Un carcinoma es una forma de cáncer con origen en células de tipo epitelial o glandular, de tipo maligno. Los dos grandes grupos de carcinomas son los carcinomas epidermoides y los adenocarcinomas. Los carcinomas constituyen el tipo más común de cáncer. Lugares comunes de carcinomas son la piel, la boca, el pulmón, la mama, el tracto digestivo y el útero.

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Carcinoma is a type of cancer that develops from epithelial cells. Specifically, 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. Carcinomas occur when the DNA of a cell is damaged or altered and the cell begins to grow uncontrollably and become malignant. It is from the Greek καρκίνωμα 'karkinoma' meaning sore, ulcer, or cancer, itself derived from karkinos 'crab'.

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