We also observed the similar trend for non-Hodgkin's lymphoma (NHL, OR = 0.47, 95%CI = 0.26‐0.88, P = 0.017), which implied that the KIR AA genotype could confer differential protection against ALL, AML, CML, and NHL in Chinese Southern Han [8]. This evidence concerns the gene KIR3DL1 and non-Hodgkin lymphoma.