I'm currently undoing chemotherapy (round 2 with intrathecal chemo is Dec 26). I'm fortunate to be under the care of arguably the best oncologist at UAB (University of Alabama at Birmingham - a major medical research center) and am going with his recommendations. If I had a child undergoing treatments and a trusted oncologist recommended radiation and explained the ins and outs and possibilities for the future, I'd go with it.
As a side note, several friends have recommended I try the 'natural herbal cure' but it's illegal in my state.