GCG and type 2 diabetes mellitus: As the weight loss observed in response to treatment with GLP-1 RAs may be, at least in part, due to their effect on gastric emptying, the impact of GLP1R rs6923761 polymorphism on both parameters was investigated in obese T2DM patients from two trials treated with liraglutide for 16 weeks or with exenatide for 30 days, respectively.