Peds cases are less common and we need to learn everything we can from each patient. Thus, the standardization of treatment, followup, and record-keeping that comes with treating on protocol is important. Yes, many PPs offers these protocols, but very few see enough peds cases where I'd be confident that they were being treated equivalently to a major medical center that sees many cases a day and has the support staff in place for these specific cases. Kids also have (the potential for) more long-term complications from XRT and special considerations, such as daily anesthesia, must be considered.