From the Division of Medical Oncology and Hematology, Los Angeles Biomedical Research Institute at Harbor-UCLA Medical Center, Torrance, CA, and St. Mary's Medical Center, Long Beach, CA
Authors disclosures of potential conflicts of interest are found at the end of this article.
Address reprint requests to Rowan T. Chlebowski, MD, PhD, Chief, Division of Medical Oncology and Hematology, Los Angeles Biomedical Research Institute at Harbor-UCLA Medical Center, 1124 W Carson St, Torrance, CA, 90502; e-mail: rchlebowski{at}gmail.com
Overview: Breast cancer has been the focus of chemoprevention efforts.1 Based on findings from observational studies, higher calcium intake, specifically higher vitamin D intake, and higher 25-hydroxyvitamin D levels have been associated with lower breast cancer risk in some reports. Supplementation with these agents has been proposed as a breast cancer risk reduction strategy.