Diagnostic serum vitamin D level is not a reliable prognostic factor for resectable breast cancer

Aim: There are inconsistent results about the effects of vitamin D level on breast cancer prognosis. We aimed to investigate the effect of vitamin D levels on the prognosis of resectable breast cancer in a patient group with highly different clothing styles. Patients & methods: A total of 186 breast cancer patients were enrolled in the study. Results: Vitamin D level was sufficient, insufficient and deficient in 17.2, 52.2 and 30.6% of patients, respectively. There was a significant relationship between clothing style and serum 25 (OH) D levels. We could not establish any relation between vitamin D level and tumor characteristics or survival. Conclusion: Vitamin D supplementation can be more important than diagnostic serum vitamin D level on prognosis of breast cancer.