Morais, Stephanie L.Gonçalves, Tiago F.C.Delerue-Matos, CristinaFerrreira-Fernandes, HygorPinto, Giovanny R.Domingues, Valentina F.Barroso, M. Fátima2023-01-272022-09http://hdl.handle.net/10400.22/21938The cytochrome P450 (CYP) enzymes constitute a large polymorphic family that play a huge role in the metabolism of endogenous compounds and in the metabolization of 70–80% of all clinically prescribed medications. Among them, the CYP2C9, CYP2C19, CYP2D6 and CYP4F2 genes are of clinical relevance, as they are highly polymorphic and implicated in the metabolism of several drugs. These genetic polymorphisms which induce variability in CYPs expression present qualitative and quantitative differences between ethnic groups and geographic regions. This review aims to evaluate the allele frequencies, genotypic distribution and predicted CYP2C9, CYP2C19, CYP2D6 and CYP4F2 genetic variants in the European countries. Therefore, a PubMed and a Web of Science search from 1989 to 2021 on the data on the polymorphic prevalence among European countries of the CYP2C9, CYP2C19, CYP2D6 and CYP4F2 genes was performed. After excluding the duplicates, a total of 1179 studies were found. The results were structured and presented in accordance with the Preferred Reporting Items for Systematic Reviews and Meta-Analyses (PRISMA) guidelines. The present paper is an overview on the frequency CYP genetic variations, facilitating the prediction of a patient's response to medication and, consequently, enabling the selection of personalized medicineengCYP2C9CYP2C19CYP2D6CYP4F2European populationsGenetic polymorphismjournal article10.1016/j.humgen.2022.201027