 3. Use of any standardexperimental anti-lymphoma drug therapy, including steroids dexamethasone dose 4 mgday or prednisone 20 mgday, within 3 weeks of initiation of the study or use of any experimental non-drug therapy e.g., donor leukocytemononuclear cell infusions within 56 days of initiation of the study drug treatment. Hydroxyurea is permitted up to 24 hours before the first dose of study drug in patients with rapidly-proliferating disease. 