- Group II (PET positive): Patients receive Rituximab 375 mg/m2 IV Day 1, Ifosfamide 5000 mg/m2 IV over 24 hours Day 2, Carboplatin AUC 5 (max: 800 mg) IV Day 2, Etoposide 100 mg/m2 IV Days 1, 2, 3 (R-ICE), Mesna 5000 mg/m2 IV over 24 hours Day 2, and Filgrastim 5 mcg/kg/day subcutaneous (SC) Day 4 until absolute neutrophil count (ANC) recovery every 14 days for 4 courses in the absence of disease progression or unacceptable toxicity.