Radiation therapy uses high energy x-rays to destroy cancer cells and to reduce the size of the tumors.
There are two types of radiation therapy.
External radiation therapy uses a machine outside the body to send radiation toward the cancer.
Internal radiation therapy uses a radioactive substance sealed in needles, seeds, wires, or catheters that are placed directly into or near the cancer.
The type of radiation therapy given depends on the stage of the cancer being treated.
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