TCF7L2 and type 2 diabetes mellitus: Rs7903146 in TCF7L2, rs12779790 near CDC123/CAMK1D, rs1111875 near HHEX, and rs7501939 in TCF2 showed nominal associations with the risk for lean T2D (ORs 1.12–1.28, P values 1.52 × 10−2 to 3.34 × 10−2).