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Lung cancer. Coloured 3-D computed tomography scan of a patient's chest showing a large malignant tumour (red) in the lung and spread of the cancer to a nearby lymph node (green). Bones are coloured yellow; the trachea and bronchi are blue. Lung cancer is one of the most common and dangerous forms of cancer - fewer than 10% of patients survive for more than five years after diagnosis. The main cause is cigarette smoking. Secondary lung cancer, resulting from spread of cancer cells from elsewhere in the body, is also a common cause. Treatment includes surgical removal of all or part of the lung, anti-cancer drugs and radiotherapy.
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