Rituximab, Yttrium Y 90 Ibritumomab Tiuxetan in Patients W/Relapsed Stage II, III, or IV Follicular NHL

OBJECTIVES: Primary * To evaluate the 1-year progression-free survival of patients with relapsed stage II-IV follicular non-Hodgkin lymphoma treated with ESHAP chemotherapy for cytoreduction followed by yttrium Y 90 ibritumomab tiuxetan radioimmunotherapy. * To evaluate the median time to progression in these patients. Secondary * To evaluate the overall and complete response rates in patients treated with this regimen. OUTLINE: * ESHAP chemotherapy: Patients receive ESHAP chemotherapy comprising etoposide IV over 1 hour, methylprednisolone IV, cisplatin IV on days 1-4, and cytarabine IV over 2 hours on day 1. Treatment repeats every 28 days for 2 courses in the absence of disease progression or unacceptable toxicity. * Radioimmunotherapy: Between 4-6 weeks after completion of ESHAP chemotherapy, patients receive rituximab IV followed by indium In 111 ibritumomab tiuxetan IV over 10 minutes on day 1. Patients with \< 25% bone marrow involvement and expected biodistribution proceed to treatment. Patients receive rituximab IV followed by yttrium Y 90 ibritumomab tiuxetan IV over 10 minutes on day 7, 8, or 9. After completion of study treatment, patients are followed periodically.