Understanding Cancer
Cancer begins in
cells, the building blocks that
make up tissues. Tissues make up the organs of the body.
Normally, cells grow and divide to form new cells as the body needs them.
When cells grow old, they die, and new cells take their place.
Sometimes this orderly process goes wrong. New cells form when the body
does not need them, and old cells do not die when they should. These extra
cells can form a mass of tissue called a growth or tumor.
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