HematologyPfizer

Pfizer Reports Positive Phase 3 BASIS Trial Results for Marstacimab in Hemophilia

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Biotechnology Media Insights

Editorial Team · April 18, 2025

Pfizer announces positive Phase 3 BASIS trial results showing marstacimab significantly reduces bleeding rates in patients with hemophilia A or B without inhibitors.

Hematology blood research laboratory with test tubes and analysis equipment

Pfizer today announced positive results from the Phase 3 BASIS trial evaluating marstacimab, an anti-TFPI antibody, in patients with severe hemophilia A or B without inhibitors. The trial met its primary endpoint, demonstrating a significant reduction in treated bleeding rate compared to prior prophylaxis.

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