KCNQ1 and type 2 diabetes mellitus: As T2DM is a multigenic heredity disease, KCNQ1 rs2237892 C→T gene polymorphism might be associated with the gene linkage disequilibrium of KCNQ1 rs2237895 A→C, rs2237897 C→T and rs2074196 G→T gene polymorphisms, which might increase the T2DM risk 7.