Radiation therapy

Radiation therapy

Radiation therapy, also called radiation oncology or radiotherapy, is a cancer treatment that uses ionizing radiation (high-energy x-ray or other particles) to destroy cancer cells. At high doses, radiation therapy kills cancer cells or slows their growth by damaging their DNA. Cancer cells whose DNA is damaged beyond repair stop dividing or die, which can take days or weeks of treatment, before DNA is damaged enough for cancer cells to die.

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