Plasma B-vitamins and one-carbon metabolites and the risk of breast cancer in younger women

We examined the association of plasma B-vitamins and metabolites, and related genetic variants, with risk of breast cancer among predominantly premenopausal women. We conducted a nested case–control study within the Nurses’ Health Study II. From blood samples collected in 1996–1999 and follow-up through 2007, plasma measures were available for 610 cases and 1207 controls. Unconditional multivariable logistic regression was used to estimate...