Carcinogenesis Advance Access published online on June 15, 2006
Carcinogenesis, doi:10.1093/carcin/bgl108
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1 Graduate Institute of Medical Sciences, National Defense Medical Center, Taipei, Taiwan
* To whom correspondence should be addressed. Methylenetetrahydrofolate reductase (MTHFR) balances the pool of folate coenzymes in one-carbon metabolism for DNA synthesis and methylation, both are implicated in carcinogenesis. Two common variants in the MTHFR gene (C677T and A1298C) have been associated with reduced enzyme activity, thereby making MTHFR polymorphisms a potential candidate cancer-predisposing factor.To evaluate the C677T and A1298C functional polymorphisms in the MTHFR gene and their associations with breast cancer risk, as well as the potential modifying effect by plasma folate status on the MTHFR-associated risk, a hospital-based case-control study was conducted on a Taiwanese population consisting of 146 histologically confirmed incident breast cancer cases and their 285 age-matched controls without a history of cancer. A PCR-RFLP method was used for MTHFR polymorphism genotyping and RIA was used to measure the plasma folate. Statistical evaluations were performed using logistic regression analysis. The plasma folate level was inversely associated with breast cancer risk with an adjusted odds ratio (OR) of 0.52 (95% confidence interval [CI]: 0.26-1.05) observed among women who were in the highest plasma folate tertile. The MTHFR 677T and 1298C variant alleles were associated with decreased risk for breast cancer (adjusted ORs were 0.81 [95% CI: 0.54-1.21] and 0.57 [95% CI: 0.36-0.89] for 677CT+TT genotypes and 1298AC+CC genotypes, respectively). Furthermore, compound heterozygote and homozygote variants (677CT+TT and 1298AC+CC) had greater reduced risk (adjusted OR: 0.11, 95% CI: 0.03-0.43) among women with lower plasma folate levels. These results provide support for the important role of folate metabolism in breast tumorigenesis. Further mechanistic studies are warranted to investigate how MTHFR combined genotypes exert their effect on cancer susceptibility.
Received January 24, 2006
Revised May 10, 2006
Accepted May 27, 2006
MOLECULAR EPIDEMIOLOGY AND CANCER PREVENTION
Genetic polymorphisms of the methylenetetrahydrofolate reductase gene, plasma folate levels, and breast cancer susceptibility: a case-control study in Taiwan
Yu-Ching Chou 1,
Mei-Hsuan Wu 2,
Jyh-Cherng Yu 3,
Meei-Shyuan Lee 2,
Tsan Yang 4,
Hsiu-Lan Shih 2,
Tsai-Yi Wu 2,
and
Chien-An Sun 2 *
2 School of Public Health, National Defense Medical Center, Taipei, Taiwan
3 Department of Surgery, Tri-Service General Hospital, Taipei, Taiwan
4 Graduate Institute of Health Care, Meiho Institute of Technology, Pingtung, Taiwan, Republic of China
Chien-An Sun, E-mail: sunca{at}mail.ndmctsgh.edu.tw
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