Pretreatment Serum Concentration of Vitamin D and Breast Cancer Characteristics: A Prospective Observational Mediterranean Study / Giuseppe Buono, Mario Giuliano, Carmine De Angelis, Rossella Lauria, Valeria Forestieri, Matilde Pensabene, Dario Bruzzese, Sabino De Placido, Grazia Arpino

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Bibliografía: p.563

The aim of this trial was to correlate pretreatment serum vitamin D levels with breast cancer and with patients’characteristics. Deficient vitamin D levels correlated with more aggressive disease (ie, high grade
node-positive breast cancer), and with a high body mass index. Should our findings be confirmed in large prospective studies, vitamin D could be used as an anticancer agent.
Background: Recent studies of the correlation between breast cancer (BC) and vitamin D yielded contrasting results.
Although preclinical and clinical evidence has implicated vitamin D in BC prevention and outcome, little is known about the link between vitamin D and specific BC histologically defined subtypes. In the attempt to clarify this association we correlated vitamin D levels with BC characteristics. Patients and Methods: We enrolled 220 pre- and postmenopausal women with early BC in this prospective observational trial. Data on the patients’ clinical and specific BC pathological characteristics were collected and related to vitamin D levels, stratified in deficient (< 20 ng/mL), insufficient (20-30
ng/mL), and sufficient (> 30 ng/mL). BC subtypes were defined according to the 14th St Gallen Breast Cancer
Conference. Results: Deficient vitamin D levels were correlated with Grade 3 (P ¼ .015) and node-positive (P ¼ .043) BC, and with a higher body mass index (P ¼ .017). Insufficient vitamin D levels were associated with estrogen receptor expression in the primary tumor (P ¼ .033). Vitamin D levels were unrelated to the histological molecular subtypes of BC.
Conclusion: Deficient vitamin D levels were correlated with more aggressive disease, namely, node-positive high grade BC, and with obesity. Should our findings be confirmed in larger prospective studies, nutritional programs designed to reduce body weight, and vitamin D supplementation might be considered a BC prevention strategy.