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This article shows that the prognosis for kids with low grade brain tumors has become much better! 90% of the kids who did not get radiation were alive 20 years later. 70% of the kids who had radiation were alive 20 years later.
However, more research is needed. This study only looked at the diagnosis and if they had radiation or not. What wasn't accounted for is why 18% of kids got radiation. Perhaps they had larger tumors or worse location, not operable, etc.