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Lung cancer. Light micrograph of a section through lung tissue, showing an epidermoid (skin-like) carcinoma. A carcinoma arises from epithelial cells, a cell type that lines the lungs and other body organs, as well as occurring in the skin. If the cancer is localised, surgical removal is possible. If it has spread, chemotherapy and radiotherapy are needed. Magnification unknown. (KEYSTONE/SCIENCE PHOTO LIBRARY/CNRI)