食管癌是原发于食管粘膜上皮的恶性肿瘤,以局部侵犯为主,我国是世界上食管癌发病率和死亡率最高的国家之一,据估算,全世界约53.8%的食管癌病人在我国。据1990-1992年中国肿瘤防治办公室资料显示,食管癌的死亡率较以往有下降的趋势。然而,其死亡占全部恶性肿瘤死亡的16.05%,居第四位,在世界各国中位居前列[1]。食管癌是可治愈性疾病,同其他癌症一样治疗方法也有很多种,其中放射治疗就是食道 Esophageal cancer is a malignant tumor of esophageal mucosal epithelium, mainly to local violations, our country is the world’s highest incidence and mortality of esophageal cancer in one of the countries, it is estimated that about 53.8% of esophageal cancer patients in our country . According to the data of China Cancer Prevention and Control Office from 1990 to 1992, the mortality rate of esophageal cancer is declining from the past. However, its deaths accounted for 16.05% of all cancer deaths, ranking fourth in the world among the top [1]. Esophageal cancer is a curable disease, as with other cancers there are many treatments, including radiation therapy is the esophagus