In this clinical trial, the investigators compared anal function, genitourinary function, quality of life, perioperative safety, and oncological prognosis after CSPO for patients with low rectal cancer, using ISR as a control, to provide high-level evidence-based medical evidence for the choice of anorectal preservation surgical approaches for patients with low rectal cancer.
Age: 18-75 years;
Pathologically confirmed: moderately & well-differentiated rectal cancer;
Low rectal cancer: lower edge of tumor ≦5cm from anal verge or ≦2cm from dentate line;
Tumor diameter: ≤3cm or <1/3 bowel circumference;
Combination of synchronous or metachronous (within 5 years) malignant tumors;
Combined distant metastasis of the tumor;
Combined intestinal obstruction, intestinal perforation, or intestinal bleeding requiring emergency surgery;
Combined psychiatric disorders that do not allow them to understand and participate in the study;