TCF7L2 and type 2 diabetes mellitus: Few that have been reported include: (i) a T2DM case-control study on Saudi Arabian population that validated only some (WFS1, JAZF1, SLC30A8, CDKN2A/B, TCF7L2, KCNQ1, HMG20A, HNF4A and DUSP9) of the T2DM genes implicated in European population3; however, the study was not adjusted for population stratification.