- Regimen B (closed to accrual effective 3/30/2000): Patients receive three 21-28 day courses of the following chemotherapy: vincristine IV on days 0, 7, and 14 of each course; carboplatin IV over 4 hours on days 3 and 4 of each course; oral procarbazine daily on days 0-4; oral lomustine on days 3 and 4; and G-CSF SC daily beginning 24 hours following the last dose of carboplatin and continuing until blood counts recover or up to 48 hours before the start of the next course. On day 7 of each course, patients also receive peripheral blood stem cell (PBSC) reinfusion following chemotherapy. Oral lomustine is administered only for the first two courses.