<prompt> Which of the following is true regarding male breast cancer?Associated with Klinefelters syndrome XXYInfiltrating ductal carcinoma is seen in 15Commonly seen in young malesTreatment is primarily medical  <response>: Fewer than 1 of all breast cancers occur in men. Male breast cancer is preceded by gynecomastia in 20 of men. It is associated with radiation exposure, estrogen therapy, testicular feminizing syndromes, and Klinefelters syndrome XXY. Breast cancer is rarely seen in young males and has a peak incidence in the sixth decade of life. DCIS makes up 85. The treatment of male breast cancer is surgical, with the most common procedure being a modified radical mastectomy. Ref: Wilhelm MC, Langenburg SE, et al: Cancer of the male breast, in Bland KI, Copeland EM III eds: The Breast: Comprehensive Management of Benign and Malignant Diseases. Philadelphia: WB Saunders, 1998, p 1416. 