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Background High on-treatment platelet reactivity (HTPR) is associated with a worse prognosis after percutaneous coronary intervention.The mechanisms underlying HTPR are not fully understood.Cytochrome P450 2C19 (CYP2C19) plays an important role in clopidogrel biotransformation to its active form,because of the high frequency of CYP2C 19 G681A polymorphism in Asian population.We aimed to elucidate the preliminary association of cytochrom P450 2C19 G681A polymorphism with HTPR.