美国Minnesota大学癌诊查中心,在25年中,定期进行直肠乙状结肠镜检查了18,158人,共103,645人次。由于每年定期作直肠乙状结肠镜检查和息肉切除,使下部肠癌发病率明显下降。发现的癌也皆属早期,局限于肠壁。根据该地区直结 At the Cancer Research Center of the University of Minnesota, USA, there were 18,158 patients undergoing rectal sigmoidoscopy for a total of 103,645 visits. Due to regular rectosigmoidoscopy and polypectomy every year, the incidence of lower bowel cancer is significantly reduced. The cancers found were also early and confined to the intestinal wall. According to the region