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persistent
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Web MD excerpt. Not sure that even today radiation therapy is fully understood.Watch the second part of the video and hope you find the right way to watch it.
'You may only get radiation therapy to treat your cancer. Or your doctor may combine it with surgery, chemotherapy, or immunotherapy.
Sometimes your doctor can give you radiation therapy before surgery to make your tumor smaller. You could also have it after surgery to stop the cancer from coming back.
Sometimes, radiation therapy happens before chemotherapy. Other times, it's combined with chemo.'