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Radiation therapy (also called radiotherapy) is a cancer treatment that uses high doses of radiation to kill cancer cells and shrink tumors. At low doses, radiation is used in x-rays to see inside your body, as with x-rays of your teeth or broken bones.
How Radiation Therapy Works against Cancer At high doses, radiation kills cancer cells or slows their growth. Radiation therapy is used to:
• Treat cancer
Radiation can be used to cure cancer, to prevent it from returning, or to stop or slow its growth.