cancers occur when the rate of cell multiplication is faster than the rate of cell death. this causes the growth of a tumor, often in tissues with a high rate of mitosis , such as the lung, bowel and bone marrow.
cancers are caused by damage to DNA. DNA can be easily damaged by physical factors such as UV light. it can also be damaged by chemicals, known as carginogens, which may be in the enviroment or can be produced by cell metabolism. mutations can also occur when cells divide, for example if DNA is copied incorrectly in gemete formation , an inherited form of cancer can result.
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