[Evaluation of preoperative radiotherapy or chemoradiotherapy in sphincter preservation for locally advanced middle-low rectal cancer].

Objective: To investigate the effect of preoperative radiotherapy or chemoradiotherapy on the sphincter preservation and local tumor control as well as survival for the patient with locally advanced middle-low rectal cancer.

Methods: 121 locally advanced middle-low rectal cancer patients were treated with preoperative radiotherapy or chemoradiotherapy followed by surgery after rest of 4 to 6 weeks. 103 of these patients who underwent radical surgery were finally included in this study.