- Patients must have disease that has relapsed from or is refractory to standard cytotoxic therapy; patients must have received at least one standard cytotoxic drug regimen; there is no limit on the number of prior therapies, including high dose chemotherapy regimens, provided the patient has recovered from prior toxicities; relapsed disease is defined as the development of lymphadenopathy, splenomegaly, malignant lymphocytosis greater than 5,000, or infiltration of the bone marrow with malignant lymphocytes in a patient who had previously achieved a response of at least six months in duration; refractory disease is defined as never achieving a PR or a CR or PR that is less than six months in duration; prior total body irradiation is not allowed; radiation to individual site is permitted, and is not included as a regimen