1. Male or female patients, under 22 years of age, with a documented histologic diagnosis of relapsed or refractory glioblastoma multiforme (GBM), anaplastic astrocytoma (AA), fibrillary astrocytomas (FA), pilomyxoid astrocytoma (PXA), oligodendroglioma, or anaplastic mixed oligoastrocytoma (AOA), or radiologically diagnosed brainstem glioma