Breast Cancer in a 53-year-old Obese Male.

Male breast cancer (MBC) represents <1% of all breast cancers and little is known about its true etiology. The known risk factors associated with MBC are age, Klinefelter syndrome, BRCA2 mutation, high estrogen levels, gynecomastia, and cirrhosis of any cause. Obesity has been documented as a risk factor to MBC in some studies even though it is not officially recognized as a risk factor. Herein, we present a 53-year-old obese male with estrogen receptor-positive (ER+) breast cancer. Although this patient has a strong family history of ovarian cancer, obesity could have been an additive predisposing factor. As more cases of MBC in obese patients are explored, we might be able to gain a better understanding of its true etiology and mechanism.