PRIOR CONCURRENT THERAPY: Biologic therapy: No more than 1 prior biologic therapy At least 4 weeks since prior biologic therapy Chemotherapy: No more than 1 prior chemotherapy At least 4 weeks since prior chemotherapy Endocrine therapy: No more than 1 prior hormonal therapy At least 4 weeks since prior hormonal therapy Radiotherapy: At least 4 weeks since prior radiation therapy No prior radiation therapy if entire tumor was within radiation field Surgery: Not specified