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The range of lymph node dissection for rectum and sigmoid cancer is a vital factor that determines the prognosis of patients. Insufficient range of dissection can lead to residual metastatic lymph nodes and have serious impacts on the prognosis of patients. Excessive range of dissection can result in greater surgical trauma, prolonged operation time, more blood loss, and higher rate of complication without oncological benefits. Individualizating the appropriate resection range of rectum and sigmoid colon cancer on the basis of standardi