Hear Again
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Chemotherapy is drugs. Radiation is x-ray. They focus the radiation on the tumor specifically and shoot radiation into the area in order to shrink a tumor. It is often done prior to surgery if a tumor is too big to safely remove, or to help shrink an inoperable tumor. If there is a chance that there may be some of the margins remaining following surgery, they will often do radiation of the area.
As far as I know, I don't think my mother had radiation due to her pancreatic cancer. Do you know if radiation is normally performed for that kind of cancer or does it tend to be too far advanced in most cases? By the time my mother's cancer was detected, it had already invaded 95% of her organs.