noted on the oral mucosa (Figure 2). Other findings included pedunculated papules on the neck, axillae, and lower abdomen bilaterally, consistent with fibroepithelial polyps, as well as hyperpigmented velvety plaques on the axillae, characteristic of acanthosis nigricans (Figure 3). A shave biopsy of a papule on the right cheek revealed a proliferation of plump stellate fibroblasts, small blood vessels, and thick collagen bundles, characteristic of a fibrous papule (Figure 4).
Differential diagnoses for our patient included BHDS and Cowden syndrome (CS). Due to the combination of extensive family history of multiorgan cancers as well as the clinical findings, he was referred to a geneticist for further evaluation. Genetic analysis was positive for a heterozygous mutation variant of uncertain significance in the PTEN gene.
The PHTS disorders include CS, Bannayan-Riley-Ruvalcaba syndrome, Lhermitte-Duclos disease, Proteus syndrome, and Proteus-like syndrome (Table).1-9 Our patient’s clinical findings were indicative of CS, a rare genodermatosis characterized by multiple hamartomas and neoplasms of ectodermal, mesodermal, and endodermal origin.1 Most CS patients develop trichilemmomas of the central face, mucocutaneous papillomatous papules, and acral and plantar keratoses by the third decade of life.1 Importantly, CS patients have an increased risk for breast, thyroid, renal, endometrial, and colorectal cancers, as well as melanoma, with estimated lifetime risks of 85%, 35%, 33%, 28%, 9%, and 6%, respectively.2,10
Regarding the pathophysiology of PHTS disorders, PTEN encodes a phosphatase that inhibits phosphoinositide 3-kinase/Akt and mTOR signaling pathways, thereby controlling cell proliferation, cell-cycle progression, and apoptosis.2,3 Loss of PTEN function, as seen in CS patients, results in an increased risk for cancer.2 Other genetic diseases, including juvenile polyposis syndrome, Proteus syndrome, tuberous sclerosis, and Peutz-Jeghers syndrome, have phenotypic similarities to PHTS.3 Specifically, loss-of-function mutations of TSC1 and TSC2, tumor suppressor genes associated with tuberous sclerosis, similarly result in dysregulation of mTOR signaling.
Our patient also had some clinical features characteristic of BHDS, such as flesh-colored facial papules, acrochordonlike lesions, and chromophobe renal cell carcinoma.11 Birt-Hogg-Dubé syndrome most often is caused by an autosomal-dominant germline mutation in FLCN, a tumor suppressor gene.11 Interestingly, FLCN interacts with AMP-activated protein kinase to help regulate mTOR signaling, which may explain phenotypic similarities seen in CS and BHDS.12
Because the PHTS disorders and BHDS result in similar functional consequences on the mTOR signaling pathway, patients can present with overlapping clinical features that may be diagnostically challenging. Management includes patient education regarding cancer risk, surveillance for early detection of malignancy, and genetic counseling for family members.2 It is important for clinicians to appreciate phenotypic similarities between PHTS and other disorders affecting mTOR signaling to prevent delays in diagnosis.
- Nosé V. Genodermatosis affecting the skin and mucosa of the head and neck: clinicopathologic, genetic, and molecular aspect—PTEN-hamartoma tumor syndrome/Cowden syndrome. Head Neck Pathol. 2016;10:131-138.
- Porto A, Roider E, Ruzicka T. Cowden syndrome: report of a case and brief review of literature. An Bras Dermatol. 2013;88(6 suppl 1):S52-S55.
- Leslie N, Longy M. Inherited PTEN mutations and the prediction of phenotype. Semin Cell Dev Biol. 2016;52:30-38.
- The National Comprehensive Cancer Network (NCCN) clinical practice guidelines in oncology. genetic/familial high-risk assessment: breast and ovarian (version 1.2017). Published September 19, 2016. Accessed August 11, 2021. https://www.nccn.org/professionals/physician_gls/pdf/genetics_screening.pdf
- Laury AR, Bongiovanni M, Tille J, et al. Thyroid pathology in PTEN-hamartoma tumor syndrome: characteristic findings of a distinct entity. Thyroid. 2011;21:135-144.
- Eng C. PTEN hamartoma tumor syndrome. In: Pagon RA, Adam MP, Ardinger HH, et al, eds. GeneReviews. University of Washington; 2001.
- Golden N, Tjokorda MGB, Sri M, et al. Management of unusual dysplastic gangliocytoma of the cerebellum (Lhermitte-Duclos disease) in a developing country: case report and review of the literature. Asian J Neurosurg. 2016;11:170.
- Biesecker LG, Happle R, Mulliken JB, et al. Proteus syndrome: diagnostic criteria, differential diagnosis, and patient evaluation. Am J Med Genet. 1999;84:389-395.
- Busa T, Milh M, Degardin N, et al. Clinical presentation of PTEN mutations in childhood in the absence of family history of Cowden syndrome. Eur J Paediatr Neurol. 2015;19:188-192.
- Tan MH, Mester JL, Ngeow J, et al. Lifetime cancer risks in individuals with germline PTEN mutations. Clin Cancer Res. 2012;18:400-407.
- Ponti G, Pellacani G, Seidenari S, et al. Cancer-associated genodermatoses: skin neoplasms as clues to hereditary tumor syndromes. Crit Rev Oncol Hematol. 2013;85:239-256.
- Baba M, Hong S, Sharma N, et al. Folliculin encoded by the BHD gene interacts with a binding protein, FNIP1, and AMPK, and is involved in AMPK and mTOR signaling. Proc Natl Acad Sci U S A. 2006;103:15552-15557.
To the Editor:
PTEN hamartoma tumor syndrome (PHTS) encompasses a spectrum of disorders that most commonly are caused by autosomal-dominant germline mutations in the phosphatase and tensin homolog, PTEN, tumor suppressor gene on chromosome 10q23. We describe a patient who presented with clinical features of PHTS and Birt-Hogg-Dubé syndrome (BHDS). Because the genetic mutations associated with both PHTS and BHDS result in altered mammalian target of rapamycin (mTOR) signaling, patients may have overlapping phenotypic features.
A 51-year-old man with a history of multiple carcinomas presented for evaluation of flesh-colored papules on the cheeks, nose, tongue, and hands, in addition to numerous skin tags on the neck, axillae, and lower abdomen bilaterally. His medical history was notable for several nasal and gastrointestinal tract polyps, chromophobe renal cell carcinoma, cutaneous lipomas, atypical carcinoid syndrome of the right lung, and a multinodular thyroid. His family history was notable for small cell lung cancer in his father, breast cancer and pancreatic cancer in his maternal aunt, esophageal cancer in his maternal grandfather, and celiac disease in his daughter.
Clinical examination revealed flesh-colored, dome-shaped papules measuring 1 to 2 mm in diameter on the nose and cheeks (Figure 1). He had hyperkeratotic papules on the dorsal fingers, consistent with acral keratoses. Additionally, multiple flesh-colored papules with a cobblestonelike appearance were noted on the oral mucosa (Figure 2). Other findings included pedunculated papules on the neck, axillae, and lower abdomen bilaterally, consistent with fibroepithelial polyps, as well as hyperpigmented velvety plaques on the axillae, characteristic of acanthosis nigricans (Figure 3). A shave biopsy of a papule on the right cheek revealed a proliferation of plump stellate fibroblasts, small blood vessels, and thick collagen bundles, characteristic of a fibrous papule (Figure 4).
Differential diagnoses for our patient included BHDS and Cowden syndrome (CS). Due to the combination of extensive family history of multiorgan cancers as well as the clinical findings, he was referred to a geneticist for further evaluation. Genetic analysis was positive for a heterozygous mutation variant of uncertain significance in the PTEN gene.
The PHTS disorders include CS, Bannayan-Riley-Ruvalcaba syndrome, Lhermitte-Duclos disease, Proteus syndrome, and Proteus-like syndrome (Table).1-9 Our patient’s clinical findings were indicative of CS, a rare genodermatosis characterized by multiple hamartomas and neoplasms of ectodermal, mesodermal, and endodermal origin.1 Most CS patients develop trichilemmomas of the central face, mucocutaneous papillomatous papules, and acral and plantar keratoses by the third decade of life.1 Importantly, CS patients have an increased risk for breast, thyroid, renal, endometrial, and colorectal cancers, as well as melanoma, with estimated lifetime risks of 85%, 35%, 33%, 28%, 9%, and 6%, respectively.2,10
Regarding the pathophysiology of PHTS disorders, PTEN encodes a phosphatase that inhibits phosphoinositide 3-kinase/Akt and mTOR signaling pathways, thereby controlling cell proliferation, cell-cycle progression, and apoptosis.2,3 Loss of PTEN function, as seen in CS patients, results in an increased risk for cancer.2 Other genetic diseases, including juvenile polyposis syndrome, Proteus syndrome, tuberous sclerosis, and Peutz-Jeghers syndrome, have phenotypic similarities to PHTS.3 Specifically, loss-of-function mutations of TSC1 and TSC2, tumor suppressor genes associated with tuberous sclerosis, similarly result in dysregulation of mTOR signaling.
Our patient also had some clinical features characteristic of BHDS, such as flesh-colored facial papules, acrochordonlike lesions, and chromophobe renal cell carcinoma.11 Birt-Hogg-Dubé syndrome most often is caused by an autosomal-dominant germline mutation in FLCN, a tumor suppressor gene.11 Interestingly, FLCN interacts with AMP-activated protein kinase to help regulate mTOR signaling, which may explain phenotypic similarities seen in CS and BHDS.12
Because the PHTS disorders and BHDS result in similar functional consequences on the mTOR signaling pathway, patients can present with overlapping clinical features that may be diagnostically challenging. Management includes patient education regarding cancer risk, surveillance for early detection of malignancy, and genetic counseling for family members.2 It is important for clinicians to appreciate phenotypic similarities between PHTS and other disorders affecting mTOR signaling to prevent delays in diagnosis.
To the Editor:
PTEN hamartoma tumor syndrome (PHTS) encompasses a spectrum of disorders that most commonly are caused by autosomal-dominant germline mutations in the phosphatase and tensin homolog, PTEN, tumor suppressor gene on chromosome 10q23. We describe a patient who presented with clinical features of PHTS and Birt-Hogg-Dubé syndrome (BHDS). Because the genetic mutations associated with both PHTS and BHDS result in altered mammalian target of rapamycin (mTOR) signaling, patients may have overlapping phenotypic features.
A 51-year-old man with a history of multiple carcinomas presented for evaluation of flesh-colored papules on the cheeks, nose, tongue, and hands, in addition to numerous skin tags on the neck, axillae, and lower abdomen bilaterally. His medical history was notable for several nasal and gastrointestinal tract polyps, chromophobe renal cell carcinoma, cutaneous lipomas, atypical carcinoid syndrome of the right lung, and a multinodular thyroid. His family history was notable for small cell lung cancer in his father, breast cancer and pancreatic cancer in his maternal aunt, esophageal cancer in his maternal grandfather, and celiac disease in his daughter.
Clinical examination revealed flesh-colored, dome-shaped papules measuring 1 to 2 mm in diameter on the nose and cheeks (Figure 1). He had hyperkeratotic papules on the dorsal fingers, consistent with acral keratoses. Additionally, multiple flesh-colored papules with a cobblestonelike appearance were noted on the oral mucosa (Figure 2). Other findings included pedunculated papules on the neck, axillae, and lower abdomen bilaterally, consistent with fibroepithelial polyps, as well as hyperpigmented velvety plaques on the axillae, characteristic of acanthosis nigricans (Figure 3). A shave biopsy of a papule on the right cheek revealed a proliferation of plump stellate fibroblasts, small blood vessels, and thick collagen bundles, characteristic of a fibrous papule (Figure 4).
Differential diagnoses for our patient included BHDS and Cowden syndrome (CS). Due to the combination of extensive family history of multiorgan cancers as well as the clinical findings, he was referred to a geneticist for further evaluation. Genetic analysis was positive for a heterozygous mutation variant of uncertain significance in the PTEN gene.
The PHTS disorders include CS, Bannayan-Riley-Ruvalcaba syndrome, Lhermitte-Duclos disease, Proteus syndrome, and Proteus-like syndrome (Table).1-9 Our patient’s clinical findings were indicative of CS, a rare genodermatosis characterized by multiple hamartomas and neoplasms of ectodermal, mesodermal, and endodermal origin.1 Most CS patients develop trichilemmomas of the central face, mucocutaneous papillomatous papules, and acral and plantar keratoses by the third decade of life.1 Importantly, CS patients have an increased risk for breast, thyroid, renal, endometrial, and colorectal cancers, as well as melanoma, with estimated lifetime risks of 85%, 35%, 33%, 28%, 9%, and 6%, respectively.2,10
Regarding the pathophysiology of PHTS disorders, PTEN encodes a phosphatase that inhibits phosphoinositide 3-kinase/Akt and mTOR signaling pathways, thereby controlling cell proliferation, cell-cycle progression, and apoptosis.2,3 Loss of PTEN function, as seen in CS patients, results in an increased risk for cancer.2 Other genetic diseases, including juvenile polyposis syndrome, Proteus syndrome, tuberous sclerosis, and Peutz-Jeghers syndrome, have phenotypic similarities to PHTS.3 Specifically, loss-of-function mutations of TSC1 and TSC2, tumor suppressor genes associated with tuberous sclerosis, similarly result in dysregulation of mTOR signaling.
Our patient also had some clinical features characteristic of BHDS, such as flesh-colored facial papules, acrochordonlike lesions, and chromophobe renal cell carcinoma.11 Birt-Hogg-Dubé syndrome most often is caused by an autosomal-dominant germline mutation in FLCN, a tumor suppressor gene.11 Interestingly, FLCN interacts with AMP-activated protein kinase to help regulate mTOR signaling, which may explain phenotypic similarities seen in CS and BHDS.12
Because the PHTS disorders and BHDS result in similar functional consequences on the mTOR signaling pathway, patients can present with overlapping clinical features that may be diagnostically challenging. Management includes patient education regarding cancer risk, surveillance for early detection of malignancy, and genetic counseling for family members.2 It is important for clinicians to appreciate phenotypic similarities between PHTS and other disorders affecting mTOR signaling to prevent delays in diagnosis.
- Nosé V. Genodermatosis affecting the skin and mucosa of the head and neck: clinicopathologic, genetic, and molecular aspect—PTEN-hamartoma tumor syndrome/Cowden syndrome. Head Neck Pathol. 2016;10:131-138.
- Porto A, Roider E, Ruzicka T. Cowden syndrome: report of a case and brief review of literature. An Bras Dermatol. 2013;88(6 suppl 1):S52-S55.
- Leslie N, Longy M. Inherited PTEN mutations and the prediction of phenotype. Semin Cell Dev Biol. 2016;52:30-38.
- The National Comprehensive Cancer Network (NCCN) clinical practice guidelines in oncology. genetic/familial high-risk assessment: breast and ovarian (version 1.2017). Published September 19, 2016. Accessed August 11, 2021. https://www.nccn.org/professionals/physician_gls/pdf/genetics_screening.pdf
- Laury AR, Bongiovanni M, Tille J, et al. Thyroid pathology in PTEN-hamartoma tumor syndrome: characteristic findings of a distinct entity. Thyroid. 2011;21:135-144.
- Eng C. PTEN hamartoma tumor syndrome. In: Pagon RA, Adam MP, Ardinger HH, et al, eds. GeneReviews. University of Washington; 2001.
- Golden N, Tjokorda MGB, Sri M, et al. Management of unusual dysplastic gangliocytoma of the cerebellum (Lhermitte-Duclos disease) in a developing country: case report and review of the literature. Asian J Neurosurg. 2016;11:170.
- Biesecker LG, Happle R, Mulliken JB, et al. Proteus syndrome: diagnostic criteria, differential diagnosis, and patient evaluation. Am J Med Genet. 1999;84:389-395.
- Busa T, Milh M, Degardin N, et al. Clinical presentation of PTEN mutations in childhood in the absence of family history of Cowden syndrome. Eur J Paediatr Neurol. 2015;19:188-192.
- Tan MH, Mester JL, Ngeow J, et al. Lifetime cancer risks in individuals with germline PTEN mutations. Clin Cancer Res. 2012;18:400-407.
- Ponti G, Pellacani G, Seidenari S, et al. Cancer-associated genodermatoses: skin neoplasms as clues to hereditary tumor syndromes. Crit Rev Oncol Hematol. 2013;85:239-256.
- Baba M, Hong S, Sharma N, et al. Folliculin encoded by the BHD gene interacts with a binding protein, FNIP1, and AMPK, and is involved in AMPK and mTOR signaling. Proc Natl Acad Sci U S A. 2006;103:15552-15557.
- Nosé V. Genodermatosis affecting the skin and mucosa of the head and neck: clinicopathologic, genetic, and molecular aspect—PTEN-hamartoma tumor syndrome/Cowden syndrome. Head Neck Pathol. 2016;10:131-138.
- Porto A, Roider E, Ruzicka T. Cowden syndrome: report of a case and brief review of literature. An Bras Dermatol. 2013;88(6 suppl 1):S52-S55.
- Leslie N, Longy M. Inherited PTEN mutations and the prediction of phenotype. Semin Cell Dev Biol. 2016;52:30-38.
- The National Comprehensive Cancer Network (NCCN) clinical practice guidelines in oncology. genetic/familial high-risk assessment: breast and ovarian (version 1.2017). Published September 19, 2016. Accessed August 11, 2021. https://www.nccn.org/professionals/physician_gls/pdf/genetics_screening.pdf
- Laury AR, Bongiovanni M, Tille J, et al. Thyroid pathology in PTEN-hamartoma tumor syndrome: characteristic findings of a distinct entity. Thyroid. 2011;21:135-144.
- Eng C. PTEN hamartoma tumor syndrome. In: Pagon RA, Adam MP, Ardinger HH, et al, eds. GeneReviews. University of Washington; 2001.
- Golden N, Tjokorda MGB, Sri M, et al. Management of unusual dysplastic gangliocytoma of the cerebellum (Lhermitte-Duclos disease) in a developing country: case report and review of the literature. Asian J Neurosurg. 2016;11:170.
- Biesecker LG, Happle R, Mulliken JB, et al. Proteus syndrome: diagnostic criteria, differential diagnosis, and patient evaluation. Am J Med Genet. 1999;84:389-395.
- Busa T, Milh M, Degardin N, et al. Clinical presentation of PTEN mutations in childhood in the absence of family history of Cowden syndrome. Eur J Paediatr Neurol. 2015;19:188-192.
- Tan MH, Mester JL, Ngeow J, et al. Lifetime cancer risks in individuals with germline PTEN mutations. Clin Cancer Res. 2012;18:400-407.
- Ponti G, Pellacani G, Seidenari S, et al. Cancer-associated genodermatoses: skin neoplasms as clues to hereditary tumor syndromes. Crit Rev Oncol Hematol. 2013;85:239-256.
- Baba M, Hong S, Sharma N, et al. Folliculin encoded by the BHD gene interacts with a binding protein, FNIP1, and AMPK, and is involved in AMPK and mTOR signaling. Proc Natl Acad Sci U S A. 2006;103:15552-15557.
PRACTICE POINTS
- PTEN hamartoma tumor syndrome (PHTS) represents a spectrum of disorders caused by autosomal-dominant germline mutations in PTEN.
- Our patient presented with phenotypic features of PHTS and Birt-Hogg-Dubé syndrome. Given that both syndromes cause alterations in mammalian target of rapamycin signaling, overlapping phenotypic features may be seen.
- Recognizing overlapping phenotypic features of these syndromes will allow for timely diagnosis and surveillance for malignancy.
Friedreich’s ataxia treatment shows extended benefit
according to results of a clinical trial presented as a late-breaking abstract at the International Congress of Parkinson’s Disease and Movement Disorders.
The study, labeled the Delayed-Start Study, is an extension study of the two-part MOXIE phase 2 trial of omaveloxolone.
“This study shows two things,” said David Lynch, MD, PhD, of Children’s Hospital of Philadelphia. “It doesn’t matter when you started omaveloxolone for you to see a benefit; and that the benefit that the active group saw in the first part of the study was maintained as they went into the delayed-start part. So in fact omaveloxolone does modify the long-term behavior of the disease.”
Friedreich’s ataxia only affects about 22,000 people worldwide, and children typically present between the ages of 5 and 15, Dr. Lynch said.
The extension study included 73 patients who completed either of the first two parts of the MOXIe trial. The MOXIe trial randomized patients on a 3:1 basis to either omaveloxolone 2.5-300 mg or placebo for 12 weeks in the first part. The second part was a double-blind trial of 103 patients randomized on a 1:1 basis to 150 mg omaveloxolone or placebo for 48 weeks. Participants had a baseline modified Friedreich’s ataxia scale (mFARS) of 20-80 and were aged 16-40 years.
Patients in the extension study did not have severe pes cavus. The extension study was a 72-week evaluation of patients who were in either the treatment or placebo groups in the first two parts. There was a 4-week off-treatment period between the end of MOXIe part 2 and the beginning of the extension study, in which all patients received omaveloxolone.
At the end of the placebo-controlled study, patients taking omaveloxolone showed a –2.18-point (±0.96) difference in improvement in mFARS score (P = .027), compared with the placebo group, which was preserved at the end of the delayed-start period, with a –2.92-point (±2.13) improvement (P = .179), Dr. Lynch said.
In the extension study, former placebo patients who went on omaveloxolone had annualized mFARS slopes similar to the previously treated patients – 0.29 (±0.68) and 0.17 (±0.61), respectively (P = .85) – from weeks 48 to 144, Dr. Lynch said.
“This study showed that, when analyzed in a delayed-start fashion, it does not matter when you start omaveloxolone to see a benefit: Each cohort benefited almost equally once they started the drug,” Dr. Lynch said in an interview. “Also, in both groups, once they started omaveloxolone, they changed slower than people in natural history studies.”
A clinically meaningful difference?
Reached for comment, Massimo Pandolfo, MD, a neurologist at McGill University, Montreal, noted that the Delayed-Start Study included only patients without pes cavus, an indication that the patients had less severe disease. “It would be important to see how overall patients with Friedreich’s ataxia would have responded to the medication without this kind of selection,” Dr. Pandolfo said in an interview.
He also noted that the seemingly modest improvement in mFARS score could be an issue. “It’s a very difficult question: What is a clinically meaningful difference in this kind of rating scale? I would argue that probably 2 points is not a huge difference by itself, but it may be meaningful and one indicator of that is that if it was accompanied by also a significant difference in activities of daily living scale.”
In any event, Dr. Pandolfo said this is the first medication for Friedreich’s ataxia that has “survived” a randomized clinical trial.
Dr. Lynch said the study sponsor, Reata, may prepare a new drug application for omaveloxolone in patients ages 16 and older. “That would leave a need for investigation in younger FA patients.”
Dr. Lynch disclosed that his institution receives a grant from trial sponsor Reata to conduct the MOXIe trial. Dr. Pandolfo reports financial relationships with Design Therapeutics, Exicure and Voyager Therapeutics.
according to results of a clinical trial presented as a late-breaking abstract at the International Congress of Parkinson’s Disease and Movement Disorders.
The study, labeled the Delayed-Start Study, is an extension study of the two-part MOXIE phase 2 trial of omaveloxolone.
“This study shows two things,” said David Lynch, MD, PhD, of Children’s Hospital of Philadelphia. “It doesn’t matter when you started omaveloxolone for you to see a benefit; and that the benefit that the active group saw in the first part of the study was maintained as they went into the delayed-start part. So in fact omaveloxolone does modify the long-term behavior of the disease.”
Friedreich’s ataxia only affects about 22,000 people worldwide, and children typically present between the ages of 5 and 15, Dr. Lynch said.
The extension study included 73 patients who completed either of the first two parts of the MOXIe trial. The MOXIe trial randomized patients on a 3:1 basis to either omaveloxolone 2.5-300 mg or placebo for 12 weeks in the first part. The second part was a double-blind trial of 103 patients randomized on a 1:1 basis to 150 mg omaveloxolone or placebo for 48 weeks. Participants had a baseline modified Friedreich’s ataxia scale (mFARS) of 20-80 and were aged 16-40 years.
Patients in the extension study did not have severe pes cavus. The extension study was a 72-week evaluation of patients who were in either the treatment or placebo groups in the first two parts. There was a 4-week off-treatment period between the end of MOXIe part 2 and the beginning of the extension study, in which all patients received omaveloxolone.
At the end of the placebo-controlled study, patients taking omaveloxolone showed a –2.18-point (±0.96) difference in improvement in mFARS score (P = .027), compared with the placebo group, which was preserved at the end of the delayed-start period, with a –2.92-point (±2.13) improvement (P = .179), Dr. Lynch said.
In the extension study, former placebo patients who went on omaveloxolone had annualized mFARS slopes similar to the previously treated patients – 0.29 (±0.68) and 0.17 (±0.61), respectively (P = .85) – from weeks 48 to 144, Dr. Lynch said.
“This study showed that, when analyzed in a delayed-start fashion, it does not matter when you start omaveloxolone to see a benefit: Each cohort benefited almost equally once they started the drug,” Dr. Lynch said in an interview. “Also, in both groups, once they started omaveloxolone, they changed slower than people in natural history studies.”
A clinically meaningful difference?
Reached for comment, Massimo Pandolfo, MD, a neurologist at McGill University, Montreal, noted that the Delayed-Start Study included only patients without pes cavus, an indication that the patients had less severe disease. “It would be important to see how overall patients with Friedreich’s ataxia would have responded to the medication without this kind of selection,” Dr. Pandolfo said in an interview.
He also noted that the seemingly modest improvement in mFARS score could be an issue. “It’s a very difficult question: What is a clinically meaningful difference in this kind of rating scale? I would argue that probably 2 points is not a huge difference by itself, but it may be meaningful and one indicator of that is that if it was accompanied by also a significant difference in activities of daily living scale.”
In any event, Dr. Pandolfo said this is the first medication for Friedreich’s ataxia that has “survived” a randomized clinical trial.
Dr. Lynch said the study sponsor, Reata, may prepare a new drug application for omaveloxolone in patients ages 16 and older. “That would leave a need for investigation in younger FA patients.”
Dr. Lynch disclosed that his institution receives a grant from trial sponsor Reata to conduct the MOXIe trial. Dr. Pandolfo reports financial relationships with Design Therapeutics, Exicure and Voyager Therapeutics.
according to results of a clinical trial presented as a late-breaking abstract at the International Congress of Parkinson’s Disease and Movement Disorders.
The study, labeled the Delayed-Start Study, is an extension study of the two-part MOXIE phase 2 trial of omaveloxolone.
“This study shows two things,” said David Lynch, MD, PhD, of Children’s Hospital of Philadelphia. “It doesn’t matter when you started omaveloxolone for you to see a benefit; and that the benefit that the active group saw in the first part of the study was maintained as they went into the delayed-start part. So in fact omaveloxolone does modify the long-term behavior of the disease.”
Friedreich’s ataxia only affects about 22,000 people worldwide, and children typically present between the ages of 5 and 15, Dr. Lynch said.
The extension study included 73 patients who completed either of the first two parts of the MOXIe trial. The MOXIe trial randomized patients on a 3:1 basis to either omaveloxolone 2.5-300 mg or placebo for 12 weeks in the first part. The second part was a double-blind trial of 103 patients randomized on a 1:1 basis to 150 mg omaveloxolone or placebo for 48 weeks. Participants had a baseline modified Friedreich’s ataxia scale (mFARS) of 20-80 and were aged 16-40 years.
Patients in the extension study did not have severe pes cavus. The extension study was a 72-week evaluation of patients who were in either the treatment or placebo groups in the first two parts. There was a 4-week off-treatment period between the end of MOXIe part 2 and the beginning of the extension study, in which all patients received omaveloxolone.
At the end of the placebo-controlled study, patients taking omaveloxolone showed a –2.18-point (±0.96) difference in improvement in mFARS score (P = .027), compared with the placebo group, which was preserved at the end of the delayed-start period, with a –2.92-point (±2.13) improvement (P = .179), Dr. Lynch said.
In the extension study, former placebo patients who went on omaveloxolone had annualized mFARS slopes similar to the previously treated patients – 0.29 (±0.68) and 0.17 (±0.61), respectively (P = .85) – from weeks 48 to 144, Dr. Lynch said.
“This study showed that, when analyzed in a delayed-start fashion, it does not matter when you start omaveloxolone to see a benefit: Each cohort benefited almost equally once they started the drug,” Dr. Lynch said in an interview. “Also, in both groups, once they started omaveloxolone, they changed slower than people in natural history studies.”
A clinically meaningful difference?
Reached for comment, Massimo Pandolfo, MD, a neurologist at McGill University, Montreal, noted that the Delayed-Start Study included only patients without pes cavus, an indication that the patients had less severe disease. “It would be important to see how overall patients with Friedreich’s ataxia would have responded to the medication without this kind of selection,” Dr. Pandolfo said in an interview.
He also noted that the seemingly modest improvement in mFARS score could be an issue. “It’s a very difficult question: What is a clinically meaningful difference in this kind of rating scale? I would argue that probably 2 points is not a huge difference by itself, but it may be meaningful and one indicator of that is that if it was accompanied by also a significant difference in activities of daily living scale.”
In any event, Dr. Pandolfo said this is the first medication for Friedreich’s ataxia that has “survived” a randomized clinical trial.
Dr. Lynch said the study sponsor, Reata, may prepare a new drug application for omaveloxolone in patients ages 16 and older. “That would leave a need for investigation in younger FA patients.”
Dr. Lynch disclosed that his institution receives a grant from trial sponsor Reata to conduct the MOXIe trial. Dr. Pandolfo reports financial relationships with Design Therapeutics, Exicure and Voyager Therapeutics.
FROM MDS VIRTUAL CONGRESS 2021
Lipid levels tied to ALS risk
, new research shows.
The study also linked a higher ratio of total cholesterol to HDL with an increased risk for ALS. These findings, investigators noted, point to potential future biomarkers in screening for ALS and perhaps an approach to reduce risk or delay onset of ALS in the longer term.
“They may help build a biochemical picture of what’s going on and who might be at risk of developing ALS in the near future, particularly in people with a genetic predisposition to ALS,” study investigator Alexander G. Thompson, DPhil, Medical Research Council clinician scientist, Nuffield Department of Clinical Neurosciences, University of Oxford, United Kingdom, said in an interview.
He emphasized that although the current observational study cannot show cause and effect, such a relationship may exist.
The study was published online September 13 in the Journal of Neurology, Neurosurgery and Psychiatry.
Registry data
ALS is a disorder of progressive degeneration of upper and lower motor neurons. Genetic variants account for fewer than 15% of cases. The factors that are associated with the greatest risk are unclear.
To investigate, the researchers used data from the UK Biobank, a prospective cohort study of persons aged 39-72 years. Participants underwent an initial assessment between March 2006 and October 2010 and were followed for a median of 11.9 years.
In addition to providing demographic and health information, participants provided blood samples for biochemical analysis. This included measurements of total cholesterol, HDL, low-density lipoprotein (LDL) cholesterol, triglycerides, apoA1, apolipoprotein B (apoB), A1c, and creatinine.
Researchers used diagnostic codes in inpatient health records and death certificate information to verify ALS diagnoses.
The analysis included data from 502,409 participants. The mean age of the participants was 58 years, and 54.4% were women. During follow-up, 343 participants were diagnosed with ALS, yielding a crude incidence of 5.85 per 100,000 per year (95% confidence interval, 5.25-6.51).
After controlling for sex and age, results showed that higher HDL (hazard ratio, 0.84; 95% CI, 0.73-0.96; P = .010) and higher apoA1 (HR, 0.83; 95% CI, 0.72-0.94, P = .005) were associated with a reduced risk for subsequent ALS.
A higher ratio of total cholesterol to HDL was associated with increased ALS risk.
A rise in neurofilaments and other markers of neuronal loss typically occur within about a year of ALS symptom onset. To ensure that they were capturing participants whose blood samples were taken before the onset of neurodegeneration, the researchers performed a secondary analysis that excluded ALS diagnoses within 5 years of the baseline study visit.
Results of the analysis were largely consistent with models incorporating all participants with regard to magnitude and direction of associations. In addition, the findings persisted in models that controlled for statin use, smoking, and vascular disease.
Mechanism unclear
To more closely examine lipid status prior to ALS diagnosis, the researchers performed a nested case-control analysis that involved matching each participant who developed ALS with 20 participants of similar age, sex, and time of enrollment who did not develop the disease.
Linear models showed that levels of LDL and apoB, which are closely correlated, decrease over time in those who developed ALS. This was not the case for HDL and apoA1. “This suggests LDL levels are going down, and we think it’s happening quite some time before symptoms start, even before neurodegeneration starts,” said Dr. Thompson.
How blood lipid levels correlate with ALS risk is unclear. Dr. Thompson noted that LDL is an oxidative stressor and can provoke inflammation, whereas HDL is an antioxidant that is involved in healing. However, given that LDL and HDL don’t cross into the brain in great amounts, “the lipid changes may be a reflection of something else going on that contributes to the risk of ALS,” he said.
More evidence of a causal relationship is needed before any clinical implications can be drawn, including the potential manipulation of lipid levels to prevent ALS, said Dr. Thompson. In addition, even were such a relationship to be established, altering lipid levels in a healthy individual who has no family history of ALS would be unlikely to alter risk.
Dr. Thompson added that among those with a genetic predisposition, lipid changes “may be a marker or clue that something’s going wrong in the nervous system and that ALS might be about to start. That would be the ideal time to treat people at risk of ALS with gene therapy.”
Metabolism gone awry
Commenting on the findings, Stephen Goutman, MD, director, Pranger ALS Clinic, associate professor of neurology, Neuromuscular Program, University of Michigan, Ann Arbor, called the study “very interesting.” Of particular note was a trend of decreasing LDL and apoB levels prior to an ALS diagnosis, said Dr. Goutman.
The results are in agreement with several studies that show an alteration in metabolism in individuals with ALS, he said. “These altered metabolic pathways may provide some signal that something has gone awry,” he commented.
He agreed that an “ultimate goal” is to identify factors or biomarkers that can be used to predict whether individuals will develop ALS and to enable intervention to decrease the risk.
This new research highlights the value of population-based registries and large prospective cohorts, said Dr. Goutman. “These help to better define the genetic, environmental, and metabolic factors that increase and predict ALS risk,” he said.
But more work is needed, said Dr. Goutman. He noted that in the study, only 192 participants were diagnosed with ALS more than 5 years after enrollment. “This means additional large cohort studies are needed, especially those that reflect the diversity of the population, for us to solve the mystery of ALS and to prevent it,” he said.
Dr. Thompson and Dr. Goutman have disclosed no relevant financial relationships.
A version of this article first appeared on Medscape.com.
, new research shows.
The study also linked a higher ratio of total cholesterol to HDL with an increased risk for ALS. These findings, investigators noted, point to potential future biomarkers in screening for ALS and perhaps an approach to reduce risk or delay onset of ALS in the longer term.
“They may help build a biochemical picture of what’s going on and who might be at risk of developing ALS in the near future, particularly in people with a genetic predisposition to ALS,” study investigator Alexander G. Thompson, DPhil, Medical Research Council clinician scientist, Nuffield Department of Clinical Neurosciences, University of Oxford, United Kingdom, said in an interview.
He emphasized that although the current observational study cannot show cause and effect, such a relationship may exist.
The study was published online September 13 in the Journal of Neurology, Neurosurgery and Psychiatry.
Registry data
ALS is a disorder of progressive degeneration of upper and lower motor neurons. Genetic variants account for fewer than 15% of cases. The factors that are associated with the greatest risk are unclear.
To investigate, the researchers used data from the UK Biobank, a prospective cohort study of persons aged 39-72 years. Participants underwent an initial assessment between March 2006 and October 2010 and were followed for a median of 11.9 years.
In addition to providing demographic and health information, participants provided blood samples for biochemical analysis. This included measurements of total cholesterol, HDL, low-density lipoprotein (LDL) cholesterol, triglycerides, apoA1, apolipoprotein B (apoB), A1c, and creatinine.
Researchers used diagnostic codes in inpatient health records and death certificate information to verify ALS diagnoses.
The analysis included data from 502,409 participants. The mean age of the participants was 58 years, and 54.4% were women. During follow-up, 343 participants were diagnosed with ALS, yielding a crude incidence of 5.85 per 100,000 per year (95% confidence interval, 5.25-6.51).
After controlling for sex and age, results showed that higher HDL (hazard ratio, 0.84; 95% CI, 0.73-0.96; P = .010) and higher apoA1 (HR, 0.83; 95% CI, 0.72-0.94, P = .005) were associated with a reduced risk for subsequent ALS.
A higher ratio of total cholesterol to HDL was associated with increased ALS risk.
A rise in neurofilaments and other markers of neuronal loss typically occur within about a year of ALS symptom onset. To ensure that they were capturing participants whose blood samples were taken before the onset of neurodegeneration, the researchers performed a secondary analysis that excluded ALS diagnoses within 5 years of the baseline study visit.
Results of the analysis were largely consistent with models incorporating all participants with regard to magnitude and direction of associations. In addition, the findings persisted in models that controlled for statin use, smoking, and vascular disease.
Mechanism unclear
To more closely examine lipid status prior to ALS diagnosis, the researchers performed a nested case-control analysis that involved matching each participant who developed ALS with 20 participants of similar age, sex, and time of enrollment who did not develop the disease.
Linear models showed that levels of LDL and apoB, which are closely correlated, decrease over time in those who developed ALS. This was not the case for HDL and apoA1. “This suggests LDL levels are going down, and we think it’s happening quite some time before symptoms start, even before neurodegeneration starts,” said Dr. Thompson.
How blood lipid levels correlate with ALS risk is unclear. Dr. Thompson noted that LDL is an oxidative stressor and can provoke inflammation, whereas HDL is an antioxidant that is involved in healing. However, given that LDL and HDL don’t cross into the brain in great amounts, “the lipid changes may be a reflection of something else going on that contributes to the risk of ALS,” he said.
More evidence of a causal relationship is needed before any clinical implications can be drawn, including the potential manipulation of lipid levels to prevent ALS, said Dr. Thompson. In addition, even were such a relationship to be established, altering lipid levels in a healthy individual who has no family history of ALS would be unlikely to alter risk.
Dr. Thompson added that among those with a genetic predisposition, lipid changes “may be a marker or clue that something’s going wrong in the nervous system and that ALS might be about to start. That would be the ideal time to treat people at risk of ALS with gene therapy.”
Metabolism gone awry
Commenting on the findings, Stephen Goutman, MD, director, Pranger ALS Clinic, associate professor of neurology, Neuromuscular Program, University of Michigan, Ann Arbor, called the study “very interesting.” Of particular note was a trend of decreasing LDL and apoB levels prior to an ALS diagnosis, said Dr. Goutman.
The results are in agreement with several studies that show an alteration in metabolism in individuals with ALS, he said. “These altered metabolic pathways may provide some signal that something has gone awry,” he commented.
He agreed that an “ultimate goal” is to identify factors or biomarkers that can be used to predict whether individuals will develop ALS and to enable intervention to decrease the risk.
This new research highlights the value of population-based registries and large prospective cohorts, said Dr. Goutman. “These help to better define the genetic, environmental, and metabolic factors that increase and predict ALS risk,” he said.
But more work is needed, said Dr. Goutman. He noted that in the study, only 192 participants were diagnosed with ALS more than 5 years after enrollment. “This means additional large cohort studies are needed, especially those that reflect the diversity of the population, for us to solve the mystery of ALS and to prevent it,” he said.
Dr. Thompson and Dr. Goutman have disclosed no relevant financial relationships.
A version of this article first appeared on Medscape.com.
, new research shows.
The study also linked a higher ratio of total cholesterol to HDL with an increased risk for ALS. These findings, investigators noted, point to potential future biomarkers in screening for ALS and perhaps an approach to reduce risk or delay onset of ALS in the longer term.
“They may help build a biochemical picture of what’s going on and who might be at risk of developing ALS in the near future, particularly in people with a genetic predisposition to ALS,” study investigator Alexander G. Thompson, DPhil, Medical Research Council clinician scientist, Nuffield Department of Clinical Neurosciences, University of Oxford, United Kingdom, said in an interview.
He emphasized that although the current observational study cannot show cause and effect, such a relationship may exist.
The study was published online September 13 in the Journal of Neurology, Neurosurgery and Psychiatry.
Registry data
ALS is a disorder of progressive degeneration of upper and lower motor neurons. Genetic variants account for fewer than 15% of cases. The factors that are associated with the greatest risk are unclear.
To investigate, the researchers used data from the UK Biobank, a prospective cohort study of persons aged 39-72 years. Participants underwent an initial assessment between March 2006 and October 2010 and were followed for a median of 11.9 years.
In addition to providing demographic and health information, participants provided blood samples for biochemical analysis. This included measurements of total cholesterol, HDL, low-density lipoprotein (LDL) cholesterol, triglycerides, apoA1, apolipoprotein B (apoB), A1c, and creatinine.
Researchers used diagnostic codes in inpatient health records and death certificate information to verify ALS diagnoses.
The analysis included data from 502,409 participants. The mean age of the participants was 58 years, and 54.4% were women. During follow-up, 343 participants were diagnosed with ALS, yielding a crude incidence of 5.85 per 100,000 per year (95% confidence interval, 5.25-6.51).
After controlling for sex and age, results showed that higher HDL (hazard ratio, 0.84; 95% CI, 0.73-0.96; P = .010) and higher apoA1 (HR, 0.83; 95% CI, 0.72-0.94, P = .005) were associated with a reduced risk for subsequent ALS.
A higher ratio of total cholesterol to HDL was associated with increased ALS risk.
A rise in neurofilaments and other markers of neuronal loss typically occur within about a year of ALS symptom onset. To ensure that they were capturing participants whose blood samples were taken before the onset of neurodegeneration, the researchers performed a secondary analysis that excluded ALS diagnoses within 5 years of the baseline study visit.
Results of the analysis were largely consistent with models incorporating all participants with regard to magnitude and direction of associations. In addition, the findings persisted in models that controlled for statin use, smoking, and vascular disease.
Mechanism unclear
To more closely examine lipid status prior to ALS diagnosis, the researchers performed a nested case-control analysis that involved matching each participant who developed ALS with 20 participants of similar age, sex, and time of enrollment who did not develop the disease.
Linear models showed that levels of LDL and apoB, which are closely correlated, decrease over time in those who developed ALS. This was not the case for HDL and apoA1. “This suggests LDL levels are going down, and we think it’s happening quite some time before symptoms start, even before neurodegeneration starts,” said Dr. Thompson.
How blood lipid levels correlate with ALS risk is unclear. Dr. Thompson noted that LDL is an oxidative stressor and can provoke inflammation, whereas HDL is an antioxidant that is involved in healing. However, given that LDL and HDL don’t cross into the brain in great amounts, “the lipid changes may be a reflection of something else going on that contributes to the risk of ALS,” he said.
More evidence of a causal relationship is needed before any clinical implications can be drawn, including the potential manipulation of lipid levels to prevent ALS, said Dr. Thompson. In addition, even were such a relationship to be established, altering lipid levels in a healthy individual who has no family history of ALS would be unlikely to alter risk.
Dr. Thompson added that among those with a genetic predisposition, lipid changes “may be a marker or clue that something’s going wrong in the nervous system and that ALS might be about to start. That would be the ideal time to treat people at risk of ALS with gene therapy.”
Metabolism gone awry
Commenting on the findings, Stephen Goutman, MD, director, Pranger ALS Clinic, associate professor of neurology, Neuromuscular Program, University of Michigan, Ann Arbor, called the study “very interesting.” Of particular note was a trend of decreasing LDL and apoB levels prior to an ALS diagnosis, said Dr. Goutman.
The results are in agreement with several studies that show an alteration in metabolism in individuals with ALS, he said. “These altered metabolic pathways may provide some signal that something has gone awry,” he commented.
He agreed that an “ultimate goal” is to identify factors or biomarkers that can be used to predict whether individuals will develop ALS and to enable intervention to decrease the risk.
This new research highlights the value of population-based registries and large prospective cohorts, said Dr. Goutman. “These help to better define the genetic, environmental, and metabolic factors that increase and predict ALS risk,” he said.
But more work is needed, said Dr. Goutman. He noted that in the study, only 192 participants were diagnosed with ALS more than 5 years after enrollment. “This means additional large cohort studies are needed, especially those that reflect the diversity of the population, for us to solve the mystery of ALS and to prevent it,” he said.
Dr. Thompson and Dr. Goutman have disclosed no relevant financial relationships.
A version of this article first appeared on Medscape.com.
From Journal of Neurology, Neurosurgery, and Psychiatry
Clinical genetic testing for skin disorders continues to advance
and families of pediatric patients to navigate the landscape.
“Testing options range from targeted variant testing and single-gene testing to exome and genome sequencing,” Gabriele Richard, MD, said at the annual meeting of the Society for Pediatric Dermatology. “It is not always easy to determine which testing is right.”
Increasingly, clinical genomic tests, including exome and genome sequencing, are used for patients with complex phenotypes, and possibly multiple disorders, who might have no diagnosis despite extensive prior testing, said Dr. Richard, medical director at Gaithersburg, Md.–based GeneDx., a molecular diagnostic laboratory that performs comprehensive testing for rare genetic disorders. These tests are also being used more for first-line testing in critically ill patients in the neonatal and pediatric intensive care units, and “have heralded a whole new era of gene and disease discovery,” she added.
Targeted variant testing is used for known familial variants, to test family members for carrier status and segregation, and to make a prenatal diagnosis, she said. Single-gene testing is available for most genes and has its place for conditions that can be clinically well-recognized, such as ichthyosis vulgaris, Darier disease, or Papillon-Lefèvre syndrome.
Specific tests for identifying gene deletions or duplications are exon-level microarrays, multiplex ligation-dependent probe amplification (MLPA), and chromosomal microarray analysis. “The latter has been successful in identifying diseases causing chromosomal abnormalities in over 10% of cases overall,” Dr. Richard said. An example of a skin disorder is X-linked ichthyosis caused by a deletion of the steroid sulfatase locus in more than 95% of affected males, she said.
“However, the current staple of molecular diagnostic testing is multigene next-generation sequencing (NGS) panels, which allow you to interrogate two to hundreds of genes concurrently, including sequencing and deletion duplication testing.” These tests are the most cost effective, she said, and are available for almost any genodermatosis or group of disorders with overlapping phenotypes, such as albinism or ichthyosis, epidermolysis bullosa and skin fragility, ectodermal dysplasia, or porphyria. According to Dr. Richard, the diagnostic outcomes of NGS panels mainly depend on test indication, panel size and gene curation, age of onset, and prevailing inheritance pattern of disorders.
Her recommended criteria for distinguishing the myriad of available NGS panels include checking gene content, technical sensitivity of sequencing and deletion/duplication analysis, quality of variant interpretation and reporting, turn-around time, and available familial follow-up testing. “If a family might consider future prenatal diagnosis, choose the lab that performs prenatal and diagnostic testing,” Dr. Richard said. “Equally important are client services such as ease of ordering, insurance coverage, and the ability to determine out-of-pocket cost to patients.”
Resources that enable consumers to compare panel content, methodology, turnaround time, and other parameters include the Genetic Testing Registry (GTR) operated by the National Center for Biotechnology Information, and Concert Genetics, a genetic testing company. The National Society of Genetic Counselors also offers a searchable database for finding a genetic counselor.
Exome sequencing includes the coding sequences of about 20,000 genes and has an average depth of 50 to about 150 reads. “It is a phenotype-driven test where only select variants are being reported fitting the phenotype,” Dr. Richard said. “The outcome of exome and genome sequencing much depends on optimization of bioinformatic pipelines and tools.” Besides small sequence variants, exome sequencing is able to identify a variety of different types of disease-causing variants, such as gene copy number variants seen in about 6% of positive cases, mosaicism, regions of homozygosity, uniparental disomy, and other unusual events and is cost effective.
Whole-genome sequencing, meanwhile, includes the entire genome, particularly noncoding regions, and has an average depth of more than 30 reads. “It’s based on single-molecule sequencing, has longer reads and more uniform coverage, compared to exome sequencing,” she said. “Higher cost, variant interpretation, and lack of coverage by payers are still presenting challenges for genome sequencing.” Genome sequencing can be done in a day or less.
According to diagnostic outcomes based on 280,000 individuals including 125,000 probands from GeneDx data, a definitive diagnosis was made in 26% of probands, of which 2.8% had more than one diagnostic finding and 1.8% had actionable secondary findings. In addition, 7% of the variants were found in candidate genes; 31% of probands had variants of uncertain significance, while 36% tested negative. “Nevertheless, the diagnostic yield of exome sequencing depends on the phenotype and cohort studied,” Dr. Richard continued.
At her company, she said, the highest positive rate is for multiple congenital anomalies (34%), skeletal system abnormalities (30%), and nervous system abnormalities (29%). Trio testing – the concurrent analysis of both biological parents and proband for all genes – “is a critical factor for success,” she added. “It not only improves the variant calling because we have three times the data and increases test sensitivity, it also provides more certain results, determines inheritance and allows for detection of parental mosaicism.”
According to Dr. Richard, trio testing has a one-third higher diagnostic rate than sequencing of the proband alone. Citing a published prospective study that compiled data from eight different exome- and genome-sequencing studies in critically ill neonates and children, trio testing made it possible to make a genetic diagnosis in up to 58% of children.
Whole-genome sequencing is estimated to have a 5%-10% higher diagnostic rate than exome sequencing. “However, we are still a ways away from using it as a routine diagnostic test for all test indications,” Dr. Richard said. “Automation, special bioinformatics algorithms and databases, and combination of genome sequencing with mRNA sequencing are being explored and built to further improve the diagnostic yield.”
Dr. Richard had no disclosures other than being an employee of GeneDx.
and families of pediatric patients to navigate the landscape.
“Testing options range from targeted variant testing and single-gene testing to exome and genome sequencing,” Gabriele Richard, MD, said at the annual meeting of the Society for Pediatric Dermatology. “It is not always easy to determine which testing is right.”
Increasingly, clinical genomic tests, including exome and genome sequencing, are used for patients with complex phenotypes, and possibly multiple disorders, who might have no diagnosis despite extensive prior testing, said Dr. Richard, medical director at Gaithersburg, Md.–based GeneDx., a molecular diagnostic laboratory that performs comprehensive testing for rare genetic disorders. These tests are also being used more for first-line testing in critically ill patients in the neonatal and pediatric intensive care units, and “have heralded a whole new era of gene and disease discovery,” she added.
Targeted variant testing is used for known familial variants, to test family members for carrier status and segregation, and to make a prenatal diagnosis, she said. Single-gene testing is available for most genes and has its place for conditions that can be clinically well-recognized, such as ichthyosis vulgaris, Darier disease, or Papillon-Lefèvre syndrome.
Specific tests for identifying gene deletions or duplications are exon-level microarrays, multiplex ligation-dependent probe amplification (MLPA), and chromosomal microarray analysis. “The latter has been successful in identifying diseases causing chromosomal abnormalities in over 10% of cases overall,” Dr. Richard said. An example of a skin disorder is X-linked ichthyosis caused by a deletion of the steroid sulfatase locus in more than 95% of affected males, she said.
“However, the current staple of molecular diagnostic testing is multigene next-generation sequencing (NGS) panels, which allow you to interrogate two to hundreds of genes concurrently, including sequencing and deletion duplication testing.” These tests are the most cost effective, she said, and are available for almost any genodermatosis or group of disorders with overlapping phenotypes, such as albinism or ichthyosis, epidermolysis bullosa and skin fragility, ectodermal dysplasia, or porphyria. According to Dr. Richard, the diagnostic outcomes of NGS panels mainly depend on test indication, panel size and gene curation, age of onset, and prevailing inheritance pattern of disorders.
Her recommended criteria for distinguishing the myriad of available NGS panels include checking gene content, technical sensitivity of sequencing and deletion/duplication analysis, quality of variant interpretation and reporting, turn-around time, and available familial follow-up testing. “If a family might consider future prenatal diagnosis, choose the lab that performs prenatal and diagnostic testing,” Dr. Richard said. “Equally important are client services such as ease of ordering, insurance coverage, and the ability to determine out-of-pocket cost to patients.”
Resources that enable consumers to compare panel content, methodology, turnaround time, and other parameters include the Genetic Testing Registry (GTR) operated by the National Center for Biotechnology Information, and Concert Genetics, a genetic testing company. The National Society of Genetic Counselors also offers a searchable database for finding a genetic counselor.
Exome sequencing includes the coding sequences of about 20,000 genes and has an average depth of 50 to about 150 reads. “It is a phenotype-driven test where only select variants are being reported fitting the phenotype,” Dr. Richard said. “The outcome of exome and genome sequencing much depends on optimization of bioinformatic pipelines and tools.” Besides small sequence variants, exome sequencing is able to identify a variety of different types of disease-causing variants, such as gene copy number variants seen in about 6% of positive cases, mosaicism, regions of homozygosity, uniparental disomy, and other unusual events and is cost effective.
Whole-genome sequencing, meanwhile, includes the entire genome, particularly noncoding regions, and has an average depth of more than 30 reads. “It’s based on single-molecule sequencing, has longer reads and more uniform coverage, compared to exome sequencing,” she said. “Higher cost, variant interpretation, and lack of coverage by payers are still presenting challenges for genome sequencing.” Genome sequencing can be done in a day or less.
According to diagnostic outcomes based on 280,000 individuals including 125,000 probands from GeneDx data, a definitive diagnosis was made in 26% of probands, of which 2.8% had more than one diagnostic finding and 1.8% had actionable secondary findings. In addition, 7% of the variants were found in candidate genes; 31% of probands had variants of uncertain significance, while 36% tested negative. “Nevertheless, the diagnostic yield of exome sequencing depends on the phenotype and cohort studied,” Dr. Richard continued.
At her company, she said, the highest positive rate is for multiple congenital anomalies (34%), skeletal system abnormalities (30%), and nervous system abnormalities (29%). Trio testing – the concurrent analysis of both biological parents and proband for all genes – “is a critical factor for success,” she added. “It not only improves the variant calling because we have three times the data and increases test sensitivity, it also provides more certain results, determines inheritance and allows for detection of parental mosaicism.”
According to Dr. Richard, trio testing has a one-third higher diagnostic rate than sequencing of the proband alone. Citing a published prospective study that compiled data from eight different exome- and genome-sequencing studies in critically ill neonates and children, trio testing made it possible to make a genetic diagnosis in up to 58% of children.
Whole-genome sequencing is estimated to have a 5%-10% higher diagnostic rate than exome sequencing. “However, we are still a ways away from using it as a routine diagnostic test for all test indications,” Dr. Richard said. “Automation, special bioinformatics algorithms and databases, and combination of genome sequencing with mRNA sequencing are being explored and built to further improve the diagnostic yield.”
Dr. Richard had no disclosures other than being an employee of GeneDx.
and families of pediatric patients to navigate the landscape.
“Testing options range from targeted variant testing and single-gene testing to exome and genome sequencing,” Gabriele Richard, MD, said at the annual meeting of the Society for Pediatric Dermatology. “It is not always easy to determine which testing is right.”
Increasingly, clinical genomic tests, including exome and genome sequencing, are used for patients with complex phenotypes, and possibly multiple disorders, who might have no diagnosis despite extensive prior testing, said Dr. Richard, medical director at Gaithersburg, Md.–based GeneDx., a molecular diagnostic laboratory that performs comprehensive testing for rare genetic disorders. These tests are also being used more for first-line testing in critically ill patients in the neonatal and pediatric intensive care units, and “have heralded a whole new era of gene and disease discovery,” she added.
Targeted variant testing is used for known familial variants, to test family members for carrier status and segregation, and to make a prenatal diagnosis, she said. Single-gene testing is available for most genes and has its place for conditions that can be clinically well-recognized, such as ichthyosis vulgaris, Darier disease, or Papillon-Lefèvre syndrome.
Specific tests for identifying gene deletions or duplications are exon-level microarrays, multiplex ligation-dependent probe amplification (MLPA), and chromosomal microarray analysis. “The latter has been successful in identifying diseases causing chromosomal abnormalities in over 10% of cases overall,” Dr. Richard said. An example of a skin disorder is X-linked ichthyosis caused by a deletion of the steroid sulfatase locus in more than 95% of affected males, she said.
“However, the current staple of molecular diagnostic testing is multigene next-generation sequencing (NGS) panels, which allow you to interrogate two to hundreds of genes concurrently, including sequencing and deletion duplication testing.” These tests are the most cost effective, she said, and are available for almost any genodermatosis or group of disorders with overlapping phenotypes, such as albinism or ichthyosis, epidermolysis bullosa and skin fragility, ectodermal dysplasia, or porphyria. According to Dr. Richard, the diagnostic outcomes of NGS panels mainly depend on test indication, panel size and gene curation, age of onset, and prevailing inheritance pattern of disorders.
Her recommended criteria for distinguishing the myriad of available NGS panels include checking gene content, technical sensitivity of sequencing and deletion/duplication analysis, quality of variant interpretation and reporting, turn-around time, and available familial follow-up testing. “If a family might consider future prenatal diagnosis, choose the lab that performs prenatal and diagnostic testing,” Dr. Richard said. “Equally important are client services such as ease of ordering, insurance coverage, and the ability to determine out-of-pocket cost to patients.”
Resources that enable consumers to compare panel content, methodology, turnaround time, and other parameters include the Genetic Testing Registry (GTR) operated by the National Center for Biotechnology Information, and Concert Genetics, a genetic testing company. The National Society of Genetic Counselors also offers a searchable database for finding a genetic counselor.
Exome sequencing includes the coding sequences of about 20,000 genes and has an average depth of 50 to about 150 reads. “It is a phenotype-driven test where only select variants are being reported fitting the phenotype,” Dr. Richard said. “The outcome of exome and genome sequencing much depends on optimization of bioinformatic pipelines and tools.” Besides small sequence variants, exome sequencing is able to identify a variety of different types of disease-causing variants, such as gene copy number variants seen in about 6% of positive cases, mosaicism, regions of homozygosity, uniparental disomy, and other unusual events and is cost effective.
Whole-genome sequencing, meanwhile, includes the entire genome, particularly noncoding regions, and has an average depth of more than 30 reads. “It’s based on single-molecule sequencing, has longer reads and more uniform coverage, compared to exome sequencing,” she said. “Higher cost, variant interpretation, and lack of coverage by payers are still presenting challenges for genome sequencing.” Genome sequencing can be done in a day or less.
According to diagnostic outcomes based on 280,000 individuals including 125,000 probands from GeneDx data, a definitive diagnosis was made in 26% of probands, of which 2.8% had more than one diagnostic finding and 1.8% had actionable secondary findings. In addition, 7% of the variants were found in candidate genes; 31% of probands had variants of uncertain significance, while 36% tested negative. “Nevertheless, the diagnostic yield of exome sequencing depends on the phenotype and cohort studied,” Dr. Richard continued.
At her company, she said, the highest positive rate is for multiple congenital anomalies (34%), skeletal system abnormalities (30%), and nervous system abnormalities (29%). Trio testing – the concurrent analysis of both biological parents and proband for all genes – “is a critical factor for success,” she added. “It not only improves the variant calling because we have three times the data and increases test sensitivity, it also provides more certain results, determines inheritance and allows for detection of parental mosaicism.”
According to Dr. Richard, trio testing has a one-third higher diagnostic rate than sequencing of the proband alone. Citing a published prospective study that compiled data from eight different exome- and genome-sequencing studies in critically ill neonates and children, trio testing made it possible to make a genetic diagnosis in up to 58% of children.
Whole-genome sequencing is estimated to have a 5%-10% higher diagnostic rate than exome sequencing. “However, we are still a ways away from using it as a routine diagnostic test for all test indications,” Dr. Richard said. “Automation, special bioinformatics algorithms and databases, and combination of genome sequencing with mRNA sequencing are being explored and built to further improve the diagnostic yield.”
Dr. Richard had no disclosures other than being an employee of GeneDx.
FROM SPD 2021
Targeted therapies for vascular anomalies continue to be refined
“The medicines we had were believed to be antiangiogenic and they were used not only for tumors but for all sorts of malformations,” Dr. Adams, a pediatric hematologist-oncologist at Children’s Hospital of Philadelphia, recalled during the annual meeting of the Society for Pediatric Dermatology. “I didn’t understand how so many different phenotypes could respond to the same medicine. Not all of them did, but some did have some response.”
She also grew frustrated by the lack of clinical trials and collaborative research groups involving patients with vascular anomalies. “I called this the chicken soup of medical management,” she said. “As we got more involved in vascular anomalies, the power of one patient or that power of a few patients led us in a direction for improved medical management. Or knowledge was gained by one patient who failed all noted medical management and led us into a direction repurposing a drug that actually wound up working.”
Propranolol, for example, became a key medicine for the treatment of vascular anomalies when it was found to improve hemangiomas in children who were given the drug for other reasons. “From this observation a key prospective study was performed and this beta-blocker became FDA approved for the treatment of complicated hemangiomas,” said Dr. Adams, who directs the hospital’s Comprehensive Vascular Anomalies Program. “That was how a bedside observation let to bench intervention, and how presently we are investigating bench interventions related to the mechanism of propranolol therapy.”
Then there is the story of the mammalian target of rapamycin (mTOR) inhibitor sirolimus. In her previous role as medical director of the Hemangioma and Vascular Malformation Center at Cincinnati Children’s Hospital, Dr. Adams and colleagues cared for an infant who presented with a Kaposiform hemangioendothelioma (KHE). “At that time, she was given our standard of practice for the treatment, but our standard of practice was not good enough,” she said.
While other options were being discussed for this patient, “we had been doing some collaborative work with pathology and nephrology on the PIKC3A pathway, because we knew that germline mutations of TEK were involved in this pathway, and we knew that 50% of patients with PTEN mutations had vascular anomalies. So, we hypothesized that this pathway was involved in vascular anomalies.”
They also had earlier success using mTOR inhibition for tuberous sclerosis patients with angiomyolipomas and patients with neurofibromatosis. “We needed a medicine that could be given orally because we did not think this patient was going to do well, so we started her on sirolimus,” Dr. Adams said. “She had a great response. This was followed by a phase 2 study, which proved efficacy and led to discovery of biomarkers.” This is where the angiopoietin-2 story started, she said, noting that this biomarker is now used “to differentiate KLA [Kaposiform lymphangiomatosis] from KHE and KLAs and KHE from other disorders.”
This bedside work helped researchers to better understand the mechanism of action in other disorders, such as observing somatic mutations in PIK3CA in patients with CLOVES syndrome. “This meant that we could now correlate the phenotype to the genotype, and it opened up targeted therapy with developmental therapeutics that were already in use for oncology,” Dr. Adams said. “We know we had mTOR inhibition with sirolimus and everolimus. We now have an AKT inhibitor, a PIK3CA inhibitor, and we now have another side of the pathway which deals with RASopathies, and some other medicines that we can use.”
Miransertib, a potent PAN-AKT inhibitor initially used for breast cancer, is currently being evaluated in open-label, phase 1 and 2 trials in patients with PIK3CA-related overgrowth spectrum (PROS) and Proteus syndrome. The dose used in a pilot study is about one-sixth of the dose used for oncology patients, Dr. Adams said.
She and her colleagues used miransertib to treat a 3-year-old with CLOVES syndrome who had lipomatous infiltration of the abdomen and retroperitoneum with failure to thrive. “He was not eating and was G-tube dependent,” she recalled. “After a month of therapy, he started eating and had improvement in his quality of life,” although despite this improvement volumetric MRI remained unchanged.
Advances in bench to bedside approaches are also under way. Hakon Hakonarson, MD, PhD, the founding director of the Center for Applied Genomics at CHOP, has discovered several genes with in vitro testing and zebra fish modeling, which has been followed by testing medicines on patients.
One such patient, according to Dr. Adams, had a severe central conducting lymphatic anomaly, with a pericardial effusion and significant dysfunction of the central conducting system. The patient was found to have an ARAF mutation, which induces ERK activation. “ERK is downstream of MEK, so the question was whether a MEK inhibitor, trametinib, could be used to treat this patient,” she said. “Trametinib was first used in tissue culture, then used in a zebra fish model and it showed some positive results. Then it was taken to the patient, who had improvement of pulmonary function, remodeling of the lymphatic system, and decrease in the size of his legs.”
Other antiangiogenic agents being used for the treatment of vascular anomalies include bevacizumab, which is being used in hereditary hemorrhagic telangiectasia, and thalidomide for HHT and arteriovenous malformations. For more information, Dr. Adams recommended a comprehensive review of vascular anomalies, related genes, and treatments that was published in Circulation Research.
The goal of future drug therapies is to support normal growth, “so we don’t need a maximum tolerated dose,” Dr. Adams said. “We need to be very careful of short-term and long-term side effects.”
Going forward, she said that she would like to see more natural history studies of vascular anomalies, improved outcome measures for clinical trials, adaptive study design, preclinical testing, animal model studies, universal availability of genomic testing, improvement of NIH funding, research collaboration nationally and internationally, and industry support.
Dr. Adams disclosed that she is a consultant to Venthera and Novartis.
“The medicines we had were believed to be antiangiogenic and they were used not only for tumors but for all sorts of malformations,” Dr. Adams, a pediatric hematologist-oncologist at Children’s Hospital of Philadelphia, recalled during the annual meeting of the Society for Pediatric Dermatology. “I didn’t understand how so many different phenotypes could respond to the same medicine. Not all of them did, but some did have some response.”
She also grew frustrated by the lack of clinical trials and collaborative research groups involving patients with vascular anomalies. “I called this the chicken soup of medical management,” she said. “As we got more involved in vascular anomalies, the power of one patient or that power of a few patients led us in a direction for improved medical management. Or knowledge was gained by one patient who failed all noted medical management and led us into a direction repurposing a drug that actually wound up working.”
Propranolol, for example, became a key medicine for the treatment of vascular anomalies when it was found to improve hemangiomas in children who were given the drug for other reasons. “From this observation a key prospective study was performed and this beta-blocker became FDA approved for the treatment of complicated hemangiomas,” said Dr. Adams, who directs the hospital’s Comprehensive Vascular Anomalies Program. “That was how a bedside observation let to bench intervention, and how presently we are investigating bench interventions related to the mechanism of propranolol therapy.”
Then there is the story of the mammalian target of rapamycin (mTOR) inhibitor sirolimus. In her previous role as medical director of the Hemangioma and Vascular Malformation Center at Cincinnati Children’s Hospital, Dr. Adams and colleagues cared for an infant who presented with a Kaposiform hemangioendothelioma (KHE). “At that time, she was given our standard of practice for the treatment, but our standard of practice was not good enough,” she said.
While other options were being discussed for this patient, “we had been doing some collaborative work with pathology and nephrology on the PIKC3A pathway, because we knew that germline mutations of TEK were involved in this pathway, and we knew that 50% of patients with PTEN mutations had vascular anomalies. So, we hypothesized that this pathway was involved in vascular anomalies.”
They also had earlier success using mTOR inhibition for tuberous sclerosis patients with angiomyolipomas and patients with neurofibromatosis. “We needed a medicine that could be given orally because we did not think this patient was going to do well, so we started her on sirolimus,” Dr. Adams said. “She had a great response. This was followed by a phase 2 study, which proved efficacy and led to discovery of biomarkers.” This is where the angiopoietin-2 story started, she said, noting that this biomarker is now used “to differentiate KLA [Kaposiform lymphangiomatosis] from KHE and KLAs and KHE from other disorders.”
This bedside work helped researchers to better understand the mechanism of action in other disorders, such as observing somatic mutations in PIK3CA in patients with CLOVES syndrome. “This meant that we could now correlate the phenotype to the genotype, and it opened up targeted therapy with developmental therapeutics that were already in use for oncology,” Dr. Adams said. “We know we had mTOR inhibition with sirolimus and everolimus. We now have an AKT inhibitor, a PIK3CA inhibitor, and we now have another side of the pathway which deals with RASopathies, and some other medicines that we can use.”
Miransertib, a potent PAN-AKT inhibitor initially used for breast cancer, is currently being evaluated in open-label, phase 1 and 2 trials in patients with PIK3CA-related overgrowth spectrum (PROS) and Proteus syndrome. The dose used in a pilot study is about one-sixth of the dose used for oncology patients, Dr. Adams said.
She and her colleagues used miransertib to treat a 3-year-old with CLOVES syndrome who had lipomatous infiltration of the abdomen and retroperitoneum with failure to thrive. “He was not eating and was G-tube dependent,” she recalled. “After a month of therapy, he started eating and had improvement in his quality of life,” although despite this improvement volumetric MRI remained unchanged.
Advances in bench to bedside approaches are also under way. Hakon Hakonarson, MD, PhD, the founding director of the Center for Applied Genomics at CHOP, has discovered several genes with in vitro testing and zebra fish modeling, which has been followed by testing medicines on patients.
One such patient, according to Dr. Adams, had a severe central conducting lymphatic anomaly, with a pericardial effusion and significant dysfunction of the central conducting system. The patient was found to have an ARAF mutation, which induces ERK activation. “ERK is downstream of MEK, so the question was whether a MEK inhibitor, trametinib, could be used to treat this patient,” she said. “Trametinib was first used in tissue culture, then used in a zebra fish model and it showed some positive results. Then it was taken to the patient, who had improvement of pulmonary function, remodeling of the lymphatic system, and decrease in the size of his legs.”
Other antiangiogenic agents being used for the treatment of vascular anomalies include bevacizumab, which is being used in hereditary hemorrhagic telangiectasia, and thalidomide for HHT and arteriovenous malformations. For more information, Dr. Adams recommended a comprehensive review of vascular anomalies, related genes, and treatments that was published in Circulation Research.
The goal of future drug therapies is to support normal growth, “so we don’t need a maximum tolerated dose,” Dr. Adams said. “We need to be very careful of short-term and long-term side effects.”
Going forward, she said that she would like to see more natural history studies of vascular anomalies, improved outcome measures for clinical trials, adaptive study design, preclinical testing, animal model studies, universal availability of genomic testing, improvement of NIH funding, research collaboration nationally and internationally, and industry support.
Dr. Adams disclosed that she is a consultant to Venthera and Novartis.
“The medicines we had were believed to be antiangiogenic and they were used not only for tumors but for all sorts of malformations,” Dr. Adams, a pediatric hematologist-oncologist at Children’s Hospital of Philadelphia, recalled during the annual meeting of the Society for Pediatric Dermatology. “I didn’t understand how so many different phenotypes could respond to the same medicine. Not all of them did, but some did have some response.”
She also grew frustrated by the lack of clinical trials and collaborative research groups involving patients with vascular anomalies. “I called this the chicken soup of medical management,” she said. “As we got more involved in vascular anomalies, the power of one patient or that power of a few patients led us in a direction for improved medical management. Or knowledge was gained by one patient who failed all noted medical management and led us into a direction repurposing a drug that actually wound up working.”
Propranolol, for example, became a key medicine for the treatment of vascular anomalies when it was found to improve hemangiomas in children who were given the drug for other reasons. “From this observation a key prospective study was performed and this beta-blocker became FDA approved for the treatment of complicated hemangiomas,” said Dr. Adams, who directs the hospital’s Comprehensive Vascular Anomalies Program. “That was how a bedside observation let to bench intervention, and how presently we are investigating bench interventions related to the mechanism of propranolol therapy.”
Then there is the story of the mammalian target of rapamycin (mTOR) inhibitor sirolimus. In her previous role as medical director of the Hemangioma and Vascular Malformation Center at Cincinnati Children’s Hospital, Dr. Adams and colleagues cared for an infant who presented with a Kaposiform hemangioendothelioma (KHE). “At that time, she was given our standard of practice for the treatment, but our standard of practice was not good enough,” she said.
While other options were being discussed for this patient, “we had been doing some collaborative work with pathology and nephrology on the PIKC3A pathway, because we knew that germline mutations of TEK were involved in this pathway, and we knew that 50% of patients with PTEN mutations had vascular anomalies. So, we hypothesized that this pathway was involved in vascular anomalies.”
They also had earlier success using mTOR inhibition for tuberous sclerosis patients with angiomyolipomas and patients with neurofibromatosis. “We needed a medicine that could be given orally because we did not think this patient was going to do well, so we started her on sirolimus,” Dr. Adams said. “She had a great response. This was followed by a phase 2 study, which proved efficacy and led to discovery of biomarkers.” This is where the angiopoietin-2 story started, she said, noting that this biomarker is now used “to differentiate KLA [Kaposiform lymphangiomatosis] from KHE and KLAs and KHE from other disorders.”
This bedside work helped researchers to better understand the mechanism of action in other disorders, such as observing somatic mutations in PIK3CA in patients with CLOVES syndrome. “This meant that we could now correlate the phenotype to the genotype, and it opened up targeted therapy with developmental therapeutics that were already in use for oncology,” Dr. Adams said. “We know we had mTOR inhibition with sirolimus and everolimus. We now have an AKT inhibitor, a PIK3CA inhibitor, and we now have another side of the pathway which deals with RASopathies, and some other medicines that we can use.”
Miransertib, a potent PAN-AKT inhibitor initially used for breast cancer, is currently being evaluated in open-label, phase 1 and 2 trials in patients with PIK3CA-related overgrowth spectrum (PROS) and Proteus syndrome. The dose used in a pilot study is about one-sixth of the dose used for oncology patients, Dr. Adams said.
She and her colleagues used miransertib to treat a 3-year-old with CLOVES syndrome who had lipomatous infiltration of the abdomen and retroperitoneum with failure to thrive. “He was not eating and was G-tube dependent,” she recalled. “After a month of therapy, he started eating and had improvement in his quality of life,” although despite this improvement volumetric MRI remained unchanged.
Advances in bench to bedside approaches are also under way. Hakon Hakonarson, MD, PhD, the founding director of the Center for Applied Genomics at CHOP, has discovered several genes with in vitro testing and zebra fish modeling, which has been followed by testing medicines on patients.
One such patient, according to Dr. Adams, had a severe central conducting lymphatic anomaly, with a pericardial effusion and significant dysfunction of the central conducting system. The patient was found to have an ARAF mutation, which induces ERK activation. “ERK is downstream of MEK, so the question was whether a MEK inhibitor, trametinib, could be used to treat this patient,” she said. “Trametinib was first used in tissue culture, then used in a zebra fish model and it showed some positive results. Then it was taken to the patient, who had improvement of pulmonary function, remodeling of the lymphatic system, and decrease in the size of his legs.”
Other antiangiogenic agents being used for the treatment of vascular anomalies include bevacizumab, which is being used in hereditary hemorrhagic telangiectasia, and thalidomide for HHT and arteriovenous malformations. For more information, Dr. Adams recommended a comprehensive review of vascular anomalies, related genes, and treatments that was published in Circulation Research.
The goal of future drug therapies is to support normal growth, “so we don’t need a maximum tolerated dose,” Dr. Adams said. “We need to be very careful of short-term and long-term side effects.”
Going forward, she said that she would like to see more natural history studies of vascular anomalies, improved outcome measures for clinical trials, adaptive study design, preclinical testing, animal model studies, universal availability of genomic testing, improvement of NIH funding, research collaboration nationally and internationally, and industry support.
Dr. Adams disclosed that she is a consultant to Venthera and Novartis.
FROM SPD 2021
FDA approves first once-weekly growth hormone for children
The U.S. Food and Drug Administration has approved lonapegsomatropin (Skytrofa, Ascendis Pharma), the first weekly subcutaneous injectable growth hormone for children with growth hormone deficiency (GHD).
The approval was based on the findings of the 52-week, phase 3 heiGHt trial in 161 treatment-naive pediatric patients with GHD, which was recently published in the Journal of Clinical Endocrinology & Metabolism.
Since 1987, the standard treatment for pediatric GHD, in which the pituitary gland does not produce enough growth hormone, has been a daily injection of somatropin (recombinant DNA human growth hormone).
“I am excited to be able to reduce the number of shots for some children requiring growth hormone therapy” with this new dosing option, Bradley S. Miller, MD, PhD, who was not involved with the research, said in an email.
“I am hopeful that a once-weekly growth hormone option will improve adherence to growth hormone therapy, leading to improved growth and metabolic outcomes,” added Dr. Miller, professor and division director, pediatric endocrinology, at the University of Minnesota Masonic Children’s Hospital, Minneapolis.
Lonapegsomatropin is approved for the treatment of pediatric patients age 1 year and older who weigh at least 11.5 kg (25.4 pounds) and have short stature due to inadequate secretion of endogenous growth hormone, according to the prescribing information.
The drug molecule consists of a prodrug of somatropin that is inactive when it is bound to a proprietary TransCon (transient conjugation) inert carrier using a TransCon linker. The three-part molecule breaks apart after injection, exposing the active somatropin that is slowly released.
The heiGHt trial demonstrated noninferiority of lonapegsomatropin to somatropin daily injections. Children who received weekly lonapegsomatropin grew 11.2 cm (4.4 inches) per year, whereas those who received an equivalent total dose of somatropin daily injections grew 10.3 cm (4.1 inches) per year.
Safety outcomes – the ratio of bone age to chronologic age, adverse events, tolerability, and immunogenicity – were similar in both groups.
Anticipated uptake, other drugs on horizon
Lonapegsomatropin is expected to be available shortly in the United States along with a suite of patient support programs, according to a company press release.
“The impact of the approval of lonapegsomatropin on clinical practice will depend upon its availability, coverage by insurance providers, and patient/provider comfort with using a new product,” Dr. Miller said.
For most pediatric endocrinologists, daily growth hormone has been available their entire careers, so he expects it will take some time for the pediatric endocrinology community to be comfortable prescribing long-acting growth hormone (LAGH), the name given to the once-weekly products.
In the meantime, an FDA decision on another once-weekly growth hormone, somatrogon (OPKO Health/Pfizer) for children with GHD is expected very soon, in October 2021.
And a weekly injectable somapacitan (Sogroya, Novo Nordisk), approved by the FDA in September last year for adults with GHD, is also being studied in children, with estimated study completion in 2024.
“Approval of more LAGH molecules, approval of LAGH for more indications, real-world evidence of safety, efficacy, and improved adherence, and personal experience with LAGH will all likely lead to increased LAGH use over time,” Dr. Miller speculated.
“Over the long-term, I expect insurance providers will cover LAGH products,” he surmised, “but that the price will be similar to or slightly higher than daily growth hormone.”
However, if improved adherence with LAGH is demonstrated and associated with better treatment outcomes, the price of LAGH will likely increase and use of daily growth hormone will decrease, he predicts.
Paul Saenger, MD, who was not involved with the research, believes “all three long-acting growth hormone drugs will eventually be approved for GHD in children.”
“The price will be the same or may be at most 10% more than daily growth hormone replacement,” Dr. Saenger, a pediatric endocrinologist and clinical assistant professor at NYU Long Island School of Medicine, New York, said in an email.
However, daily subcutaneous injections will still be warranted for certain children with GHD, Dr. Miller noted.
“Daily growth hormone may be better than LAGH for a small number of children who have severe GHD associated with hypoglycemia,” he said. “The low levels of growth hormone at the end of the weekly interval of LAGH may allow hypoglycemia to occur in this population.”
Phase 3 trial in 161 treatment-naive children with GHD
The heiGHt trial randomized treatment-naive prepubertal children with GHD 2:1 to weekly lonapegsomatropin or daily somatropin (Genotropin, Pfizer) at 73 sites in 15 countries.
The children were a mean age of 8.5 years (range, 3.2-13.1 years), 82% were boys, and 94% were White.
There were no reported serious adverse events or discontinuations related to lonapegsomatropin.
The most common adverse reactions in ≥5% of these pediatric patients were viral infection (15%), pyrexia (15%), cough (11%), nausea and vomiting (11%), hemorrhage (7%), diarrhea (6%), abdominal pain (6%), and arthralgia and arthritis (6%).
Both study groups reported low incidences of transient, non-neutralizing anti-hGH binding antibodies and no cases of persistent antibodies.
Trial limitations include the fact the study was not blinded (as patients received a weekly or daily injection) and drug doses were fixed at 0.24 mg human growth hormone/kg/week, although in real-world clinical practice, doses may be titrated.
Lonapegsomatropin has been studied in more than 300 children with GHD in the phase 3 program in the heiGHt trial (treatment-naive patients), fliGHt trial (treatment-experienced patients), and enliGHten trial (an ongoing long-term extension trial that includes some patients who have been taking lonapegsomatropin for more than 4 years).
The study was sponsored by Ascendis Pharma. Some of the phase 3 study authors are company employees.
A version of this article first appeared on Medscape.com.
The U.S. Food and Drug Administration has approved lonapegsomatropin (Skytrofa, Ascendis Pharma), the first weekly subcutaneous injectable growth hormone for children with growth hormone deficiency (GHD).
The approval was based on the findings of the 52-week, phase 3 heiGHt trial in 161 treatment-naive pediatric patients with GHD, which was recently published in the Journal of Clinical Endocrinology & Metabolism.
Since 1987, the standard treatment for pediatric GHD, in which the pituitary gland does not produce enough growth hormone, has been a daily injection of somatropin (recombinant DNA human growth hormone).
“I am excited to be able to reduce the number of shots for some children requiring growth hormone therapy” with this new dosing option, Bradley S. Miller, MD, PhD, who was not involved with the research, said in an email.
“I am hopeful that a once-weekly growth hormone option will improve adherence to growth hormone therapy, leading to improved growth and metabolic outcomes,” added Dr. Miller, professor and division director, pediatric endocrinology, at the University of Minnesota Masonic Children’s Hospital, Minneapolis.
Lonapegsomatropin is approved for the treatment of pediatric patients age 1 year and older who weigh at least 11.5 kg (25.4 pounds) and have short stature due to inadequate secretion of endogenous growth hormone, according to the prescribing information.
The drug molecule consists of a prodrug of somatropin that is inactive when it is bound to a proprietary TransCon (transient conjugation) inert carrier using a TransCon linker. The three-part molecule breaks apart after injection, exposing the active somatropin that is slowly released.
The heiGHt trial demonstrated noninferiority of lonapegsomatropin to somatropin daily injections. Children who received weekly lonapegsomatropin grew 11.2 cm (4.4 inches) per year, whereas those who received an equivalent total dose of somatropin daily injections grew 10.3 cm (4.1 inches) per year.
Safety outcomes – the ratio of bone age to chronologic age, adverse events, tolerability, and immunogenicity – were similar in both groups.
Anticipated uptake, other drugs on horizon
Lonapegsomatropin is expected to be available shortly in the United States along with a suite of patient support programs, according to a company press release.
“The impact of the approval of lonapegsomatropin on clinical practice will depend upon its availability, coverage by insurance providers, and patient/provider comfort with using a new product,” Dr. Miller said.
For most pediatric endocrinologists, daily growth hormone has been available their entire careers, so he expects it will take some time for the pediatric endocrinology community to be comfortable prescribing long-acting growth hormone (LAGH), the name given to the once-weekly products.
In the meantime, an FDA decision on another once-weekly growth hormone, somatrogon (OPKO Health/Pfizer) for children with GHD is expected very soon, in October 2021.
And a weekly injectable somapacitan (Sogroya, Novo Nordisk), approved by the FDA in September last year for adults with GHD, is also being studied in children, with estimated study completion in 2024.
“Approval of more LAGH molecules, approval of LAGH for more indications, real-world evidence of safety, efficacy, and improved adherence, and personal experience with LAGH will all likely lead to increased LAGH use over time,” Dr. Miller speculated.
“Over the long-term, I expect insurance providers will cover LAGH products,” he surmised, “but that the price will be similar to or slightly higher than daily growth hormone.”
However, if improved adherence with LAGH is demonstrated and associated with better treatment outcomes, the price of LAGH will likely increase and use of daily growth hormone will decrease, he predicts.
Paul Saenger, MD, who was not involved with the research, believes “all three long-acting growth hormone drugs will eventually be approved for GHD in children.”
“The price will be the same or may be at most 10% more than daily growth hormone replacement,” Dr. Saenger, a pediatric endocrinologist and clinical assistant professor at NYU Long Island School of Medicine, New York, said in an email.
However, daily subcutaneous injections will still be warranted for certain children with GHD, Dr. Miller noted.
“Daily growth hormone may be better than LAGH for a small number of children who have severe GHD associated with hypoglycemia,” he said. “The low levels of growth hormone at the end of the weekly interval of LAGH may allow hypoglycemia to occur in this population.”
Phase 3 trial in 161 treatment-naive children with GHD
The heiGHt trial randomized treatment-naive prepubertal children with GHD 2:1 to weekly lonapegsomatropin or daily somatropin (Genotropin, Pfizer) at 73 sites in 15 countries.
The children were a mean age of 8.5 years (range, 3.2-13.1 years), 82% were boys, and 94% were White.
There were no reported serious adverse events or discontinuations related to lonapegsomatropin.
The most common adverse reactions in ≥5% of these pediatric patients were viral infection (15%), pyrexia (15%), cough (11%), nausea and vomiting (11%), hemorrhage (7%), diarrhea (6%), abdominal pain (6%), and arthralgia and arthritis (6%).
Both study groups reported low incidences of transient, non-neutralizing anti-hGH binding antibodies and no cases of persistent antibodies.
Trial limitations include the fact the study was not blinded (as patients received a weekly or daily injection) and drug doses were fixed at 0.24 mg human growth hormone/kg/week, although in real-world clinical practice, doses may be titrated.
Lonapegsomatropin has been studied in more than 300 children with GHD in the phase 3 program in the heiGHt trial (treatment-naive patients), fliGHt trial (treatment-experienced patients), and enliGHten trial (an ongoing long-term extension trial that includes some patients who have been taking lonapegsomatropin for more than 4 years).
The study was sponsored by Ascendis Pharma. Some of the phase 3 study authors are company employees.
A version of this article first appeared on Medscape.com.
The U.S. Food and Drug Administration has approved lonapegsomatropin (Skytrofa, Ascendis Pharma), the first weekly subcutaneous injectable growth hormone for children with growth hormone deficiency (GHD).
The approval was based on the findings of the 52-week, phase 3 heiGHt trial in 161 treatment-naive pediatric patients with GHD, which was recently published in the Journal of Clinical Endocrinology & Metabolism.
Since 1987, the standard treatment for pediatric GHD, in which the pituitary gland does not produce enough growth hormone, has been a daily injection of somatropin (recombinant DNA human growth hormone).
“I am excited to be able to reduce the number of shots for some children requiring growth hormone therapy” with this new dosing option, Bradley S. Miller, MD, PhD, who was not involved with the research, said in an email.
“I am hopeful that a once-weekly growth hormone option will improve adherence to growth hormone therapy, leading to improved growth and metabolic outcomes,” added Dr. Miller, professor and division director, pediatric endocrinology, at the University of Minnesota Masonic Children’s Hospital, Minneapolis.
Lonapegsomatropin is approved for the treatment of pediatric patients age 1 year and older who weigh at least 11.5 kg (25.4 pounds) and have short stature due to inadequate secretion of endogenous growth hormone, according to the prescribing information.
The drug molecule consists of a prodrug of somatropin that is inactive when it is bound to a proprietary TransCon (transient conjugation) inert carrier using a TransCon linker. The three-part molecule breaks apart after injection, exposing the active somatropin that is slowly released.
The heiGHt trial demonstrated noninferiority of lonapegsomatropin to somatropin daily injections. Children who received weekly lonapegsomatropin grew 11.2 cm (4.4 inches) per year, whereas those who received an equivalent total dose of somatropin daily injections grew 10.3 cm (4.1 inches) per year.
Safety outcomes – the ratio of bone age to chronologic age, adverse events, tolerability, and immunogenicity – were similar in both groups.
Anticipated uptake, other drugs on horizon
Lonapegsomatropin is expected to be available shortly in the United States along with a suite of patient support programs, according to a company press release.
“The impact of the approval of lonapegsomatropin on clinical practice will depend upon its availability, coverage by insurance providers, and patient/provider comfort with using a new product,” Dr. Miller said.
For most pediatric endocrinologists, daily growth hormone has been available their entire careers, so he expects it will take some time for the pediatric endocrinology community to be comfortable prescribing long-acting growth hormone (LAGH), the name given to the once-weekly products.
In the meantime, an FDA decision on another once-weekly growth hormone, somatrogon (OPKO Health/Pfizer) for children with GHD is expected very soon, in October 2021.
And a weekly injectable somapacitan (Sogroya, Novo Nordisk), approved by the FDA in September last year for adults with GHD, is also being studied in children, with estimated study completion in 2024.
“Approval of more LAGH molecules, approval of LAGH for more indications, real-world evidence of safety, efficacy, and improved adherence, and personal experience with LAGH will all likely lead to increased LAGH use over time,” Dr. Miller speculated.
“Over the long-term, I expect insurance providers will cover LAGH products,” he surmised, “but that the price will be similar to or slightly higher than daily growth hormone.”
However, if improved adherence with LAGH is demonstrated and associated with better treatment outcomes, the price of LAGH will likely increase and use of daily growth hormone will decrease, he predicts.
Paul Saenger, MD, who was not involved with the research, believes “all three long-acting growth hormone drugs will eventually be approved for GHD in children.”
“The price will be the same or may be at most 10% more than daily growth hormone replacement,” Dr. Saenger, a pediatric endocrinologist and clinical assistant professor at NYU Long Island School of Medicine, New York, said in an email.
However, daily subcutaneous injections will still be warranted for certain children with GHD, Dr. Miller noted.
“Daily growth hormone may be better than LAGH for a small number of children who have severe GHD associated with hypoglycemia,” he said. “The low levels of growth hormone at the end of the weekly interval of LAGH may allow hypoglycemia to occur in this population.”
Phase 3 trial in 161 treatment-naive children with GHD
The heiGHt trial randomized treatment-naive prepubertal children with GHD 2:1 to weekly lonapegsomatropin or daily somatropin (Genotropin, Pfizer) at 73 sites in 15 countries.
The children were a mean age of 8.5 years (range, 3.2-13.1 years), 82% were boys, and 94% were White.
There were no reported serious adverse events or discontinuations related to lonapegsomatropin.
The most common adverse reactions in ≥5% of these pediatric patients were viral infection (15%), pyrexia (15%), cough (11%), nausea and vomiting (11%), hemorrhage (7%), diarrhea (6%), abdominal pain (6%), and arthralgia and arthritis (6%).
Both study groups reported low incidences of transient, non-neutralizing anti-hGH binding antibodies and no cases of persistent antibodies.
Trial limitations include the fact the study was not blinded (as patients received a weekly or daily injection) and drug doses were fixed at 0.24 mg human growth hormone/kg/week, although in real-world clinical practice, doses may be titrated.
Lonapegsomatropin has been studied in more than 300 children with GHD in the phase 3 program in the heiGHt trial (treatment-naive patients), fliGHt trial (treatment-experienced patients), and enliGHten trial (an ongoing long-term extension trial that includes some patients who have been taking lonapegsomatropin for more than 4 years).
The study was sponsored by Ascendis Pharma. Some of the phase 3 study authors are company employees.
A version of this article first appeared on Medscape.com.
Study informs about risks of discontinuing meds in JIA
Flares are modest in preliminary data.
Many but not all children with juvenile idiopathic arthritis (JIA) can regain remission after stopping and then restarting treatment, according to preliminary data from the ongoing Recapture-JIA study that were presented in a symposium sponsored by the Rheumatology Research Foundation.
The aim of this study is to evaluate the risks of discontinuing treatment after a period when JIA has been well controlled. Such data are of increasing interest to parents now that many children with JIA are achieving sustained periods of remission, according to Sarah Ringold, MD, a pediatric rheumatologist and associate professor of pediatrics at Seattle Children’s Hospital.
In follow-up so far, “recapture rates range from 50% to 76%” depending on type of JIA, reported Dr. Ringold, who said that patients with systemic JIA have so far been the most likely to achieve a good response when treatment is restarted.
The study is being conducted through the Childhood Arthritis and Rheumatology Research Alliance, which has 71 participating centers and has accrued data on more than 10,000 children with rheumatic diseases. For the study, the researchers identified 384 children with JIA who were already enrolled in the CARRA registry and had discontinued medications and then subsequently restarted them, and they also enrolled a prospective cohort of patients new to the registry who presented with flare after discontinuing their medication. Dr. Ringold reported on 64 of the patients in the prospective cohort.
Median time to flare: 219 days
Of findings so far, disease recurrence after discontinuation has been generally characterized by flares “of moderate activity” several months to more than a year after treatment discontinuation, according to Dr. Ringold, who emphasized repeatedly that these data are preliminary. The median time to a flare after treatment discontinuation was approximately 7 months (219 days).
In the combined cohorts, the median age at onset of JIA was 4 years. The median age at time of discontinuation was 9 years. More than half (55%) were taking a conventional disease-modifying antirheumatic drug (DMARD) and 35% were taking a tumor necrosis factor inhibitor at the time that their therapy was discontinued.
Most JIA types are represented. The most common form is rheumatoid factor–negative oligoarticular JIA. The main outcome looked the rate of clinically inactive disease at 6 months in children who had discontinued therapy after a period of remission. They defined clinically inactive disease as a Physician’s Global Assessment of less than 1 and an active joint count of 0.
Systemic JIA recapture rate at 6 months: 76%
At the time of disease flare after treatment discontinuation across both the retrospective and prospective cohorts, the median clinical Juvenile Arthritis Disease Activity Score based on 10 joints (cJADAS10; score range of 0-30) was 3.5. The recapture rate to clinically inactive disease at 6 months was 76% in those with systemic JIA and 50% in those with rheumatoid factor–positive polyarticular JIA. Other subtypes fell within this range. Rates of inactive disease at 6 months according to cJADAS10 score were lower, ranging from 26% with enthesitis-related arthritis/juvenile psoriatic arthritis to 57% with systemic JIA.
About 40% of those who restarted on therapy after a flare took the same medication again. About one-third of patients were restarted on glucocorticoids, mostly involving injections to inflamed joints, and data are not yet in about whether these were restarted alone or with other drugs, according to Dr. Ringold.
The final analysis of this study will explore clinical and laboratory variables associated with disease recapture. In the prospective cohort, which did not reach its planned enrollment of 150 children because the COVID pandemic, a broad array of these variables was evaluated at baseline.
Numerous studies have already looked at predictors of sustained remission after stopping medications of JIA, according to Dr. Ringold, but she said that there is relatively little information about outcomes in children who stop medications, flare, and are retreated. Other experts agree.
“We know little about how successfully DMARDs can be discontinued and used again after a disease flare,” reported Jens Klotsche, MD, a researcher at the German Rheumatism Research Center, which is part of the Leibniz Institute in Berlin. Dr. Klotsche, who is an author of a recent study that found etanercept effective for retreatment when children with JIA had discontinued therapy, agreed that “data from large cohort studies are necessary to support the treatment decisions by clinicians, parents, and patients.”
JIA recurrence risk is unclear
In a systematic review published 2 years ago, rates of flare following discontinuation of treatment for JIA were relatively high, but there were some limitations to this analysis, according to the lead author, Olha Halyabar, MD, a pediatric rheumatologist at Boston Children’s Hospital.
“The data in our systematic review showed that overall quality of evidence was low, with large variations and sometimes very different conclusions,” Dr. Halyabar said in an interview. She believes that the data generated by the CARRA analysis will be valuable, particularly in evaluating outcomes across subtypes.
“Even though, at this point, [previously published] reports indicate overall high rates of recurrence (>50% for some JIA subtypes), there are some encouraging studies from early treat-to-target strategies,” she said, adding that large datasets like those from CARRA offer an opportunity to gather data likely to be clinically useful.
Dr. Ringold cautioned that there are some limitations to the CARRA analysis, including some missing data from the retrospective cohort. She also pointed out that patients have been assessed at routine clinical visits rather than at standardized intervals, introducing a potential for bias.
For parents concerned about the costs, inconvenience, and side effects from sustained JIA treatment once remission is achieved, data from CARRA will allow clinicians to provide evidence-based counseling on balancing the risks of discontinuing therapy, including the likelihood of regaining remission when disease returns, against the goals of stopping treatment.
“Parents are having more conversations about when to stop medications,” Dr. Ringold said. She indicated that these data should be helpful for providing guidance.
Dr. Ringold, Dr. Klotsche, and Dr. Halyabar reported having no potential conflicts of interest.
Flares are modest in preliminary data.
Flares are modest in preliminary data.
Many but not all children with juvenile idiopathic arthritis (JIA) can regain remission after stopping and then restarting treatment, according to preliminary data from the ongoing Recapture-JIA study that were presented in a symposium sponsored by the Rheumatology Research Foundation.
The aim of this study is to evaluate the risks of discontinuing treatment after a period when JIA has been well controlled. Such data are of increasing interest to parents now that many children with JIA are achieving sustained periods of remission, according to Sarah Ringold, MD, a pediatric rheumatologist and associate professor of pediatrics at Seattle Children’s Hospital.
In follow-up so far, “recapture rates range from 50% to 76%” depending on type of JIA, reported Dr. Ringold, who said that patients with systemic JIA have so far been the most likely to achieve a good response when treatment is restarted.
The study is being conducted through the Childhood Arthritis and Rheumatology Research Alliance, which has 71 participating centers and has accrued data on more than 10,000 children with rheumatic diseases. For the study, the researchers identified 384 children with JIA who were already enrolled in the CARRA registry and had discontinued medications and then subsequently restarted them, and they also enrolled a prospective cohort of patients new to the registry who presented with flare after discontinuing their medication. Dr. Ringold reported on 64 of the patients in the prospective cohort.
Median time to flare: 219 days
Of findings so far, disease recurrence after discontinuation has been generally characterized by flares “of moderate activity” several months to more than a year after treatment discontinuation, according to Dr. Ringold, who emphasized repeatedly that these data are preliminary. The median time to a flare after treatment discontinuation was approximately 7 months (219 days).
In the combined cohorts, the median age at onset of JIA was 4 years. The median age at time of discontinuation was 9 years. More than half (55%) were taking a conventional disease-modifying antirheumatic drug (DMARD) and 35% were taking a tumor necrosis factor inhibitor at the time that their therapy was discontinued.
Most JIA types are represented. The most common form is rheumatoid factor–negative oligoarticular JIA. The main outcome looked the rate of clinically inactive disease at 6 months in children who had discontinued therapy after a period of remission. They defined clinically inactive disease as a Physician’s Global Assessment of less than 1 and an active joint count of 0.
Systemic JIA recapture rate at 6 months: 76%
At the time of disease flare after treatment discontinuation across both the retrospective and prospective cohorts, the median clinical Juvenile Arthritis Disease Activity Score based on 10 joints (cJADAS10; score range of 0-30) was 3.5. The recapture rate to clinically inactive disease at 6 months was 76% in those with systemic JIA and 50% in those with rheumatoid factor–positive polyarticular JIA. Other subtypes fell within this range. Rates of inactive disease at 6 months according to cJADAS10 score were lower, ranging from 26% with enthesitis-related arthritis/juvenile psoriatic arthritis to 57% with systemic JIA.
About 40% of those who restarted on therapy after a flare took the same medication again. About one-third of patients were restarted on glucocorticoids, mostly involving injections to inflamed joints, and data are not yet in about whether these were restarted alone or with other drugs, according to Dr. Ringold.
The final analysis of this study will explore clinical and laboratory variables associated with disease recapture. In the prospective cohort, which did not reach its planned enrollment of 150 children because the COVID pandemic, a broad array of these variables was evaluated at baseline.
Numerous studies have already looked at predictors of sustained remission after stopping medications of JIA, according to Dr. Ringold, but she said that there is relatively little information about outcomes in children who stop medications, flare, and are retreated. Other experts agree.
“We know little about how successfully DMARDs can be discontinued and used again after a disease flare,” reported Jens Klotsche, MD, a researcher at the German Rheumatism Research Center, which is part of the Leibniz Institute in Berlin. Dr. Klotsche, who is an author of a recent study that found etanercept effective for retreatment when children with JIA had discontinued therapy, agreed that “data from large cohort studies are necessary to support the treatment decisions by clinicians, parents, and patients.”
JIA recurrence risk is unclear
In a systematic review published 2 years ago, rates of flare following discontinuation of treatment for JIA were relatively high, but there were some limitations to this analysis, according to the lead author, Olha Halyabar, MD, a pediatric rheumatologist at Boston Children’s Hospital.
“The data in our systematic review showed that overall quality of evidence was low, with large variations and sometimes very different conclusions,” Dr. Halyabar said in an interview. She believes that the data generated by the CARRA analysis will be valuable, particularly in evaluating outcomes across subtypes.
“Even though, at this point, [previously published] reports indicate overall high rates of recurrence (>50% for some JIA subtypes), there are some encouraging studies from early treat-to-target strategies,” she said, adding that large datasets like those from CARRA offer an opportunity to gather data likely to be clinically useful.
Dr. Ringold cautioned that there are some limitations to the CARRA analysis, including some missing data from the retrospective cohort. She also pointed out that patients have been assessed at routine clinical visits rather than at standardized intervals, introducing a potential for bias.
For parents concerned about the costs, inconvenience, and side effects from sustained JIA treatment once remission is achieved, data from CARRA will allow clinicians to provide evidence-based counseling on balancing the risks of discontinuing therapy, including the likelihood of regaining remission when disease returns, against the goals of stopping treatment.
“Parents are having more conversations about when to stop medications,” Dr. Ringold said. She indicated that these data should be helpful for providing guidance.
Dr. Ringold, Dr. Klotsche, and Dr. Halyabar reported having no potential conflicts of interest.
Many but not all children with juvenile idiopathic arthritis (JIA) can regain remission after stopping and then restarting treatment, according to preliminary data from the ongoing Recapture-JIA study that were presented in a symposium sponsored by the Rheumatology Research Foundation.
The aim of this study is to evaluate the risks of discontinuing treatment after a period when JIA has been well controlled. Such data are of increasing interest to parents now that many children with JIA are achieving sustained periods of remission, according to Sarah Ringold, MD, a pediatric rheumatologist and associate professor of pediatrics at Seattle Children’s Hospital.
In follow-up so far, “recapture rates range from 50% to 76%” depending on type of JIA, reported Dr. Ringold, who said that patients with systemic JIA have so far been the most likely to achieve a good response when treatment is restarted.
The study is being conducted through the Childhood Arthritis and Rheumatology Research Alliance, which has 71 participating centers and has accrued data on more than 10,000 children with rheumatic diseases. For the study, the researchers identified 384 children with JIA who were already enrolled in the CARRA registry and had discontinued medications and then subsequently restarted them, and they also enrolled a prospective cohort of patients new to the registry who presented with flare after discontinuing their medication. Dr. Ringold reported on 64 of the patients in the prospective cohort.
Median time to flare: 219 days
Of findings so far, disease recurrence after discontinuation has been generally characterized by flares “of moderate activity” several months to more than a year after treatment discontinuation, according to Dr. Ringold, who emphasized repeatedly that these data are preliminary. The median time to a flare after treatment discontinuation was approximately 7 months (219 days).
In the combined cohorts, the median age at onset of JIA was 4 years. The median age at time of discontinuation was 9 years. More than half (55%) were taking a conventional disease-modifying antirheumatic drug (DMARD) and 35% were taking a tumor necrosis factor inhibitor at the time that their therapy was discontinued.
Most JIA types are represented. The most common form is rheumatoid factor–negative oligoarticular JIA. The main outcome looked the rate of clinically inactive disease at 6 months in children who had discontinued therapy after a period of remission. They defined clinically inactive disease as a Physician’s Global Assessment of less than 1 and an active joint count of 0.
Systemic JIA recapture rate at 6 months: 76%
At the time of disease flare after treatment discontinuation across both the retrospective and prospective cohorts, the median clinical Juvenile Arthritis Disease Activity Score based on 10 joints (cJADAS10; score range of 0-30) was 3.5. The recapture rate to clinically inactive disease at 6 months was 76% in those with systemic JIA and 50% in those with rheumatoid factor–positive polyarticular JIA. Other subtypes fell within this range. Rates of inactive disease at 6 months according to cJADAS10 score were lower, ranging from 26% with enthesitis-related arthritis/juvenile psoriatic arthritis to 57% with systemic JIA.
About 40% of those who restarted on therapy after a flare took the same medication again. About one-third of patients were restarted on glucocorticoids, mostly involving injections to inflamed joints, and data are not yet in about whether these were restarted alone or with other drugs, according to Dr. Ringold.
The final analysis of this study will explore clinical and laboratory variables associated with disease recapture. In the prospective cohort, which did not reach its planned enrollment of 150 children because the COVID pandemic, a broad array of these variables was evaluated at baseline.
Numerous studies have already looked at predictors of sustained remission after stopping medications of JIA, according to Dr. Ringold, but she said that there is relatively little information about outcomes in children who stop medications, flare, and are retreated. Other experts agree.
“We know little about how successfully DMARDs can be discontinued and used again after a disease flare,” reported Jens Klotsche, MD, a researcher at the German Rheumatism Research Center, which is part of the Leibniz Institute in Berlin. Dr. Klotsche, who is an author of a recent study that found etanercept effective for retreatment when children with JIA had discontinued therapy, agreed that “data from large cohort studies are necessary to support the treatment decisions by clinicians, parents, and patients.”
JIA recurrence risk is unclear
In a systematic review published 2 years ago, rates of flare following discontinuation of treatment for JIA were relatively high, but there were some limitations to this analysis, according to the lead author, Olha Halyabar, MD, a pediatric rheumatologist at Boston Children’s Hospital.
“The data in our systematic review showed that overall quality of evidence was low, with large variations and sometimes very different conclusions,” Dr. Halyabar said in an interview. She believes that the data generated by the CARRA analysis will be valuable, particularly in evaluating outcomes across subtypes.
“Even though, at this point, [previously published] reports indicate overall high rates of recurrence (>50% for some JIA subtypes), there are some encouraging studies from early treat-to-target strategies,” she said, adding that large datasets like those from CARRA offer an opportunity to gather data likely to be clinically useful.
Dr. Ringold cautioned that there are some limitations to the CARRA analysis, including some missing data from the retrospective cohort. She also pointed out that patients have been assessed at routine clinical visits rather than at standardized intervals, introducing a potential for bias.
For parents concerned about the costs, inconvenience, and side effects from sustained JIA treatment once remission is achieved, data from CARRA will allow clinicians to provide evidence-based counseling on balancing the risks of discontinuing therapy, including the likelihood of regaining remission when disease returns, against the goals of stopping treatment.
“Parents are having more conversations about when to stop medications,” Dr. Ringold said. She indicated that these data should be helpful for providing guidance.
Dr. Ringold, Dr. Klotsche, and Dr. Halyabar reported having no potential conflicts of interest.
FROM RHEUMATOLOGY RESEARCH FOUNDATION SUMMER SERIES