P903: DARATUMUMAB PLUS BORTEZOMIB AND DEXAMETHASONE IN NEWLY DIAGNOSED PATIENTS WITH MAYO 2004 STAGE 3 LIGHT-CHAIN AMYLOIDOSIS: A PROSPECTIVE PHASE 2 STUDY - Y.-J. Gao; K.-N. Shen; L. Chang; J. Feng; L. Zhang; Y.-Y. Mao; X.-X. Cao; D.-B. Zhou; J. Li (HemaSphere, 2022)