Cancer is the name given to a
collection of related diseases. In all types of cancer, some of the body’s
cells begin to divide without stopping and spread into surrounding tissues.
Cancer
can start almost anywhere in the human body, which is made up of trillions of
cells. Normally, human cells grow and divide to form new cells as the body
needs them. When cells grow old or become damaged, they die, and new cells take
their place.
When
cancer develops, however, this orderly process breaks down. As cells become
more and more abnormal, old or damaged cells survive when they should die, and
new cells form when they are not needed. These extra cells can divide without
stopping and may form growths called tumors.
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