proton-beam radiation therapy

Definition of proton beam radiation therapy
National Cancer Institute

proton beam radiation therapy

(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.

Source: NCI Dictionary of Cancer Terms