The sample size in this study yielded power to identify significant association between T2D and variants in the KCNQ1, CDKN2A/2B, CDKAL1, HHEX, MTNR1B, TCF7L2, and UBE2E2 genes ranging from 2.13 to 37.41%. This evidence concerns the gene TCF7L2 and type 2 diabetes mellitus.