Abstract
The association between methylenetetrahydrofolate reductase (MTHFR) gene polymorphisms and breast cancer risk has been extensively explored, but their results are conflicting rather than conclusive. To derive a more precise estimation, we carried out not only an updated meta-analysis but also a combined analysis based on all the available studies estimating the association between MTHFR C677T and/or A1298C and breast cancer risk. With respect to C677T polymorphism, the results suggested that 677T allele was associated with significantly elevated breast cancer risk in overall analysis (T vs. C: OR 1.073, 95 % CI 1.028–1.120; TT vs. CC: OR 1.177, 95 % CI 1.072–1.293; TT vs. CC + CT: OR 1.175, 95 % CI 1.073–1.288); Stratifying by ethnicity, significantly increased risk was only found in East Asians (T vs. C: OR 1.150, 95 % CI 1.039–1.273; TT vs. CC: OR 1.441, 95 % CI 1.145–1.814; TT vs. CC + CT: OR 1.413, 95 % CI 1.148–1.739); When stratified by menopausal status, statistically significant association was found for postmenopausal women (CT + TT vs. CC: OR 1.092, 95 % CI 1.011–1.179). In regard to A1298C polymorphism, no significant associations were found between the polymorphism and breast cancer risk. With respect to MTHFR haplotypes, significantly elevated breast cancer risk was associated with 677T-1298C for overall result (OR 1.498, 95 % CI 1.143–1.962) and for Caucasians (OR 2.088, 95 % CI 1.277–3.416) when compared with 677C-1298A; Haplotype 677C-1298C might provide higher protection than 677C-1298A in East Asians (OR 0.840, 95 % CI 0.742–0.949). The combined genotypes for C677T and A1298C produced a significant OR for the 677TT/1298AC relative to 677CC/1298AA in overall population (OR 2.047, 95 % CI 1.275–3.288); When stratified by ethnicity, significant ORs were only found for East Asians (677CC/1298CC vs. 677CC/1298AA: OR 0.686, 95 % CI 0.478–0.985; 677TT/1298AC vs. 677CC/1298AA: OR 2.181, 95 % CI 1.179–4.035). The findings suggest that the MTHFR C677T polymorphism but not A1298C, and some variants on their combined genotypes or haplotypes may be involved with the development of breast cancer.
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References
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This study was supported by the National Natural Science Foundation of China (81272470).
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Shanliang Zhong and Zhiyuan Chen have Contributed equally to this article.
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Zhong, S., Chen, Z., Yu, X. et al. A meta-analysis of genotypes and haplotypes of methylenetetrahydrofolate reductase gene polymorphisms in breast cancer. Mol Biol Rep 41, 5775–5785 (2014). https://doi.org/10.1007/s11033-014-3450-9
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DOI: https://doi.org/10.1007/s11033-014-3450-9