Teaching the Body to Kill Cancer

Researchers work on vaccines to fend off tumors

List: Showing scientists' strategies to harness the immune system to fight cancerBy LILA GUTERMAN

The human immune system is acutely sensitive to the body's enemies. Unperturbed by native cells, immune fighters roar into action when viruses or other foreigners infiltrate the body.

Unfortunately for many people, the immune system has difficulty telling friend from foe when confronted with cancer. Tumor cells so closely

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