自1975年6月至1986年5月来,采用随机分组的方法把收治的478例直肠癌分成术前放疗组231例(放疗后拒绝手术者未统计)及单纯手术组247例。除观察术前放疗的临床结果外,还结合病理组织学变化,指出术前放疗的最适宜剂量为4,000—5,000rads/4—5周完成,200rads/日,休息两周后手术。如术前放疗过程中附加直肠腔内微波热疗,可减少副反应,增加临床放射效应,此时放射剂量在3,000—4,000rads时较为适宜。通过不同 From June 1975 to May 1986, 478 cases of rectal cancer were treated by randomization into 231 cases of preoperative radiotherapy (not counted after radiotherapy) and 247 cases of surgery alone. In addition to the observation of preoperative radiotherapy clinical results, combined with histopathological changes, the optimal dose for preoperative radiotherapy was 4,000-5,000 rads/4 to 5 weeks, 200 rads/day, and surgery after two weeks of rest. Such as preoperative radiotherapy with additional microwave hyperthermia in the rectal cavity, can reduce side effects and increase clinical radiation effects, radiation dose at this time is more appropriate in the 3,000-4,000rads. Through different