对７０例胸内食管癌随机分为两组，１组为扩大野放疗组，２组为常规野放疗组，进行前瞻性临床放疗研究，比较两组淋巴结转移情况。结果显示，疗后１组淋巴结转移出现的时间较２组晚且发生率低。３年内１组１１．４％，２组５４．３％，１、２组３、５年生存率分别为３５．６％、１５．９％及１５．４％、８．６％。提示：胸内食管癌设扩大野对区域淋巴结进行预防性照射可延缓淋巴结转移的时间，延长生存期 70 cases of intrathoracic esophageal cancer were randomly divided into two groups. One group was expanded wild radiotherapy group, and two groups were conventional radiotherapy group. Prospective clinical radiotherapy studies were conducted to compare lymph node metastasis between the two groups. The results showed that the lymph node metastasis in group 1 after treatment was later than the two groups and the incidence was low. Within 3 years, 11.4% in group 1 and 54.3% in group 2. The 3 and 5-year survival rates in groups 1 and 2 were 35.6%, 15.9%, and 15.4% and 8.6%, respectively. Tip: Intrathoracic esophageal cancer is designed to expand the field of prophylactic irradiation of regional lymph nodes can delay the time of lymph node metastasis and prolong survival