PRIOR CONCURRENT THERAPY: Biologic therapy: See Disease Characteristics At least 7 days since prior immunomodulatory medications (e.g., interferon or interleukin-2) Chemotherapy: Not specified Endocrine therapy: At least 7 days since prior steroids Radiotherapy: Not specified Surgery: Not specified Other: At least 7 days since prior immunosuppressives (e.g., cyclosporine, tacrolimus, or mycophenolate mofetil) No concurrent immunosuppressive medications for graft versus host disease