P1410: EFFICACY OBSERVATION OF A SECOND INFUSION OF BCMA-CAR-T CELLS IN PATIENTS WITH REFRACTORY/RELAPSED MULTIPLE MYELOMA - Yi Wang; Ben Niu; Limin Hou; Ding Zhang; Qiuying Gao; Hui Wang; Ying Gao; Yudi Miao; Xinhui Zhai; Ying Guo; Weihua Zhang; Xingli Ru; et al. (HemaSphere, 2023)