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Isatuximab is a monoclonal antibody targeting the transmembrane receptor and extracellular enzyme CD38 in malignant cells of the hematological system and is a highly expressed protein in multiple myeloma. Isatuximab has antitumor activity, antibody-dependent cytotoxicity, complement-dependent cytotoxicity, and antibody-dependent cytophagocytosis, which can directly induce apoptosis in the absence of crosslinking. Isatuximab has an inhibitory effect on CD38 extracellular enzyme activity, which is associated with many cellular functions.