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Radiation therapy is one of the most common treatments for cancer and is used in more
than half of all cases. It is effective in almost every part of the body. Other names
for it include radiotherapy, x-ray therapy, cobalt therapy and irradiation. Radiation
therapy uses high-energy radiation from x-rays, neutrons, and other sources to destroy
the ability of cancer cells to divide and multiply. Unlike chemotherapy, which exposes
the entire body to cancer-fighting chemicals, radiation therapy affects only the tumor
and surrounding area.
Radiation therapy can be delivered externally by beam or internally by placing radioactive
materials in or near the cancer cells. Before treatment begins, very precise planning
must occur.
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