Several polymorphisms have been described in the DPP4 gene (located in region 2q24.3), some of which have been associated with rheumatoid arthritis (Jiang et al., 2014), T2DM, (Ahmed et al., 2016) and myocardial infarction in patients with coronary artery disease (CAD) (Aghili et al., 2012). The gene discussed is DPP4; the disease is type 2 diabetes mellitus.