Clofarabine in Chronic Lymphocytic Leukemia

The first group of patients will be treated at the starting dose level of 2 mg/m2 over 1 hour daily for 5 days. Dosage escalation will be permitted in individual patients if no toxicity occurred during the preceding course. Subsequent dose escalations will be by 50% until Grade 2 toxicity, then by 35% until the maximum tolerated dose. Completion date provided represents the completion date of the grant per OOPD records