After day 21, patients receive high-dose chemotherapy consisting of etoposide IV over 1 hour followed by cisplatin IV over 1 hour, and ifosfamide IV over 1 hour on days -6 through -2. PBSCs are infused on day 0. Patients receive daily G-CSF subcutaneously beginning on day 1 and continuing through day 19 or until blood counts have recovered. Treatment repeats every 3 weeks for 3 courses in the absence of disease progression or unacceptable toxicity.