Elranatamab in relapsed or refractory multiple myeloma: the MagnetisMM-1 phase 1 trial.
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2023-10
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Abstract
Multiple myeloma (MM) is a plasma cell malignancy expressing B cell maturation antigen (BCMA). Elranatamab, a bispecific antibody, engages BCMA on MM and CD3 on T cells. The MagnetisMM-1 trial evaluated its safety, pharmacokinetics and efficacy. Primary endpoints, including the incidence of dose-limiting toxicities as well as objective response rate (ORR) and duration of response (DOR), were met. Secondary efficacy endpoints included progression-free survival (PFS) and overall survival (OS). Eighty-eight patients with relapsed or refractory MM received elranatamab monotherapy, and 55 patients received elranatamab at efficacious doses. Patients had received a median of five prior regimens; 90.9% were triple-class refractory, 29.1% had high cytogenetic risk and 23.6% received prior BCMA-directed therapy. No dose-limiting toxicities were observed during dose escalation. Adverse events included cytopenias and cytokine release syndrome. Exposure was dose proportional. With a median follow-up of 12.0 months, the ORR was 63.6% and 38.2% of patients achieving complete response or better. For responders, the median DOR was 17.1 months. All 13 patients evaluable for minimal residual disease achieved negativity. Even after prior BCMA-directed therapy, 53.8% achieved response. For all 55 patients, median PFS was 11.8 months, and median OS was 21.2 months. Elranatamab achieved durable responses, manageable safety and promising survival for patients with MM. ClinicalTrials.gov Identifier: NCT03269136 .
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Bahlis, Nizar J, Caitlin L Costello, Noopur S Raje, Moshe Y Levy, Bhagirathbhai Dholaria, Melhem Solh, Michael H Tomasson, Michael A Damore, et al. (2023). Elranatamab in relapsed or refractory multiple myeloma: the MagnetisMM-1 phase 1 trial. Nature medicine, 29(10). pp. 2570–2576. 10.1038/s41591-023-02589-w Retrieved from https://hdl.handle.net/10161/30450.
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Cristina Gasparetto
Dr. Gasparetto performs both laboratory and clinical research in the field of multiple myeloma. Her primary research interests are in developing immunotherapy approaches to treating multiple myeloma particularly in conjunction with hematopoietic stem cell transplantation. Ongoing laboratory research projects include the development of dendritic cell vaccines and antibody therapies. Clinical studies include a recently approved trial involving vaccination with autologous dendritic cells pulsed with idiotypic protein following high dose chemotherapy and autologous peripheral blood stem cells transplant. Upcoming trials include novel antibody therapies for multiple myeloma. Dr. Gasparetto is also an investigator on several other clinical trials for myeloma including non-myeloablative allogeneic transplantation, high dose sequential chemotherapy and autologous peripheral blood stem cell transplantation and transplantation of partially HLA matched unrelated cord blood.
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