Current antidiabetic drugs to treat T2DM include incretin mimetic, biguanides, sulfonylureas, thiazolidinediones, dipeptidyl peptidase 4 inhibitors, sodium-glucose co-transporter 2 inhibitors, glucagon-like peptide 1 agonists, and α-glucosidase inhibitors [5,6]. This evidence concerns the gene GCG and type 2 diabetes mellitus.