We further tested the distribution of the KIR AA vs. Bx genotypes (x represents haplotype A or B) in patients and controls; the frequency of KIR AA showed no significant difference between the healthy controls and the MDS patients (55.30% vs. 51.95%, P = 0.573; Table 1 and Figure 1). The gene discussed is KIR3DL1; the disease is myelodysplastic syndrome.