Adenocarcinoma is a type of cancer that forms in the glands or other structures that secrete mucus or other fluids. It can occur in various organs in the body, including the lungs, colon, pancreas, prostate, and stomach. Adenocarcinomas are among the most common types of cancer and can be aggressive. Treatment options for adenocarcinoma may include surgery, chemotherapy, radiation therapy, and targeted therapy. Researchers are continuously studying new treatment approaches and ways to improve early detection and diagnosis of adenocarcinoma.