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systemic radiation therapy

(sis-TEH-mik RAY-dee-AY-shun THAYR-uh-pee)
A type of radiation therapy in which a radioactive substance, such as radioactive iodine or a radioactively labeled monoclonal antibody, is swallowed or injected into the body and travels through the blood, locating and killing tumor cells.
Search NCI's Dictionary of Cancer Terms