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Carcinoma is any cancer that arises in epithelium, the tissue that lines the skin and internal organs of the body. It may occur in any tissue containing epithelial cells. In many cases site of origin of the tumor may be identified by the nature of cells it contains. Organs may exhibit more than one type of carcinoma.

Example: An adenocarcinoma and sqamous cell carcinoma may be found in the cervix

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