本研究目的：1、决定癌症治疗效果，2、直肠癌盆腔复发的危险因素，3、评价保留括约肌的长期效果。鉴于近十余年来对中段直肠癌及选择一些下段直肠癌行保存括约肌的切除术不断增加，本文回顾1977年至1990年134例中下段直肠癌行此术式的病历。男90女44例。平均年龄59岁。瘤下缘与肛下缘之间距离在 The purpose of this study: 1, determine the efficacy of cancer treatment, 2, rectal cancer risk factors for pelvic recurrence, 3, to evaluate the long-term effects of sphincter preservation. In view of the increasing resection of the preservation sphincter for the middle rectal cancer and the selection of some lower rectal cancer in the past decade, this paper reviews the medical records of 134 cases of middle and lower rectal cancer from 1977 to 1990. 90 males and 44 females. The average age is 59 years old. The distance between the lower edge of the tumor and the lower edge of the anus