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A growth caused by uncontrolled or abnormal cell division, or the resulting condition experienced by the host. Cancer cells grow in an uncontrolled and abnormal way to form a so-called neoplasm; if the cells clump together this may result in a tumour. Benign tumours remain stationary and do not invade other tissues. Those from which cells are shed and migrate into other tissues and organs are malignant. Cancers are classified according to the type of tissue they affect. They include carcinomas (cancer of epithelial tissues, e.g. the lung), sarcomas (cancer of connective tissues, e.g. myelomas of bone) and lymphomas (cancer of the lymph or blood, e.g. leukaemia). Cancers have a wide range of causes: carcinogens in the environment, radiation and genetic and dietary factors; some viruses have been implicated. oncogene; ras gene.  



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Other Terms : concavo-convex | overtone | Stokes' theorem



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