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To explore the correlation between the C807T polymorphism of platelet membrane gly- coprotein Ⅰa (GPⅠa) gene and aspirin resistance in Chinese people, 200 patients with high-risk of atherosclerosis took aspirin (100 mg/d) for 7 days. Platelet aggregation function was detected using adenosine diphosphate (ADP) and arachidonic acid (AA) before and after the administration of aspi- fin. Then the subjects were divided into three groups according to the results of platelet aggregation function: an aspirin resistant (AR) group, an aspirin semi-responder (ASR) group and an aspi- fin-sensitive (AS) group. Platelet GPⅠa gene 807CT polymorphism was examined by means of po- lymerase chain reaction-sequence specific primers (PCR-SSP). The results showed that T allelic fre- quency in AR group and ASR group were higher that of AS group (P