A cancer developing from cells that line the skin or inner organs, called epithelial cells.

Carcinoma is a cancer that starts in the cells that line the skin or inner organs, called epithelial cells. Examples are certain skin, colon, liver, lung, breast and prostate cancers.

Symptoms of carcinoma of the organs may include abdominal pain and weight loss. Symptoms of carcinoma of the skin may include sores on the skin that don't heal or areas that are raised and discolored.

Treatment depends on the type of cancer. Surgery, radiation and chemotherapy may be used.