title: Association between dietary intake of folate and MTHFR and MTR genotype with risk of breast cancer.
abstract: We investigated the association between dietary intake of folate, vitamin B6, and the 5,10-methylenetetrahydrofolate reductase (MTHFR) genotype with breast cancer. A matched case-control study was conducted, and 413 patients with newly diagnosed and histologically confirmed breast cancer and 436 controls were recruited. Folate intake, vitamin B6, and vitamin B12 levels were calculated, and the MTHFR C677T and A1298C and MTR A2756G polymorphisms were analyzed by polymerase chain reaction-restriction fragment length polymorphism. Breast cancer cases were generally older, older at first live birth, and younger at menarche, had a higher body mass index, were smokers, had higher energy intake, and more first-degree relatives with breast cancer as well as more live births compared to controls. With respect to energy intake, we found that higher energy intake were more likely to increase the risk of breast cancer. The MTHFR 667TT genotype was associated with a moderately increased risk of breast cancer when compared with the CC genotype, and a significant odds ratio (OR; 95% confidence interval, CI) was found (OR = 1.70, 95%CI = 1.06-2.73). Individuals carrying T allele were associated with higher risk of breast cancer when compared with C allele (OR = 1.34, 95%CI = 1.06-1.70). We did not find a significant effect of the MTHFR A1298C and MTR A2756G on the risk of breast cancer. We did not find any association between folate intake and MTHFR C677T polymorphisms. In conclusion, we found that the MTHFR C667T polymorphism is associated with the risk of breast cancer, indicating that this genotype plays a role in breast cancer development.
authors.affiliation: Department of General Surgery, Hospital of the Chinese People's Liberation Army, Beijing, China wcg_xmc@163.com.
authors.forename: J M
authors.initials: JM
authors.lastname: He
authors.affiliation: Department of General Surgery, Hospital of the Chinese People's Liberation Army, Beijing, China.
authors.forename: Y D
authors.initials: YD
authors.lastname: Pu
authors.affiliation: Department of General Surgery, Hospital of the Chinese People's Liberation Army, Beijing, China.
authors.forename: Y J
authors.initials: YJ
authors.lastname: Wu
authors.affiliation: Department of General Surgery, Hospital of the Chinese People's Liberation Army, Beijing, China.
authors.forename: R
authors.initials: R
authors.lastname: Qin
authors.affiliation: Department of General Surgery, Hospital of the Chinese People's Liberation Army, Beijing, China.
authors.forename: Q J
authors.initials: QJ
authors.lastname: Zhang
authors.affiliation: Department of General Surgery, Hospital of the Chinese People's Liberation Army, Beijing, China.
authors.forename: Y S
authors.initials: YS
authors.lastname: Sun
authors.affiliation: General Surgery Department, Xinxiang Medical College, Weihui, China.
authors.forename: W W
authors.initials: WW
authors.lastname: Zheng
authors.affiliation: General Surgery Department, Xinxiang Medical College, Weihui, China.
authors.forename: L P
authors.initials: LP
authors.lastname: Chen
mesh_terms: D013766:5-Methyltetrahydrofolate-Homocysteine S-Methyltransferase / Q000235:genetics*; D000328:Adult; D000483:Alleles; D001943:Breast Neoplasms / Q000235:genetics* / Q000378:metabolism; D019587:Dietary Supplements; D005260:Female; D005492:Folic Acid / Q000008:administration & dosage* / Q000378:metabolism; D005787:Gene Frequency; D020022:Genetic Predisposition to Disease / Q000235:genetics*; D005838:Genotype; D006801:Humans; D042965:Methylenetetrahydrofolate Reductase (NADPH2) / Q000235:genetics*; D008875:Middle Aged; D016017:Odds Ratio; D016133:Polymerase Chain Reaction; D012150:Polymorphism, Restriction Fragment Length; D020641:Polymorphism, Single Nucleotide; D012307:Risk Factors; D014805:Vitamin B 12 / Q000008:administration & dosage / Q000378:metabolism; D025101:Vitamin B 6 / Q000008:administration & dosage / Q000378:metabolism; D014815:Vitamins / Q000008:administration & dosage / Q000378:metabolism
chemical_list: D014815:Vitamins; D025101:Vitamin B 6; D005492:Folic Acid; C573423:MTHFR protein, human; D042965:Methylenetetrahydrofolate Reductase (NADPH2); D013766:5-Methyltetrahydrofolate-Homocysteine S-Methyltransferase; C585801:MTR protein, human; D014805:Vitamin B 12