KIR2DS2: HLA-C1 match: higher aGVHD2−4 (AML);  KIR2DS1: HLA-C2 match: higher cGVHD (AML);  Donor presenting KIR2DL1 or 2DS2: higher cGVHD (AML). This evidence concerns the gene KIR2DL1 and acute myeloid leukemia.