"In a study reported in the International Journal of Radiation Oncology Biology Physics, Emma C. Fields, MD, of the University of Colorado School of Medicine, and colleagues analyzed the stage-specific management of male breast cancer with surgery and radiation therapy and related them to outcomes and to female breast cancer. They found that breast conservation is less frequently performed in males with localized disease and that postmastectomy radiotherapy is greatly underutilized in males.
This study, the largest evaluation of male breast cancer in the United States with a focus on management and outcomes, included 4,276 cases of male breast cancer and 718,587 cases of female breast cancer extracted from the Surveillance, Epidemiology, and End Results registry. Analyzable data included sex, age, year of diagnosis, race, tumor registry, grade, stage, estrogen receptor status, progesterone receptor status, type of surgery, and use of radiation therapy. Male breast cancer constituted 0.6% of all evaluable breast cancer cases, and female breast cancer constituted 99.4%."