Cancer develops when The cells in any part of the body start to grow out of control. There are many different kinds of cancer but all of them come back to this, abnormal cell growth. Throughout a persons life cells are constantly dividing and doubling to replace other dieing cells. Cancer cells continue to grow and divide without dieing. People develop cancer because of damaged DNA. Cancer is always traced back to DNA. Sometimes DNA can be damaged by something in the environment, such as smoking, in turn causing cancer. Most cancers cause tumors, with the exception of leukemia. Cancer c
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