Asian Pacific Journal of Cancer Prevention

Asian Pacific Journal of Cancer Prevention (아시아태평양암예방학회)
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Polymorphisms in the Thymidylate Synthase Gene and Risk of Colorectal Cancer

  • Gao, Chang-Ming (Department of Epidemiology, Jiangsu Province Institute of Cancer Research) ;
  • Ding, Jian-Hua (Department of Epidemiology, Jiangsu Province Institute of Cancer Research) ;
  • Li, Su-Ping (Department of Epidemiology, Jiangsu Province Institute of Cancer Research) ;
  • Liu, Yan-Ting (Department of Epidemiology, Jiangsu Province Institute of Cancer Research) ;
  • Cao, Hai-Xia (Department of Epidemiology, Jiangsu Province Institute of Cancer Research) ;
  • Wu, Jian-Zhong (Department of Epidemiology, Jiangsu Province Institute of Cancer Research) ;
  • Tajima, Kazuo (Division of Epidemiology and Prevention, Aich Cancer Center Research Institute)
  • Published : 2012.08.31
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Abstract

To evaluate the relationship between polymorphisms (28 bp repeated sequences in 5'-UTR and 6-bp ins/del in 3'-UTR) in then thymidylate synthetase gene (TS) and risk of colorectal, colon and rectal cancers, we conducted a case-control study with 315 cases of colorectal cancer and 439 population-based controls in Jiangsu province, China. TS genotypes were identified using PCR.RFLP (restriction fragment length polymorphism) methods. Odds ratios (ORs) were estimated with an unconditional logistic regression model. We found that the distributions of 5'-UTR genotypes in TS were significantly different between controls and male colon cases (${\chi}^2$=8.25, P = 0.016). Compared with 3R/3R genotype, individuals with the 2R allele were at an increased risk of colon cancer (age-, BMI-, smoking- and alcohol drinking-adjusted OR=1.98, 95%CI: 1.11-3.53) among men. In ccontrast, the 6-bp ins/del polymorphism at the TS 3'- UTR did not influence risk of the colorectal, colon and rectal cancers. When combined genotypes for both TS 5'-UTR and 3'-UTR polymorphisms were evaluated, individuals with the 5'-UTR 2R allele had a OR of 3.61 (95%CI: 1.38-9.49) for colon cancer among men with the 3'-UTR .6bp/-6bp genotype. These results show that the polymorphism of the 28 bp repeated sequences in TS 5'-UTR could influence susceptibility to colon cancer and that there was a coordinated effect between TS 3'-UTR and 5'-UTR polymorphisms in increasing risk of colon cancer among Chinese men.

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References

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