Journal of the American College of Nutrition
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Considering the rising incidence of breast cancer and high prevalence of vitamin D deficiency in Iran, this case-control study aimed to investigate the relationship between serum concentration and intake of vitamin D and risk of breast cancer. ⋯ Results from this case-control study support the protective effect of higher serum concentration of 25(OH)D against breast cancer. Moreover, dietary but not total intake of vitamin D was associated with decreased risk of breast cancer.