Two meta-analyses revealed that there was no significant difference occurring with the use of DPP-4 inhibitors before hospital admission regarding the risk of developing a severe or fatal disease course in COVID-19 patients (risk ratio: 1.15; 95% CI: 0.64–2.06, risk ratio: 0.81; 95% CI: 0.57–1.15) [32, 33]. The gene discussed is DPP4; the disease is COVID-19.