PPARG and diabetes mellitus: Recent studies reported that PPARG gene was correlated with higher risk to diabetes [8] and the G allele of the rs1801282 C>G polymorphism in PPARG gene was associated with T2DM rsk in a genome-wide association study (GWAS) [9] and has been replicated in some case-control studies; however, other studes found no association between this polymorphism and T2DM [10–12].