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Finding and Surviving Ovarian Cancer Radiation Therapy What about radiation? How does that work? Radiation therapy uses very strong X-rays to kill the cancer cells. However, most cases of ovarian cancer do not get radiation therapy, because these tumors are quite sensitive to drug therapy. Therefore, at this time, radiation is used in ovarian cancer if chemotherapy has failed. . It can be used as a treatment alone or in combination with other treatments. There are two ways to deliver radiation treatment. First, X-ray beams can be aimed directly at the ovarian cancer cells from an external machine. Second, you can have special radioactive chemicals placed directly into your abdomen. This releases constant amounts of radiation to kill the cancer cells over a specific period of time. This period of time could be from minutes, to hours, to days.
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