 Between December 2013 and August 2014, newly diagnosed within 6 months BC female patients referred to the oncology sector of the Teaching Hospital of the Federal University of Pelotas and to the Radiotherapy and Oncology Center of Santa Casa de Misericordia of Pelotas were invited to the study, before starting any adjuvant or neoadjuvant treatment. Women with a recidivated tumor, HIV infection, renal, heart or liver disease, hypothyroidism or hyperthyroidism, mobility or neurological limitations, chronicle use of corticosteroids, pacemakers or identified with severe edema were excluded. For each cancer case, one female control should be matched for age 5 years and menopausal status pre and post-menopausal. Apart from being free from all the exclusion criteria used for BC cases, controls should also have no signs of malignant disease. These women were invited to participate in the study while frequenting the Gynecologic Ambulatory of the same institutions, in the same period. 