Expanded g-NK cells have markedly enhanced persistence when combined with daratumumab in vivo. When mice were euthanized, we compared the number of g-NK and cNK cells in the blood (A), spleen (B), and bone marrow (C) of NSG mice treated with daratumumab (n = 7 for g-NK and cNK arms; n = 8 for vehicle arm). To compare persistence of g-NK and cNK cells in a murine model of MM (with daratumumab), an independent samples Student t test was performed when the mice were euthanized. Values are mean ± SEM. ***P < .001.