Etanidazole Terminated Phase N/A Trials for Adult Anaplastic Ependymoma / Adult Subependymoma / Adult Ependymoma / Adult Glioblastoma / Adult Giant Cell Glioblastoma / Adult Gliosarcoma / Adult Pineal Gland Astrocytoma / Adult Anaplastic Astrocytoma / Adult Myxopapillary Ependymoma / Adult Pilocytic Astrocytoma / Adult Mixed Glioma / Adult Diffuse Astrocytoma / Adult Oligodendroglioma / Adult Anaplastic Oligodendroglioma Diagnostic