PRIOR CONCURRENT THERAPY: Biologic therapy: See Disease Characteristics No prior radioimmunotherapy At least 6 months since prior autologous bone marrow transplantation and recovered At least 4 weeks since prior colony-stimulating factors or epoetin alfa At least 3 weeks since prior immunotherapy and recovered No concurrent hematopoietic growth factors Chemotherapy: See Disease Characteristics At least 3 weeks since prior chemotherapy (6 weeks for nitrosourea or mitomycin) and recovered Endocrine therapy: At least 3 weeks since prior corticosteroids No corticosteroids during or for 8 weeks after study Radiotherapy: See Disease Characteristics See Biologic therapy At least 3 weeks since prior radiotherapy and recovered Surgery: Not a recipient of an allogeneic organ transplantation, unless organ is no longer functional At least 4 weeks since any prior major surgery (except diagnostic surgery) and recovered