GGT7 and type 2 diabetes mellitus: Haplotype analysis revealed that the rs1801310G–rs6088660C–rs13041792A haplotype of GSS increased the risk of type 2 diabetes, whereas, on the contrary, two haplotypes such as rs6119534T–rs11546155G and rs6119534C–rs11546155A of GGT7 decreased disease risk.