Adenocarcinomas are malignant tumors that develop in the epithelial tissue, a thin tissue that covers all of the exposed surfaces on our bodies, as well as inside the mouth. It also appears as a part of the digestive system and the lining of the hollow parts of organs. Adenocarcinomas are often to blame for a diagnosis of breast, colon, and lung cancer. They can also appear in the bile duct, vagina, stomach, and prostate.

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