4 reported that the C allele of KCNQ1 rs2237892 C→T gene polymorphism conferred a risk of T2DM in the Korean population. Similarly, Liu et al. 5 confirmed the effects of KCNQ1 rs2237892 C variants in a Chinese population. By contrast, Chen et al. 6 did not find any difference in the prevalence of T2DM between the three genotypes of KCNQ1 rs2237892 gene locus in another Chinese population. Here, KCNQ1 is linked to type 2 diabetes mellitus.