SBRT Combined With Thymalfasin for Metastatic Esophageal Cancer

Patients with esophageal cancer that had metastatic lesions after been treated with definitive surgery or chemoradiotherapy are being asked to participate in this study. 1. To observe immunity-mediated tumor response after Stereotactic Body Radiation Therapy(SBRT) of a metastatic site in metastatic esophageal cancer patients. 2. To induce the efficacy (effectiveness) of a new combination of therapy, SBRT and thymalfasin for heavily pretreated, metastatic esophageal cancer patients; This study will help find out what effects (good or bad) the combination of radiotherapy and thymalfasin has on metastatic esophageal cancer.