Vitamin B12 deficiency: a new risk factor for breast cancer? - B12 deficiency and breast cancer risk
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Biomarkers of folate and vitamin B12 and breast cancer risk: report from the . Folic Acid Deficiency/blood; Folic Acid Deficiency/epidemiology*. A prospective epidemiologic study found a threshold level for serum vitamin B12, below which an increased risk of breast cancer among postmeno-pausal.