PRIOR CONCURRENT THERAPY: Biologic therapy: Not specified Chemotherapy: At least 30 days since prior chemotherapy and failed No planned chemotherapy within 38 days after study treatment Endocrine therapy: Not specified Radiotherapy: No planned laser therapy within 38 days after study treatment Surgery: At least 30 days since prior surgery and failed Other: No planned photodynamic therapy or sclerotherapy within 38 days after study treatment