Genotyping of six clopidogrel-metabolizing enzyme polymorphisms has a minor role in the assessment of platelet reactivity in patients with acute coronary syndrome

Abstract

Objective:To evaluate the contribution of six polymorphisms to the platelet reactivity in patients with acute coronary syndrome (ACS) treated with clopidogrel.Methods:Cross-sectional study of 278 consecutive patients with ACS. Detailed clinical information for each patient was collected and genotypes (CYP2C9*2, CYP2C9*3, CYP2C19*2, CYP2C19*17, CYP3A4*1B, and PON1-Q192R) were evaluated with TaqMan® and KASPar® assays. Platelet reactivity was measured with VerifyNow®.Results:Mean age of patients was 66±11 years and 182 (65.5%) patients presented ACS without ST-segment elevation. A total of 206 (74.1%) patients presented poor response to clopidogrel (PRC). CYP2C19*2 polymorphism (p=0.038) was associated with PRC in the univariate setting. In the multiple logistic regression analysis, the risk factors for PRC were the presence of CYP3A4*1B allele (odds ratio [OR] 4.03; 95% confidence interval [CI] 1.01–16.34), age (OR 1.43; 95% CI 1.03–2.00), and body mass index (OR 4.05; 95% CI 1.21–13.43), whereas elevated hemoglobin was a protective factor. Discrimination of PRC through the model that included the six polymorphisms added modest information to the model based on clinical variables (C statistic difference 3.9%).Conclusion:CYP3A4*1B allele may be an independent determinant of PRC in patients with ACS, although the variability in response to clopidogrel explained by the six polymorphisms is poor when compared to clinical variables. (Anatol J Cardiol 2017; 17: 303-12)

Pharmacogenetics of Antithrombotic Drugs: Status Update on the Problem

“…В настоящее время описаны 22 генетических полиморфизма, большинство из которых не имеет принципиального клинического значения в активности фермента. Для клопидогрела наиболее изучены аллельные варианты 3А4*1В, 3А4*1G, 3А4*3C, 3А4*18 и 3А4*22 [43][44][45]. Однако данные работы отличались немногочисленностью выборки и большой вариабельностью полученных результатов, в связи с чем не имеют большого клинического значения.…”

Estudio de las variantes alélicas CYP2C9*2 y CYP2C9*3 en muestras de población mestiza peruana

“…En los caucásicos se ha reportado que los genotipos CYP2C9*1/*2 , CYP2C9*1/*3 12 , 13 y CYP2C9*2/*2 son responsables de los efectos secundarios de la fenitoína 12 - 14 ; en los individuos indios, el CYP2C9*3/*3 12 , 15 , en japoneses, los genotipos CYP2C9*1/*3 y CYP2C19*1/*3 12 , y en los afroamericanos están implicados los genotipos CYP2C9*6/*6 y CYP2C19*1/*1 12 . Además, el CYP2C9 metaboliza el clopidogrel 16 , 17 , la S-warfarina 11 , la fluvastatina 6 , la glibenclamida, el losartán, el irbesartán, el ibuprofeno, el lornoxicam y el diclofenaco 18 .…”