PRIOR CONCURRENT THERAPY: Biologic therapy: Not specified Chemotherapy: See Disease Characteristics At least 4 weeks since prior chemotherapy No other concurrent local or systemic chemotherapy Endocrine therapy: No concurrent systemic corticosteroid therapy Radiotherapy: No prior radiotherapy to sole index lesion Concurrent radiotherapy to any lesion allowed if not the sole target lesion Surgery: Not specified Other: No prior embolization to sole index lesion No other concurrent investigational drug No concurrent warfarin