Objective: To investigate the relationship between CYP2 C19 gene polymorphism and clinical efficacy of clopidogrel in patients with coronary artery disease( CAD) in Xinjiang. Methods: A total of 168 CAD patients receiving CYP2 C19 gene polymorphism detection were enrolled including 99 patients after PCI and 69 patients with multivessel disease diagnosed by selective coronary angiography( SCA) that were not suitable for PCI and didn't receive coronary artery bypass grafting( CABG). According to the different...