The basic data were balanced as shown in Table 1, including age, sex, BMI, history of previous abdominal operation, accompanied disease, the average distance from the anal margin, ASA physical status classification, clinical stage (TNM) according to the American Joint Committee on Cancer guidelines (7th edition), tumor diameter, tumor histology, surgical procedures, prevented colostomy or ileostomy, lymphovascular invasion, and CEA level. Here, CEACAM5 is linked to neoplasm.