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• Methylenetetrahydrofolate reductase polymorphisms and breast cancer risk: a meta-analysis from 41 studies with 16,480 cases and 22,388 controls.

  Qi X, Ma X, Yang X, Fan L, Zhang Y, Zhang F, Chen L, Zhou Y, Jiang J. Qi X, et al. Breast Cancer Res Treat. 2010 Sep;123(2):499-506. doi: 10.1007/s10549-010-0773-7. Epub 2010 Feb 5. Breast Cancer Res Treat. 2010. PMID: 20135343
• MTHFR C677T polymorphism associated with breast cancer susceptibility: a meta-analysis involving 15,260 cases and 20,411 controls.

  Zhang J, Qiu LX, Wang ZH, Wu XH, Liu XJ, Wang BY, Hu XC. Zhang J, et al. Breast Cancer Res Treat. 2010 Sep;123(2):549-55. doi: 10.1007/s10549-010-0783-5. Epub 2010 Feb 9. Breast Cancer Res Treat. 2010. PMID: 20143151