PRIOR CONCURRENT THERAPY: Biologic therapy: At least 3 months since prior unconjugated anti-B-cell monoclonal antibody (mAb) (e.g., rituximab, Campath I) No prior anti-B-cell mAb conjugated to radioisotopes such as iodine I 131 (e.g., iodine I monoclonal antibody anti-B1) or yttrium Y No concurrent mAb therapy until 12 months after study No other biologic therapy (e.g., monoclonal antibodies, interferon alfa) for 12 months after study No concurrent hematopoietic growth factors other than filgrastim (G-CSF) Chemotherapy: See Disease Characteristics No chemotherapy within 5 days prior to PBSC collection No other concurrent chemotherapy for 12 months after study Endocrine therapy: Not specified Radiotherapy: See Disease Characteristics No concurrent radiotherapy for 12 months after study Surgery: Not specified