A statistically significant increase in specific killing was observed when KP1237 was used in combination with CIML NK cells in an ADCC assay against CD38 expressing MOLP-8 (p = 0.0105, mean 61.8 ± SD 9.1 and mean 83.7 ± SD 13.58 for CIML NK alone and CIML NK+KP1237, respectively).