GCG and type 2 diabetes mellitus: Findings from recently published cohort studies were consistent with our results, such as the possible adverse impact of add-on DPP-4i treatment on DR (50), non-significant associations between GLP-1 RA and DR (51), as well as the potential association between combination therapy of SGLT-2i with metformin and the reduced risk of DR in individuals with type 2 diabetes (52).