PRIOR CONCURRENT THERAPY: Biologic therapy: See Disease Characteristics Chemotherapy: See Disease Characteristics No other concurrent chemotherapy Endocrine therapy: No concurrent corticosteroids except for transient control or prevention of nausea or vomiting Concurrent non-steroidal hormones for non-lymphoma-related conditions (e.g., insulin for diabetes) allowed Radiotherapy: No concurrent external beam radiotherapy during transplantation therapy Surgery: Not specified Other: No other concurrent antitumoral or investigational agents