FDA OKs Pfizer Multiple Myeloma Drug

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FDA has granted Pfizer accelerated approval for Elrexfio (elranatamab-bcmm), a bispecific B-cell maturation antigen (BCMA)-directed CD3 T-cell engager for treating adults with relapsed or refractory multiple myeloma who have received at least four prior lines of therapy, including a proteasome inhibitor, an immunomodulatory agent, and an anti-CD38 monoclonal antibody.

Approval was based on data from the MagnetisMM-3 (NCT04649359) study that evaluated the therapy’s objective response rate (ORR) and duration of response (DOR), according to an FDA release. “The primary efficacy population consisted of 97 patients naïve to prior BCMA-directed therapy and who had previously received at least 4 prior lines of therapy, including a proteasome inhibitor, an immunomodulatory agent, and an anti-CD38 monoclonal antibody,” it says. “The ORR in the 97 patients receiving the recommended dose was 57.7% (95% CI: 47.3%, 67.7%). With a median follow-up of 11.1 months among responders, the median DOR was not reached (95% CI: 12 months, not reached). The DOR rate at 6 months was 90.4% (95% CI: 78.4%, 95.9%) and at 9 months was 82.3% (95% CI: 67.1%, 90.9%).”

The approval also required a Boxed Warning for life threatening or fatal cytokine release syndrome (CRS) and neurologic toxicity, including immune effector cell-associated neurotoxicity (ICANS). “Among patients who received elranatamab-bcmm at the recommended dose, CRS occurred in 58% of patients, neurologic toxicity in 59%, and ICANS in 3.3%,” the agency says. “Grade 3 CRS occurred in 0.5% of patients and Grade 3 or 4 neurologic toxicity occurred in 7%.”

Additionally, the agency says it is requiring a Risk Evaluation and Mitigation Strategy restriction due to the risks of CRS and neurologic toxicity, including ICANS.

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