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CYP2C19 but not CYP2B6, CYP3A4, CYP3A5, ABCB1, PON1 or P2Y12 genetic polymorphism impacts antiplatelet response after clopidogrel in Koreans.
Blood Coagulation & Fibrinolysis : An International Journal in Haemostasis and Thrombosis 2017 January
Clopidogrel response variability (CRV) is well documented, and may affect clinical outcomes. Impact of genetic polymorphisms is important for assessing and predicting CRV. The extensive evidence indicates the importance of CYP2C19 variants in reducing efficacy of clopidogrel. This study defined the impact of numerous genetic polymorphisms on CRV before and after percutaneous coronary interventions (PCI) exclusively in a Korean cohort assuming less genetic variability noise. One hundred and thirty-six patients of Korean origin undergoing PCI were included. Platelet reactivity was measured by VerifyNow assay before and after PCI. Genetic polymorphism of seven single nucleotides of CYP2B6, CYP2C19, CYP3A4, CYP3A5, ABCB1, PON1, and P2Y12 were evaluated and matched with platelet reactivity. Carriers of at least one CYP2C19*2 or *3 allele uniformly exhibited higher platelet reactivity compared to 0-carrier pre-PCI (odds ratio 3.1, 95% confidence interval 1.4-6.9, P < 0.01) and post-PCI (odds ratio 3.4, 95% confidence interval 1.7-6.8, P < 0.001). The carriers of other gene allele variants lack uniformed impact on CRV. The Korean carriers of CYP2C19*2 or *3 allele are linked to CRV, whereas CYP2B6, CYP3A4, CYP3A5, ABCB1, PON1, and P2Y12 failed to predict CRV. The exact clinical utility of these findings is uncertain, and requires a large randomized national trial for proof of concept.
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