In our previous study, the decreased frequencies of KIR AA genotype were found in three subtypes of leukemia when compared to healthy controls: acute lymphoblastic leukemia (ALL, OR = 0.68, 95%CI = 0.52‐0.89, P = 0.004), AML (OR = 0.76, 95%CI = 0.59‐0.98, P = 0.034), and chronic myeloid leukemia (CML, OR = 0.72, 95%CI = 0.51‐1.01, ns). This evidence concerns the gene KIR3DL1 and acute lymphoblastic leukemia.