Selection of hematopoietic stem cell donor based on KIR alleles may improve efficiency of allogeneic NK-cell-based immunotherapy nevertheless, subtyping for KIR2DL1 alleles (KIR2DL1∗001-004) in ALL having HLA-C2 revealed no significant difference [20]. Here, KIR2DL1 is linked to acute lymphoblastic leukemia.