Why is radiation used to treat brain tumors?

Tania B. Kaprealian, MD
Radiation Oncology
Radiation treats brain tumors by damaging the tumor's DNA. It does this either by directly hitting the DNA of the tumor or hitting a molecule of water, which causes a free-radical oxidant to then damage the DNA of the tumor. People should not take antioxidants during the treatment because this would counter the effects of the oxidants during the treatment. 

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