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NCI Dictionary of Cancer Terms


proton beam radiation therapy  listen  (PROH-ton beem RAY-dee-AY-shun THAYR-uh-pee)

  A type of radiation therapy that uses streams of protons (tiny particles with a positive charge) to kill tumor cells. This type of treatment can reduce the amount of radiation damage to healthy tissue near a tumor. It is used to treat cancers of the head and neck and organs such as the brain, eye, lung, spine, and prostate. Proton beam radiation is different from x-ray radiation.