OUTLINE: Patients receive cyclophosphamide IV over 15 minutes, doxorubicin IV, and vincristine IV on day 1 and oral prednisone on days 1-5. Treatment is repeated every 21 days for up to 6 courses. Within 4-8 weeks after the last course of chemotherapy, patients who achieve at least a partial response and have less than 25% bone marrow involvement begin immunotherapy. Patients receive unlabeled monoclonal antibody anti-B1 (MOAB anti-B1) IV over 1 hour, then iodine I 131 MOAB anti-B1 IV over 20 minutes on day 1. This regimen is repeated on day 8. Patients are followed every 6 months for 2 years, then annually thereafter.