(
eks-ray ther-uh-pee)
The use of high-energy
radiation from x-rays to kill cancer cells and shrink tumors. Radiation may come from a machine outside the body (
external-beam radiation therapy) or from materials called
radioisotopes. Radioisotopes produce radiation and can be placed in or near the tumor or in the area near cancer cells. This type of radiation treatment is called
internal radiation therapy, implant radiation, interstitial radiation, or brachytherapy. Systemic radiation therapy uses a radioactive substance, such as a radiolabeled monoclonal antibody, that circulates throughout the body. X-ray therapy is also called
radiation therapy, radiotherapy, and irradiation.
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