Question · Q4 2025
Umer Raffat asked about the importance of the eGFR endpoint for Felzartamab beyond the primary endpoint, especially given challenges in evaluating it in Phase 2, and the rationale for limiting development to kidney transplant AMR rather than other organ transplants.
Answer
Priya Singhal, Head of Development at Biogen, stated that while the primary endpoint is the focus, the eGFR endpoint is very important, and the totality of data will be considered. She reiterated excitement based on the Phase 2 proof of concept, which showed a compelling >80% magnitude of effect despite being a small trial. She confirmed that Biogen is evaluating the potential for addressing CD38 autoantibodies in other transplants and will provide updates as relevant. She also mentioned initiating a sister indication trial for microvascular inflammation. Christopher A. Viehbacher, President and CEO, added that they are monitoring physicians who are independently experimenting with CD38 in other transplants, such as heart, to gain insights.
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