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PHOTO: EAST NEWS/SCIENCE PHOTO LIBRARY Lung cancer cell. Coloured scanning electron micrograph (SEM) of a lung cancer cell. Cancer cells divide rapidly in a chaotic, uncontrolled manner. They may clump to form tumours, which invade and destroy surrounding tissues. Lung cancer is a common form of cancer, frequently associated with smoking tobacco and exposure to industrial air pollutants. It causes a cough and chest pain and may spread to other areas of the body. Treatment includes surgical excision of the affected areas of the lung, with radiotherapy and chemotherapy. Magnification unknown.

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