Our study results are consistent with those on several ethnicities in the world, which demonstrated a significant relationship between rs12255372 and rs7903146 polymorphisms of the TCF7L2 gene and T2DM in French [14], Dutch [15], British [16], Germany [17], Polish [18], American [18,19], Japanese [20], and in other ethnicities [9,21,22,23]. Here, TCF7L2 is linked to type 2 diabetes mellitus.