Carcinogenesis Advance Access originally published online on July 28, 2005
Carcinogenesis 2005 26(12):2164-2171; doi:10.1093/carcin/bgi196
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Carcinogenesis Vol.26 No.12 © Oxford University Press 2005; all rights reserved.
One-carbon metabolism related gene polymorphisms interact with alcohol drinking to influence the risk of colorectal cancer in Japan
1 Division of Epidemiology and Prevention, 2 Department of Gastroenterological Surgery, 3 Department of Clinical Laboratory, Aichi Cancer Center, Chikusa-ku, Nagoya 464-8681, Japan and 4 Department of Internal Medicine and Molecular Science, Nagoya City University Graduate School of Medical Science, Nagoya Aichi, Nagoya 467-8601, Japan
* To whom correspondence should be addressed. Fax: +81 52 763 5233; Email: kmatsuo{at}aichi-cc.jp
One-carbon metabolism, in which folate plays an essential role, is involved in DNA methylation and synthesis, and is suspected of impacting on colorectal carcinogenesis. Alcohol is well recognized as a risk factor for colorectal cancer (CRC) and interactions with one-carbon metabolism have also been suggested. Therefore, functional polymorphisms in genes encoding members of this pathway, MTHFR C677T and A1298C (genes for methylenetetrahydrofolate reductase), MTR A2756G (gene for methionine synthase) and TS (gene for thymidylate synthase) tandem repeats polymorphisms, have attracted attention. We conducted a matched case–control study with 257 incident CRC cases and 771 non-cancer controls at the Aichi Cancer Center to clarify associations among folate intake and four polymorphisms with reference to CRC risk. Gene–environment interaction between polymorphisms, drinking and folate consumption was also evaluated. None of the polymorphisms showed any significant impact on CRC risk by genotype alone, but when combined with alcohol consumption the MTHFR 677CC type showed a significantly reduced risk (odds ratio (OR) = 0.45, 95% confidence interval (CI): 0.23–0.86) (P = 0.01). MTR GG showed increased risk only among drinkers (OR = 3.35, 1.40–8.05) (P = 0.047). TS polymorphism did not show statistical significance by genotype alone, while interaction with drinking was significant (P = 0.028). The association was not changed even after stratification by daily folate consumption and drinking habit. In conclusion, we found consistently significant interactions between one-carbon metabolism-related polymorphisms and alcohol drinking.
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