Patients receive rituximab IV on day 1, carboplatin IV on day 2, ifosfamide IV and etoposide IV on days 2-4 (R-ICE), and filgrastim (G-CSF) subcutaneously on days 6-13. Patients also receive oral MSC twice daily on days -7 to 0 and once daily in courses 1-2. Treatment with R-ICE and G-CSF repeats every 21 days for 3 courses in the absence of disease progression or unacceptable toxicity.