对放射治疗的 175例T_3和 T_4期鼻咽癌进行临床分析.根据临床表现、CT扫描和 X线检查按长沙会议分期法进行原发灶 T分期.T_3和 T_4期 5 年生存率分别为31.6%(6/19)和19.5%(22/113).局部复发率为40.6%(71/175),死亡的143例中有64例死于复发.临床分析结果表明:鼻咽癌放疗失败的主要原因是局部复发,而复发的重要原因是临床和X线检查无法明确病变范围而造成效疗计划设计的盲目性,CT扫描克服了这些缺点.本组34例采用CT扫描,复发率17.6%,未用CT扫描者 43.3%(P<0.01). Radiotherapy of 175 cases of T_3 and T_4 nasopharyngeal carcinoma clinical analysis.According to clinical manifestations, CT scan and X-ray examination according to the Changsha meeting staging method of primary T staging.The T5 and T4 5-year survival rates were 31.6 % (6/19) and 19.5% (22/113) respectively.The local recurrence rate was 40.6% (71/175), and 64 of 143 deaths died of recurrence.Clinical analysis showed that the radiotherapy failed in nasopharyngeal carcinoma The main reason is the local recurrence, and the recurrence of an important reason is the clinical and X-ray examination can not clear the scope of lesions caused by the blindness of treatment plan design, CT scan to overcome these shortcomings.This group of 34 patients with CT scan, the recurrence rate was 17.6% , 43.3% without CT scan (P <0.01).