Neoadjuvant chemoradiotherapy has been recommended as the standard preoperative treatment for locally advanced rectal cancer. However, preoperative radiotherapy increases the risk of bowel dysfunction after sphincter-preserving surgery, for which patients suffer from incontinence, urgency, and unpredictability defecation problems. Furthermore, preoperative chemoradiotherapy is a potential risk factor of anastomotic leakage and stenosis after rectal cancer surgery. Unhealthy anastomosis, with both ends of injured bowel segments after pelvic radiation, is a major concern. When conventional surg
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