From a general perspective, one may notice that the complex tumor karyotype was associated only with the C2 AML group (C1/C2 and C2/C2 genotypes) and mainly with a KIR AA genotype, while the normal tumor karyotype, seen in both C1 and C2 groups, was generally associated with a KIR Bx genotype. This evidence concerns the gene KIR3DL1 and acute myeloid leukemia.