Comparison of Postoperative Anal Function Between Parks and Bacon Techniques in Low Rectal Cancer

Prior treatment

• Unachievable R0 resection due to invasion of adjacent organs by primary tumor;
• Participation in other clinical trials within the previous 4 weeks of enrollment;

Other illness

• Previous history of malignant colorectal tumors;
• Complications such as obstruction and gastrointestinal bleeding that need an emergency operation;
• History of other malignancy;
• Intolerance of surgery due to liver, renal, cardiopulmonary or coagulation dysfunction, or underlying diseases;
• History of serious mental disorders;
• Uncontrolled infection before operation;

Lab values

• Unsuitable to be included due to other clinical and laboratory conditions by the judgement of investigators.

Other

• Multiple primary tumors;
• ASA physical status score ≥ IV level and/or ECOG performance status ≥ 2;
• Women in pregnancy or lactation period;

• Men or women, aged between 18 and 75 years;
• Pathological diagnosis of rectal cancer before operation, with the distance from the lower edge of the tumor to the dentate line ≤ 3cm by MR imaging;
• No local complications (including complete/ incomplete obstruction, active bleeding, local invasion of sphincter or levator ani, etc.) before operation;
• Suitable for anal preservation surgery discussed by MDT;
• Adequate bone marrow, liver, renal and cardiac function meeting the requirements of surgery and anesthesia;
• R0 resection is expected technically;
• Provision of written informed consent.