PRIOR CONCURRENT THERAPY: Biologic therapy: No prior bone marrow transplantation Concurrent sargramostim (GM-CSF) allowed for severe, symptomatic neutropenia Chemotherapy: At least 4 weeks since investigational drugs Endocrine therapy: Not specified Radiotherapy: Not specified Surgery: Not specified Other: No concurrent use of investigational drugs or devices Concurrent epoetin alfa allowed for anemia Plasmapheresis allowed at study onset to treat renal failure