PRIOR CONCURRENT THERAPY: Biologic therapy: See Disease Characteristics At least 1 month since prior biologic therapy Chemotherapy: At least 1 month since prior chemotherapy, including adjuvant therapy Endocrine therapy: At least 1 month since prior endocrine therapy No concurrent steroid therapy Radiotherapy: At least 1 month since prior radiotherapy Surgery: See Disease Characteristics At least 1 month since prior surgery