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Cancer is the No. 2 cause of death in the US, second only to heart disease.

It fundamentally affects the way our cells grow and divide, changing them in perverse ways. All cancer is a result of damage or genetic mutations in our DNA. The nasty, debilitating class of diseases spreads through a body like an invading army, as toxic cells grow relentlessly into unruly tumors.

Some cases of cancer are out of ...