OUTLINE: The following acronyms are used: CCNU Lomustine, NSC-79037 PCB Procarbazine, NSC-77213 PCV PCB/CCNU/VCR VCR Vincristine, NSC-67574 3-Drug Combination Chemotherapy Followed by Radiotherapy. PCV; followed by external-beam cranial irradiation using at least 6 MV photons.