LISH Trial for the Hepatic Flexure and Proximal Transverse Colon Cancer

Inclusion Criteria: 1. Age between 18-75 years old 2. ASA classification ≤III 3. Colon adenocarcinoma confirmed by endoscopy and pathological biopsy 4. Enhanced abdominal CT indicating the primary lesion is located in the hepatic flexure of the colon or proximal transverse colon (proximal 1/3 of the transverse colon) 5. Preoperative clinical staging: TanyNanyM0 6. Patients able to understand the study protocol, willing to participate in the research, and providing written informed consent Exclusion Criteria: 1. Preoperative examination indicates synchronous multiple primary colorectal cancers or other diseases requiring bowel segment resection 2. Preoperative imaging or intraoperative exploration reveals: 1) tumor involving surrounding organs requiring combined organ resection; 2) presence of distant metastasis; 3) inability to perform R0 resection; 4) fused and fixed lymph nodes at the root of the ileocolic vessels 3. Additional radical surgery following Endoscopic Mucosal Resection (EMR) and Endoscopic Submucosal Dissection (ESD) procedures 4. History of any other malignant tumor within the last 5 years or familial adenomatous polyposis, except for cured in situ cervical cancer, basal cell carcinoma, papillary thyroid carcinoma, or skin squamous cell carcinoma 5. Presence of bowel obstruction, bowel perforation, or intestinal bleeding requiring emergency surgery 6. Patients unsuitable for or unable to tolerate laparoscopic surgery 7. Pregnant or lactating women 8. Patients with a history of psychiatric disorders 9. Patients who have received neoadjuvant therapy prior to surgery 10. Patients deemed unsuitable for the study by MDT discussion 11. Patients unable to understand the study's conditions and objectives, and refusing to sign informed consent.