Cancer cells don't function properly, and they can spread to many areas of the body. Tumors are clusters of cells that are capable of growing and dividing uncontrollably; their growth is not regulated.
Certain risk factors increase the chance that a person will develop cancer. Many of these factors, such as smoking or eating an unhealthy diet, can be avoided. Others, such as family history and aging, can't, but everyone can benefit by avoiding known cancer risks.
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