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The human body is made up of millions of cells that vary in shape, size and function. In healthy tissues, new cells are created during cell division, a process called mitosis. When cells become old, they "self-destruct" and die, a process called apoptosis.

A delicate balance must exist between the rate at which new cells are created and the rate at which old cells die. Cancer develops when the balance is disrupted and cells grow out ... more