The purpose of this study was to determine the relationship between polymorphisms in Claudin-1 (CLDN1) and the risk of colorectal cancer in a Chinese population. In this study, a case-control study was conducted in which polymorphisms in CLDN1 were analyzed in 50 patients with colorectal cancer (CRC) and 50 healthy individuals as controls. No rs16865344 and rs17429833 polymorphism were found among all analyzed samples. For the rs17501976 polymorphism, the TC genotype (OR = 0. 41, 95% CI = 0.18-0.91, and P = 0.045) was closely associated with the risk of colorectal cancer compared with the more common TT genotype. And the TC + CC genotypes (OR = 0.41, 95% CI = 0.18-0.91, and P = 0.045) were also significantly associated with the risk of CRC compared with the TT genotype. However, a C > T change of the rs17501976 polymorphism did not show a difference in transcription factor binding to the promoter region of CLDN1. For rs12696600 polymorphism, no significant difference was found in colorectal cancer risk between cases and controls in corresponding genotypes. Collectively, our data suggest that rs17501976 polymorphism significantly associated with a decreased susceptibility to CRC in a Chinese population.
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