TCF7L2 and type 2 diabetes mellitus: Meta-analysis of rs7903146 in the TCF7L2 gene with T2D in four cohorts of Han Chinese populations composed of 3,203 cases and 3,109 controls also supported that rs7903146 in the TCF7L2 was significantly associated with T2D in the Han Chinese population (trend p = 6.2 × 10-4) with OR of 1.37.