为分析联合应用X线接触治疗、外照射和铱植入的根治性单纯放疗对T_2～T_3直肠腺癌的长期控制效果,作者于1986—1996年间进行了研究。首次入组63例(56例用直肠腔内超声分期),必须是T_2～T_3、N_0～N_1、M_0包绕直肠周径少于2/3的中下段直肠腺癌。治疗先用X线接触疗法,接着外照射。X线接触疗法用菲利普RT50机,50 kV X线,经0.5 mm铝板滤过。第1、7和21 d 3次给肿瘤表面的平均总剂量为80 Gy。根据治疗中肿瘤的大小 To analyze the long-term efficacy of radiotherapy combined with X-ray exposure, external beam irradiation, and radical radiotherapy with iridium implantation on T 2 ~ T 3 rectal adenocarcinoma, the authors conducted a study from 1986 to 1996. For the first time, 63 patients (56 with rectal ultrasound) had T_2 ~ T_3, N_0 ~ N_1, and M_0 had rectal adenocarcinoma in the middle and lower rectum surrounding less than 2/3 of the rectum. Treatment first with X-ray therapy, followed by external irradiation. X-ray contact therapy using a Philips RT50 machine, 50 kV X-ray, filtered through a 0.5 mm aluminum plate. The average total dose to the tumor surface on the 3rd, 7th and 21th d was 80 Gy. According to the size of the tumor in the treatment