Cookies on this website
We use cookies to ensure that we give you the best experience on our website. If you click 'Continue' we'll assume that you are happy to receive all cookies and you won't see this message again. Click 'Find out more' for information on how to change your cookie settings.

Epidemiological studies have reported inconsistent findings for the association between B vitamins and breast cancer (BC) risk. We investigated the relationship between biomarkers of folate and vitamin B12 and the risk of BC in the European Prospective Investigation into Cancer and Nutrition (EPIC) cohort. Plasma concentrations of folate and vitamin B12 were determined in 2,491 BC cases individually matched to 2,521 controls among women who provided baseline blood samples. Multivariable logistic regression models were used to estimate odds ratios by quartiles of either plasma B vitamin. Subgroup analyses by menopausal status, hormone receptor status of breast tumors (estrogen receptor [ER], progesterone receptor [PR] and human epidermal growth factor receptor 2 [HER2]), alcohol intake and MTHFR polymorphisms (677C > T and 1298A > C) were also performed. Plasma levels of folate and vitamin B12 were not significantly associated with the overall risk of BC or by hormone receptor status. A marginally positive association was found between vitamin B12 status and BC risk in women consuming above the median level of alcohol (ORQ4-Q1  = 1.26; 95% CI 1.00-1.58; Ptrend  = 0.05). Vitamin B12 status was also positively associated with BC risk in women with plasma folate levels below the median value (ORQ4-Q1  = 1.29; 95% CI 1.02-1.62; Ptrend  = 0.03). Overall, folate and vitamin B12 status was not clearly associated with BC risk in this prospective cohort study. However, potential interactions between vitamin B12 and alcohol or folate on the risk of BC deserve further investigation.

Original publication

DOI

10.1002/ijc.30536

Type

Journal article

Journal

Int J Cancer

Publication Date

15/03/2017

Volume

140

Pages

1246 - 1259

Keywords

MTHFR polymorphism, alcohol, breast cancer, folate, hormone receptor status, plasma biomarkers, vitamin B12, Adult, Aged, Alcohol Drinking, Biomarkers, Breast Neoplasms, Case-Control Studies, Diet, Estrogens, Europe, Female, Folic Acid, Folic Acid Deficiency, Follow-Up Studies, Genes, erbB-2, Humans, Life Style, Methylenetetrahydrofolate Reductase (NADPH2), Middle Aged, Neoplasms, Hormone-Dependent, Polymorphism, Single Nucleotide, Progesterone, Risk Factors, Vitamin B 12, Vitamin B 12 Deficiency