OUTLINE: Patients receive cisplatin IV over 6 hours, etoposide IV, and vincristine IV over 1-2 minutes on day 1; etoposide IV and cyclophosphamide IV over 1-2 hours on days 2-3; filgrastim (G-CSF) subcutaneously (SC) on days 4-13; and vincristine IV over 1-2 minutes on day 15. Treatment repeats every 42 days for up to 3 courses in the absence of disease progression or unacceptable toxicity.