OUTLINE: This is a multicenter study. Patients receive rituximab IV on days 1 and 8 immediately followed by IDEC-In2B8 IV over 10 minutes on day 1. Patients also receive ibritumomab tiuxetan IV over 10 minutes on day 8. Patients are followed every 3 months for 2 years and then every 6 months for 2 years.