Would it be appropriate to treat an adult with a pure germinoma at 1.8 Gy/ fraction instead of the pediatric dose of 1.5 Gy/ fx when treating with radiation alone to the whole ventricle (with cone down to primary)?  

We have utilized 1.8Gy per fraction as part of an institutional protocol for CNS germinomas since the 1990s with excellent results (Buckner J JCO 1999). Although the protocol was designed to examine the safety of focal radiotherapy in the setting of CR to induction chemotherapy, this protocol also ...