The frequency of activating KIR genes in standard-risk group was higher when compared to the high-risk group, specifically for KIR2DS1, KIR2DS2 and KIR3DS1. A secondary analysis of this study, comparing standard-risk group vs high-risk group in AML patients, revealed higher frequencies of activating KIR genes in the standard-risk group, particularly for KIR2DS1, KIR2DS2, and KIR2DS3 genes, the latter one in agreement with our findings in AML patients group [22]. Here, KIR3DL1 is linked to acute myeloid leukemia.