OUTLINE: Patients receive dexamethasone IV followed by rituximab IV on days 1, 8, 15, and 22 for one course. Two months after initiating treatment, patients are evaluated for disease progression. Patients with stable or responding disease may receive monthly dexamethasone and rituximab therapy for up to 10 additional months. Patients are followed every 3 months for 2 years, then every 6 months for years 3-4, and then yearly for up to 5 years.