[Purpose] To investigate the possible interaction between COX-2 765 polymorphism and environmental risk factors in the pathogenesis of esophageal squamous cell carcinoma.[Methods] According to the case-control design,202 cases with esophagal cancer and 236 controls were enrolled in this study. COX-2 765 single nucleotide polymorphism was detected with Taqman probe, and multiplicative model was used to analyze interaction between COX-2 765 genotype and environmental factors. [Results] Allele frequency of C o...