OUTLINE: Patients receive dose-intensive induction chemotherapy consisting of cisplatin IV over 6 hours on day 0; vincristine IV on days 0, 7, and 14; and etoposide and cyclophosphamide IV over 1 hour on days 1 and 2. Patients with M1+ disease (i.e., evidence of dissemination beyond primary tumor site) also receive methotrexate IV over 4 hours on day 3. Patients receive filgrastim (G-CSF) subcutaneously daily beginning on day 7 and continuing until blood counts recover. Chemotherapy continues every 21-28 days for a total of 3 courses in the absence of disease progression or unacceptable toxicity. Patients then undergo radiotherapy 5 days a week for 6.5 weeks beginning 3-6 weeks after completion of chemotherapy.