OUTLINE: Patients receive rituximab IV on days 1, 8, and 15 and ifosfamide IV over 1 hour, etoposide IV over 2 hours, and carboplatin IV on days 2-4. Treatment continues every 21 days for 2 courses in the absence of disease progression or unacceptable toxicity. Patients who are not candidates for autologous stem cell transplantation may receive 1-4 more courses of chemotherapy without rituximab.