PRIOR CONCURRENT THERAPY: Biologic therapy: No prior immunologic therapy At least 1 week since prior hematopoietic growth factors or other blood products Chemotherapy: See Disease Characteristics No prior chemotherapy No other concurrent chemotherapy Endocrine therapy: Not specified Radiotherapy: See Disease Characteristics At least 4 weeks since prior radiotherapy Surgery: See Disease Characteristics At least 2 weeks since prior surgery Other: At least 4 weeks since prior investigational device or drug No other concurrent anticancer therapy No other concurrent investigational device or drug