PRIOR CONCURRENT THERAPY: Biologic therapy: At least 14 days since prior immunologic agents No concurrent immunologic agents Chemotherapy: See Disease Characteristics At least 3 weeks since prior chemotherapy No concurrent chemotherapy Endocrine therapy: At least 2 weeks since prior high dose corticosteroids No concurrent anticancer hormonal therapy No concurrent corticosteroids Radiotherapy: At least 3 weeks since prior radiotherapy and recovered No concurrent radiotherapy Surgery: Not specified