For female, fasting glucagon levels (13.33 vs.11.52, P < 0.01) and insulin (12.20 vs.17.40, P < 0.05) levels were higher in the T2DM&CAD group, while fasting blood glucose levels (6.65 vs.7.8, P < 0.001) were lower in the T2DM&CAD group. This evidence concerns the gene GCG and type 2 diabetes mellitus.