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Objective: To investigate the association of lung cancer susceptibility with genetic Polymorphism of CYP1A1 and GSTM1. Methods: The study was conducted on 65 lung cancer cases and 60 no-cancer controls. The genetic polymorphism both CYP1A1 and GSTM1 were performed in cancer tissues of all patients and peripheral blood leukocytes of no-cancer controls. First by RFLP-PCR, then after incubating with restriction enzyme Ncol and Hinfl. Results: ①There were no significant differences in the frequency distribution of CYP1A1 polymorphisms between lung cancer patients and controls, but the frequency of CYP1A1(Val/Val) was significant higher than that controls (P