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The Common 677C>T Gene Polymorphism of Methylenetetrahydrofolate Reductase Gene is not Associated with Breast Cancer Risk

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Abstract

Methylenetetrahydrofolate reductase (MTHFR) is involved in folate metabolism and plays a role in DNA biosynthesis, methylation, and repair in actively dividing cells. A common 677C>T polymorphism in the gene for MTHFR, leading to a thermolabile enzyme with decreased activity, has been associated with reduced plasma folate levels and elevated homocysteine levels and could be a risk factor for breast cancer. In the present case-control study, MTHFR genotype was determined in 500 women with clinically verified breast cancer and 500 female age-matched healthy control subjects. The homozygous TT genotype was found in 13.0% patients and 13.1% controls (P = n.s.). The odds ratio of TT homozygotes for breast cancer was 0.99 (95% confidence interval 0.68–1.43). The MTHFR genotype was furthermore not associated with tumor size, histological grading, estrogen or progesterone receptor status and age at diagnosis. In a subgroup of 116 premenopausal patients, no increased frequency of the homozygous 677T genotype was found (13.8%). Therefore, we conclude that the MTHFR 677C>T polymorphism is not associated with individual susceptibility to breast cancer.

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Langsenlehner, U., Krippl, P., Renner, W. et al. The Common 677C>T Gene Polymorphism of Methylenetetrahydrofolate Reductase Gene is not Associated with Breast Cancer Risk. Breast Cancer Res Treat 81, 169–172 (2003). https://doi.org/10.1023/A:1025752420309

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