To facilitate identification of studies assessing the effect of socioeconomic status on utilisation of incretin-based therapies, we searched PubMed in January 2023 adapting a previously used search strategy [16], using the following search terms: (("socioeconomic factors" or "social class" or "socioeconomic" or "social" or "income" or "education*" or "depriv*") AND ("glucagon-like peptide 1" or "glp1*" or "glp-1*" or "glucagon-like-peptide-1" OR "dpp4" or "dpp-4" or "dipeptidyl peptidase 4" or "dipeptidyl peptidase-4" or “incretin”)) AND (type 2 diabetes). The gene discussed is DPP4; the disease is type 2 diabetes mellitus.