Pronunciation: (RAY-dee-AY-shun THAYR-uh-pee)
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 radiation therapy uses a radioactive substance, such as a radiolabeled monoclonal antibody, that travels in the blood to tissues throughout the body. Also called irradiation and radiotherapy.
Definition from: Cancer.govDate last modified: 2008-10-23Radiation Therapy for CancerRadiation Therapy and You: Support for People With Cancer Radioterapia para cáncer: preguntas y respuestas La radioterapia y usted: Apoyo para las personas con cáncer