Cancer is the general name for a group of more than 100 diseases in which cells in a part of the body begin to grow out of control. Although there are more than 100 kinds of cancer, they all start because abnormal cells grow out of control.
Cancer cell growth is different from normal cell growth because cancer cells continue to multiply without any limit, whereas normal cells die and new cells grow in their place.
No matter where a cancer may spread, it is always named for the place where it started. Likewise, even though a breast cancer has spread to the liver, it would still be called breast cancer if that was the place it originated.
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