Abstract
Background: Breast cancer is the most common malignancy among women worldwide. In men, cases of breast cancer are few and accounts for less than 1% of all cases of breast cancer. Majority of male breast cancer is hormone receptor-positive. The incidence of male axillary accessory breast cancer derived from axillary accessory breast is very low. Here we report a case of male triple negative axillary accessory breast cancer.Case presentation: We present a case of a male triple negative axillary accessory breast cancer in a 67-year-old man that progressively increased in size through a period of 1 year. We performed right accessory breast resection and right axillary lymph nodes dissection. Postoperative pathological analysis revealed right accessory breast invasive ductal carcinoma with apocrine metaplasia. The tumor size was 3.5 * 3.3cm. In addition, 5 metastatic lymph nodes were seen in 27 axillary lymph nodes. Immunohistochemistry showed ER (-), PR (-), Ki-67 30%, HER2 (2 +), GATA-3 (+), GCDFP-15(+), and AR (+). Fish test obtained a negative result. The patient was treated with adjuvant chemotherapy and radiotherapy.Conclusion: Male triple negative axillary accessory breast cancer is rare. Treatment of male triple negative axillary accessory breast cancer is similar to that of women patients. Most patients undergo surgery and adjuvant chemotherapy.
Male Triple Negative Axillary Accessory Breast Cancer, a Case Report
