PRIOR CONCURRENT THERAPY: Biologic therapy: At least 4 weeks since prior biologic therapy and recovered No concurrent biologic therapy Chemotherapy: At least 4 weeks since prior cytotoxic chemotherapy and recovered No other concurrent cytotoxic chemotherapy Endocrine therapy: At least 4 weeks since prior hormonal therapy and recovered No concurrent hormonal therapy Radiotherapy: At least 4 weeks since prior radiotherapy No concurrent radiotherapy Surgery: At least 4 weeks since prior major surgery