- Arm II: Beginning within 4 weeks after surgery, patients receive high-dose doxorubicin IV over 20 minutes followed by ifosfamide IV over 24 hours and G-CSF subcutaneously daily beginning 24 hours after completion of ifosfamide infusion and continuing for 10 days. Treatment continues every 3 weeks for 5 courses. Beginning within 6 weeks after completion of chemotherapy, eligible patients undergo radiotherapy as outlined below.