- Courses 2 and 4 (28 days per course): Patients receive oral temozolomide once daily on days 1-5, oral etoposide once daily on days 1-10, cyclophosphamide IV over 1 hour on days 11 and 12, and G-CSF SC beginning on day 13 and continuing until blood counts recover. Patients also receive vincristine IV on days 1, 8, and 15 of course 2.