Carcinoma (Gk. karkinos, or "crab", and -oma, "growth") is the medical term for the most common type of cancer occurring in humans. Put simply, a carcinoma is a cancer that begins in a tissue that lines the inner or outer surfaces of the body, and that generally arises from cells originating in the endodermal or ectodermal germ layer during embryogenesis. More specifically, a carcinoma is tumor tissue derived from putative epithelial cells whose genome has become altered or damaged to such an extent that the cells become transformed, and begin to exhibit abnormal malignant properties.

Read more about Carcinoma:  Carcinoma of Unknown Primary (CUP), Pathogenesis of Cancer, Pathogenesis of Carcinoma, Epidemiology of Carcinoma, In Situ, Classification of Carcinomas, Histological Types and Variants of Carcinoma, Frequent Organ Sites of Carcinoma, Invasion and Metastasis of Carcinomas, Diagnosis, Types of Carcinoma (by ICD-O Code), Staging, Grading