KIR3DL1 and leukemia: In the context of haploidentical HSCT, where KIR‐HLA class I mismatch in graft versus host direction has been associated to NK‐mediated graft versus leukemia effect,14, 40, 63, 64 the frequencies of 2DL1+ alloreactive NK cells might be precisely monitored by multicolour flow cytometry, combining HP‐DM1 with the other iKIR‐specific mAbs.