OUTLINE: This is a dose escalation study of etoposide. Patients undergo total body irradiation twice daily on days -8 to -5. Patients receive etoposide IV over 30 hours beginning on day -5 and cyclophosphamide IV over 1 hour on day -3 (beginning 6 hours after completion of etoposide infusion) and day -2. Peripheral blood stem cells are reinfused on day 0. Patients receive filgrastim (G-CSF) subcutaneously daily beginning on day 0 and continuing until blood counts have recovered for 2 days. Cohorts of 5 patients receive escalating doses of etoposide until the maximum tolerated dose (MTD) is determined. The MTD is defined as the dose preceding that at which 3 of 5 patients experience dose limiting toxicity. Patients are followed every month for 1 year and then every 6 months for 2.5 years.