放射治疗是食管癌的主要治疗手段之一。大多数文献报道单纯放疗５ａ生存率在１０％左右。局部未控制与复发是治疗失败的主要原因，高达８０％左右。此外，远处转移也是重要原因之一，尸检证实许多临床上认为病灶局限的食管癌，５０％以上有远处转移，７０％以上有广泛淋巴结转 Radiation therapy is one of the main treatments for esophageal cancer. Most of the literature reported that the radiotherapy 5a survival rate was about 10%. Local uncontrolled and relapsed are the main reasons for treatment failure, as high as 80%. In addition, distant metastasis is also one of the important reasons. Autopsy confirmed that many esophageal cancers that are clinically confined to lesions have distant metastases of more than 50%, and 70% have extensive lymph node metastases.