- Part A: Patients receive paclitaxel IV continuously on day 1 and ifosfamide IV over 4 hours on days 2-4. Autologous peripheral blood stem cells (PBSC) are harvested on days 11-13. Filgrastim (G-CSF) is administered subcutaneously (SC) twice daily beginning 6 hours after completion of paclitaxel and ifosfamide infusions and continuing until the last day of leukapheresis. Treatment continues every 2 weeks for 2 courses in the absence of disease progression or unacceptable toxicity. Before beginning the first course of chemotherapy, autologous bone marrow (ABM) is harvested, if possible, in case insufficient peripheral blood stem cells (PBSC) are harvested. Patients who were unable to undergo harvest of ABM before the first course of chemotherapy undergo harvest of ABM before beginning the second course of chemotherapy.