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Cancer is a broad term. It describes the disease that results when cellular changes cause the uncontrolled growth and division of cells. Some sorts of cancer cause rapid cell growth, while others cause cells to grow and divide at a slower rate. Certain sorts of cancer end in visible growths called tumors, while others, like leukemia, do not. Most of the body’s cells have specific functions and glued lifespans. While it's going to sound sort of a bad thing, necrobiosis is a component of a natural and beneficial phenomenon called apoptosis. A cell receives instructions to die in order that the body can replace it with a more moderen cell that functions better. Cancerous cells lack the components that instruct them to prevent dividing and to die. As a result, they build up within the body, using oxygen and nutrients that might usually nourish other cells. Cancerous cells can form tumors, impair the system and cause other changes that prevent the body from functioning regularly. Cancerous cells may appear in one area, and then spread via the lymph nodes. These are clusters of immune cells located throughout the body. There are many causes of cancer, and a few are preventable. Other causes of cancer are not preventable. Currently, the foremost significant unpreventable risk factor is age.      

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