Patients in group 2 will receive fludarabine on Days 1-3, mitoxantrone on Day 1, and dexamethasone on Days 1-5 of each 28-day cycle. When 8 cycles of treatment are finished, patients will begin receiving the drug interferon on Days 1-14 each month for 1 year. Dexamethasone will be given on Days 1-3 every month for 1 year. About 4 months after interferon treatment starts, patients in group 2 will begin receiving rituximab once a month for 6 months.