Folate-Related Nutrients, Genetic Polymorphisms, and Colorectal Cancer Risk: the Fukuoka Colorectal Cancer Study

Morita, Makiko; Yin, Guang; Yoshimitsu, Shin-Ichiro; Ohnaka, Keizo; Toyomura, Kengo; Kono, Suminori; Ueki, Takashi; Tanaka, Masao; Kakeji, Yoshihiro; Maehara, Yoshihiko; Okamura, Takeshi; Ikejiri, Koji; Futami, Kitaroh; Maekawa, Takafumi; Yasunami, Yohichi; Takenaka, Kenji; Ichimiya, Hitoshi; Terasaka, Reiji

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자료유형: 학술저널

저자정보: Morita, Makiko (Department of Preventive Medicine, Graduate School of Medical Sciences, Kyushu University) Yin, Guang (Department of Preventive Medicine, Graduate School of Medical Sciences, Kyushu University) Yoshimitsu, Shin-Ichiro (Department of Preventive Medicine, Graduate School of Medical Sciences, Kyushu University) Ohnaka, Keizo (Department of Geriatric Medicine, Graduate School of Medical Sciences, Kyushu University) Toyomura, Kengo (Department of Preventive Medicine, Graduate School of Medical Sciences, Kyushu University) Kono, Suminori (Department of Preventive Medicine, Graduate School of Medical Sciences, Kyushu University) Ueki, Takashi (Department of Surgery and Oncology, Graduate School of Medical Sciences, Kyushu University) Tanaka, Masao (Department of Surgery and Oncology, Graduate School of Medical Sciences, Kyushu University) Kakeji, Yoshihiro (Department of Surgery and Science, Graduate School of Medical Sciences, Kyushu University) Maehara, Yoshihiko (Department of Surgery and Science, Graduate School of Medical Sciences, Kyushu University) Okamura, Takeshi (Department of Gastroenterological Surgery, National Kyushu Cancer Center) Ikejiri, Koji (Divi) Futami, Kitaroh Maekawa, Takafumi Yasunami, Yohichi Takenaka, Kenji Ichimiya, Hitoshi Terasaka, Reiji

저널정보: 아시아태평양암예방학회 Asian Pacific journal of cancer prevention : APJCP Asian Pacific journal of cancer prevention : APJCP 제14권 제11호

발행연도: 2013.1

수록면: 6,249 - 6,256 (8page)

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One-carbon metabolism plays an important role in colorectal carcinogenesis. Meta-analyses have suggested protective associations of folate and vitamin $B_6$ intakes with colorectal cancer primarily based on studies in Caucasians, and genetic polymorphisms pertaining to the folate metabolism have been a matter of interest. Less investigated are the roles of methionine synthase (MTR) and thymidylate synthetase (TS) polymorphisms in colorectal carcinogenesis. In a study of 816 cases and 815 community controls in Japan, we investigated associations of dietary intakes of folate, methionine, vitamin $B_2$, vitamin $B_6$, and vitamin $B_{12}$ with colorectal cancer risk. The associations with MTR 2756A>G, MTRR 66A>G, and TSER repeat polymorphism were examined in 685 cases and 778 controls. Methionine and vitamin $B_{12}$ intakes were inversely associated with colorectal cancer risk, but the associations were totally confounded by dietary calcium and n-3 fatty acids. The other nutrients showed no association with the risk even without adjustment for calcium and n-3 fatty acids. The TSER 2R allele was dose-dependently associated with an increased risk. The MTR and MTRR polymorphisms were unrelated to colorectal cancer risk. There was no measurable gene-gene or gene-nutrient interaction, but increased risk associated with the TSER 2R allele seemed to be confined to individuals with high folate status. This study does not support protective associations for folate and vitamin $B_6$. The TSER 2R allele may confer an increased risk of colorectal cancer. The role of the TSER polymorphism in colorectal carcinogenesis may differ by ethnicity.

#Colorectal cancer #methionine synthase #thymidylate synthase #B-vitamins #case-control study

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