Trial of Forodesine in Patients With Relapsed B-cell Chronic Lymphocytic Leukemia

Inclusion Criteria: * Patients with confirmed Binet Stage B or C B-CLL as defined by the National Cancer Institute (NCI) sponsored working group who have received up to 2 previous lines of treatment, one of which was fludarabine based. The two previous treatments could have included combination therapies. * Patients must be ≥18 years of age, have a life expectancy of \>6 months, and an Eastern Cooperative Oncology Group (ECOG) performance status of 0, 1, or 2. - Female patients must not be pregnant (as confirmed by negative pregnancy test for women of childbearing potential) and female and male patients must be willing to use effective contraception for the entire duration of treatment and 2 months thereafter. Exclusion Criteria: * Patients who have received more than 2 previous lines of treatment will be excluded from this study. * Additional groups of patients who may not participate in the study include: patients who are pregnant and/or nursing; patients on corticosteroid treatment; patients with active infection (bacterial, viral or fungal) or severe infection (WHO 4th degree) within the last 3 months; patients with total bilirubin \> 2 × ULN; patients with calculated creatinine clearance \<70 mL/min; patients with seropositivity for human immunodeficiency virus, hepatitis B virus, or hepatitis C virus; patients with any coexisting medical or psychological condition that would preclude participation in the required study procedures; patients who have participated in another clinical study \<6 weeks prior to this study; or patients with a known hypersensitivity to the study medication.