Use, access, and initial outcomes of off-label ivosidenib in patients with IDH1 mutant glioma.
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2024-04
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Abstract
Background
Isocitrate dehydrogenase (IDH) is commonly mutated (mIDH) in gliomas, and this mutant enzyme produces the oncometabolite 2-hydroxyglutarate (2HG). 2HG promotes gliomagenesis and is implicated in epileptogenesis. Ivosidenib (IVO), a small molecule oral mIDH1 inhibitor, is FDA-approved for mIDH1 newly diagnosed and relapsed/refractory acute myeloid leukemia. Moreover, IVO has efficacy in clinical trials for recurrent mIDH1 gliomas. Given the lack of targeted treatments for gliomas, we initiated off-label IVO for mIDH glioma patients in October 2020.Methods
Retrospectively, we sought to assess early outcomes in our patients and describe their experience on IVO from October 2020 through February 2022. Our objective was to report on the following variables of off-label use of IVO: radiographic response, seizure control, tolerability, and access to the medication. All patients initially received single-agent IVO dosed at 500 mg orally once daily.Results
The cohort age range was 21-74 years. Tumor types included astrocytoma (n = 14) and oligodendroglioma (n = 16), with most being grade 2 (n = 21). The best radiographic response in nonenhancing disease (n = 22) was 12 stable diseases, 5 minor responses, 3 partial responses, and 2 progressive diseases. Seizure frequency was stable to improved for most patients (70%, n = 21). IVO was well-tolerated, with the most common toxicities being diarrhea, elevated creatine kinase, and QTc interval prolongation. Most patients (66.7%, n = 20) received drugs via the patient assistance program, with insurance initially covering a third of patients and with ongoing use, later covering 60%.Conclusions
Targeted therapies like IVO are options for mIDH glioma patients and can provide positive oncologic and neurological outcomes.Type
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Peters, Katherine B, Candice Alford, Amy Heltemes, Alicia Savelli, Daniel B Landi, Gloria Broadwater, Annick Desjardins, Margaret O Johnson, et al. (2024). Use, access, and initial outcomes of off-label ivosidenib in patients with IDH1 mutant glioma. Neuro-oncology practice, 11(2). pp. 199–204. 10.1093/nop/npad068 Retrieved from https://hdl.handle.net/10161/34372.
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Scholars@Duke
Katherine Barnett Peters
Katy Peters, MD, PhD, FAAN is a professor of neurology and neurosurgery at the Preston Robert Tisch Brain Tumor Center (PRTBTC) at Duke. Her academic medical career started at Stanford University School of Medicine, receiving an MD and Ph.D. in Cancer Biology. After completing a neurology residency at Johns Hopkins University and a fellowship in cognitive neurosciences, Katy joined the PRTBTC as a neuro-oncology fellow. In 2009, she became a faculty member at PRTBTC. With a fantastic team of nursing and advanced practice providers, she actively sees and cares for patients with primary brain tumors. Her research interests include supportive care for brain cancer patients, cognitive dysfunction in cancer patients, and physical function and activity of brain cancer patients. While she runs clinical trials to treat primary brain tumors, her key interest is on clinical trials that focus on improving brain tumor patients' quality of life and cognition. In 2019, the PRTBTC designated her as the Director of Supportive Care, thus furthering the PRTBTC and her committee to better the quality of life for brain tumor patients. She is active in teaching medical school students, residents, fellows, and advanced practice providers and is the Program Director of the PRTBRC neuro-oncology fellowship. She is board certified by the American Board of Psychiatry and Neurology and the United Council of Neurologic Subspecialties for neuro-oncology.
Daniel Bryce Landi
Annick Desjardins
Margaret Johnson
I am a neuro-oncologist, neurologist, and palliative care physician at the Preston Robert Tisch Brain Tumor Center. I also provide neuro-oncology expertise for the National Tele-Oncology Program and National Precision Oncology Program at the Veteran's Health Administration. My clinical and research interests encompass supportive care and palliative care with a special interest in older adults with brain tumors. The incidence of malignant brain tumors like glioblastoma and non-malignant tumors like meningioma affect aging populations and it is crucial to be able to provide better care for these patients.
Mustafa Khasraw
I am a physician-scientist with a background in medical oncology and neuro-oncology, with affiliations to multiple departments, research, and training programs at Duke.
I lead a Tumor Immunology Lab where we use various wet and dry lab techniques to understand the interactions between tumors and the immune system. Our goal is to identify vulnerabilities that can be targeted for novel therapies.
I serve as the Deputy Director of the Center for Cancer Immunotherapy at the Duke Cancer Institute where we are tasked to facilitate clinical research and translate promising discoveries made by scientists across various departments and cancer types at Duke, particularly in the field of immune and T cell-based therapies.
My team and our laboratory operate in an environment that enables the transition from bench-side basic scientific discoveries to clinical trials, and back to the bench ensuring the evaluation of new treatments for cancer patients.
Henry Seth Friedman
Overview: Our laboratory is pursuing a comprehensive analysis of the biology and therapy of adult and childhood central nervous system malignancies, particularly high-grade medulloblastoma, glioma, and ependymoma.
Laboratory Studies: Active programs, using human adult and pediatric CNS tumor continuous cell lines, transplantable xenografts growing subcutaneously and intracranially in athymic nude mice and rats, and as well as in the subarachnoid space of the athymic nude rats, and patients tumor specimens, are defining:
1) the chemotherapeutic profile of medulloblastoma, adult and childhood glioma and ependymoma
2) mechanisms of resistance to classical bifunctional alkylators, nitrosoureas and methylators operational in malignant glioma and medulloblastoma, particularly DNA adduct and crosslink repair, O6-alkylguanine-DNA alkyltransferase elevation and DNA mismatch repair deficiency.
3) modulations designed to over come or circumvent specific mechanisms of resistance
4) the activity of signal pathway inhibitors of EGFR, m-tor and other targets
5) the therapeutic advantages of intrathecal and intratumoral drug delivery in the treatment of neoplastic meningitis and intracranial malignancies, respectively.
The results of the therapeutic studies to date have demonstrated the marked activity of alkylating agents, particularly melphalan and cyclophosphamide and the role of glutathione, AGT glutathione-S-transferase, abnormal drug transport and alterations in formation and repair of DNA-DNA crosslinks in modulating cytotoxicity of these agents. Modulations shown to be effective in enhancing alkylator activity/reversing alkylator resistance include BSO-mediated glutathione depletion, inhibition of DNA-DNA crosslink repair and inhibition of 06-alkylguanine-DNA alkyltransferase by 06-benzylguanine. Recent studies have demonstrated profound activity of temozolomide, CPT-11 topotecan, irofulven, and karenitecin as well as the combination of CPT-11 or topotecan plus BCNU or temozolomide. Successful treatment of neoplastic meningitis in nude rats with intrathecal 4-hydroperoxycyclophosphamide, melphalan, temozolomide and busulfan, and intracranial glioma in nude rats with intratumoral temozolomide has also been demonstrated. More recent studies have revealed cyclophosphamide resistance secondary to DNA interstrand crosslink repair. Additional studies have shown that cyclophosphamide crosslinks are formed at the 1,3 N7 position, serving as the basis for construction of a defined crosslink in a plasmid vector to assay for crosslink repair and allowing demonstration of the lack of a role of nucleotide excision repair. Mismatch repair deficiency has been shown as a mechanism mediating acquired methylator (procarbazine and temozolomide) resistance in an adult glioblastoma xenograft.
Clinical Studies: Clinical investigations are designed to translate laboratory programs into successful treatment for adults and children with malignant brain tumors, particularly medulloblastoma. Clinical trials for adults include phase II trials of temozolomide, ZD1839 (Iressa), karenitecin, and temozolomide plus O6-BG as well as phase I trials of topotecan plus BCNU, CPT-11 plus temozolomide, and PTK787 ± temozolomide or CCNU. Studies are in progress in children evaluating the activity CPT-11 plus temozolomide, intrathecal busulfan and cyclophosphamide/melphalan or cyclophosphamide/busulfan plus autologous bone marrow support . Extension of these studies to a larger cohort of patients is being performed nationally under the auspices of the Pediatric Brain Tumor Consortium (Henry S. Friedman -- Head of New Agents Committee).
Future studies will address the role of agents designed to decrease repair of interstrand crosslinks when given in combination with alkylating agents, as well as newer signal pathway inhibitors such as RAD001, PKI166, and DB-67.
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