Combating cancer with the body's own defenses

In the past 40 years, scientists have learned a great deal about how cells become cancerous. Some of that knowledge has translated to new treatments, but most of the time doctors are forced to rely on standard chemotherapy and radiation, which can do nearly as much damage to the patients as they do the tumors. This series looks at targeted treatments that are on the horizon, and what needs to be done to make them a reality.

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