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What is Cancer?

Normally, human cells grow and divide to form new cells as the body needs them, replacing old cells that die. Cancer breaks down this orderly process and causes abnormal, old or damaged cells to survive when they should die, and new cells to form when they aren’t needed. Cells start to divide without control, clumping together, and spread into surrounding areas, damaging healthy tissues and forming growths called tumors.

Michelle LaRoweWhat is Cancer?