- Patients must have a confirmed diagnosis of relapsed or refractory HL with at least 10% of malignant Reed-Sternberg cells or infiltrating T-cells expressing CD25 (IL-2R alpha). A. Patients must have at least one of the following: (1) had an initial relapse less than 12 months after achieving a complete response (CR) with primary chemotherapy for HL; (2) were Staged at III/IV at diagnosis; (3) exhibited chemotherapy resistant disease or (4) did not achieve a CR with cytoreductive chemotherapy prior to a planned transplant. B. Patient must have a lesion of at least 1.0 cm in its greatest diameter. C. Patients with lymphocyte predominant HL are excluded. D. Patients with pre-existing myelodysplastic syndrome (MDS) or marrow cytogenic abnormalities will not be eligible to participate.