Prognostic effects of 25-hydroxyvitamin D serum concentrations in postmenopausal breast cancer

Background: Vitamin D has been inconsistently associated with breast cancer risk. Thus far, only one study has investigated its association with mortality after breast cancer diagnosis. We examined post-diagnostic serum concentrations of 25-hydroxyvitamin D [25(OH)D] in relation to all-cause mortality in postmenopausal breast cancer patients. Methods: Incident breast cancer patients aged 50–74 years were diagnosed between August 2002 and July 2005 and part of a population-based case-control study conducted in Germany (MARIE). Vital status was ascertained via local population registries up to the end of 2009, and…