Radiation therapy for breast cancer - Mayo Clinic - Whole breast radiation therapy
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External beam radiation of the whole breast. One of the most common types of radiation therapy after a lumpectomy is external beam radiation. Whole breast radiation therapy (WBRT) uses high-powered x-rays to kill breast cancer cells. Because radiation is most harmful to quickly growing cells, radiation therapy damages cancer cells more than normal cells. Sometimes, radiation will also target the lymph nodes in the armpit.