Carcinoma is a type of cancer that originates in the epithelial cells, which are the cells that line the surfaces of organs, glands, and body cavities. Carcinomas are characterized by uncontrolled growth and division of these cells and can occur in various tissues, including the skin, lungs, breast, prostate, and digestive tract. This term is often used to describe malignant tumors that arise from epithelial tissue.
