Secretory breast carcinoma is a type of breast cancer characterized by abundant secretion of a substance called mucin within the tumor itself. Symptoms may include: lumps on the breast (sometimes painful), enlarged male breasts, ulceration (sores and breaks in the breast's skin), and bleeding from the nipple. Secretory breast cancer only accounts for 1% of all breast cancers. This condition can occur in people of all ages, but typically occurs in women around 25 years old. The average size of the tumor is 3 cm, but that can be anywhere from 1 to 16 cm. Secretory breast carcinoma is slow growing and prone to reoccur. Spreading of the cancer is relatively rare. This type of breast cancer can be treated in multiple ways, and should be treated as quickly as possible. Secretory breast carcinoma has a good prognosis with five-year survival in younger patients approaching 100%.