P847: MRD BY MASS SPECTROMETRY IN PERIPHERAL BLOOD AND NEXT GENERATION SEQUENCING IN BONE MARROW IN A PHASE 2 STUDY OF DARATUMUMAB, CARFILZOMIB, LENALIDOMIDE, AND DEXAMETHASONE FOR... oleh B. Derman, J. Rosenblatt, D. Avigan, A. Major, M. Rampurwala, D. Barnidge, A. Stefka, K. Jiang, A. Jakubowiak