P870: EFFICACY AND SAFETY OF ELRANATAMAB IN PATIENTS WITH RELAPSED/REFRACTORY MULTIPLE MYELOMA AND PRIOR B-CELL MATURATION ANTIGEN (BCMA)-DIRECTED THERAPIES: A POOLED ANALYSIS FROM MAGNETISMM STUDIES - Salomon Manier; Alexander Lesokhin; Mohamad Mohty; Ruben Niesvizky; Christopher Maisel; Bertrand Arnulf; Sarah M. Larson; Asya Nina Varshavsky-Yanovsky; Xavier Leleu; Lionel Karlin; David H. Vesole; Nizar J Bahlis; et al. (HemaSphere, 2023)