- Courses 1, 3, and 5 (28 days per course): Patients receive cisplatin IV over 6 hours on day 1, cyclophosphamide IV over 1 hour and etoposide IV over 2 hours on days 2 and 3, high-dose methotrexate IV over 4 hours on day 4, and filgrastim (G-CSF) subcutaneously (SC) beginning on day 5 and continuing until blood counts recover. Patients also receive vincristine IV on days 1, 8, and 15 of courses 1 and 3.