Pfizer's Elrexfio Meets Phase III Primary Endpoint in Multiple Myeloma, Positioning Drug for Earlier-Line Use on April 30, 2026 Antibodies, Bispecific earlier-line treatment elranatamab Elrexfio MagnetisMM-5 Multiple Myeloma Pfizer Phase III Progression-Free Survival refractory myeloma Relapsing course +