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The use of high-energy radiation from x-rays, gamma rays, neutrons, protons, and other sources
to kill cancer cells and shrink tumors. Radiation may come from a machine outside the body
(external-beam radiation therapy), or it may come from radioactive material placed in the body
near cancer cells (internal radiation therapy). Systemic irradiation uses a radioactive substance,
such as a radiolabeled monoclonal antibody, that travels in the blood to tissues throughout the
body. Also called radiation therapy and radiotherapy.