 1. Patients with metastatic esophageal squamous cell carcinoma who have received initial treatment for the primary site including surgery, radiation or chemotherapy. Primary tumor site without progression at registration. The sites of allowed metastases are: peripheral lung, central lung, medistinalcervical lymph node, liver, spinalparaspinal, osseous, and abdominal-pelvic lymph node. All metastases not resected must be amenable to SBRT. 