IMPACT OF <i>CYP2C19 </i>GENE POLYMORPHISMS ON CLINICAL OUTCOMES IN PATIENTS WITH MYOCARDIAL INFARCTION DURING 12-MONTH FOLLOW-UP
Aim. To evaluate the impact of CYP2C19 gene *1, *2, *3, *17 alleles polymorphism on 12-month clinical outcomes in patients who underwent coronary revascularization due to acute myocardial infarction and took clopidogrel. Methods. 363 patients with acute myocardial infarction undergoing percutaneous coronary intervention were enrolled in the prospectively study in 2010-2012. CYP2C19 gene *1, *2, *3, *17 alleles polymorphism analysis was performed in all study participants. Dual antiplatelet therapy, consisting of aspirin and clopidogrel, was prescribed for 12 months. The follow-up period was 12 months, the incidence of cardiovascular death, non-fatal myocardial infarction, stroke and bleeding was assessed. Results. 12 months after inclusion in the study, the incidence of composite endpoint (defined as cardiovascular death, non-fatal myocardial infarction and stroke) was observed in 18 patients (7% [5%; 11%]; 95% CI) with wild-type CYP2C19 geneand in 12 patients (11% [6%; 18%]; 95% CI) with lost-of-function *2+*3 alleles,with no statistical difference (OR = 1.6 [0.7; 3.6], 95% CI; p = 0.301). Presence of any LOF-alleles did not predict composite endpoint events (OR = 1.56 [0.71; 3.34], 95% CI, p<0.253). Multivariable logistic regression analysis revealed that CYP2C19*2 homozygotes have higher risk of composite endpoint (OR = 6.34, 95% CI [1.57; 22.23], p<0.005) and myocardial infarction (OR = 5.45, 95% CI [1.14; 19.97], p<0.016) compared to *2 heterozygotes and wild-type carriers. 14 patients had major bleedings, required blood transfusion or hospitalization. Patient's age, increase in creatinine level and gain-of-function (GOF) CYP2C19*17 homozygotic carriage were identified as the predictors of major bleeding during follow-up period. Conclusion. In this study CYP2C19 LOF alleles polymorphism except the CYP2C19*2 homozygotic carriage demonstrated no impact on the incidence of ischemic events during 12-month follow-up in patients with acute MI who underwent successful revascularization. CYP2C19*17 homozygotes demonstrated increased risk of major bleeding only in young individuals with elevated blood creatinine levels.