PRIOR CONCURRENT THERAPY: Biologic therapy: See Disease Characteristics At least 3 days since prior growth factors or intravenous immunoglobulin No concurrent cytokines or growth factors No concurrent intravenous immunoglobulin Chemotherapy: No concurrent chemotherapy No concurrent methotrexate IV or intrathecally Endocrine therapy: At least 3 days since prior corticosteroids No concurrent corticosteroids (except as premedication for documented severe transfusion reactions) Radiotherapy: Not specified Surgery: Not specified Other: At least 3 days since prior pentoxifylline or amphotericin B No concurrent pentoxifylline No other concurrent anticancer therapy