- Chronic lymphocytic leukemia (CLL)- Must be refractory to fludarabine; patients who fail to have a complete or partial response after therapy with a regimen containing fludarabine (or another nucleoside analog, e.g. 2-cladribine [CDA], pentostatin) or experience disease relapse within 12 months after completing therapy with a regimen containing fludarabine (or another nucleoside analog)