The infrapyloric (No.206) and greater curvature (No.204) lymph node metastasis in adenocarcinoma located at hepatic flexure and right half of transverse colon has not been well discribed and analysed. The aim of this study is to assess the rate of this lymph node metastasis and to reveal its prognostic value for colon cancer located at hepatic flexure and right half of transverse colon. Meanwhile, we can evaluate the safety and feasibility of this extented lymphadenectomy in right hemi-colectomy.

Inclusion Criteria:

• Age between 18 and 75 years
• American Society of Anesthesiologists (ASA) score I to III
• A biopsy proven histological diagnosis of colorectal carcinoma
• tumor located at hepatic flexure and right half of transverse colon
• Undergoing right hemi-colectomy with extented lymphadenectomy of infrapyloric (No.206) and greater curvature (No.204) lymph node
• Preoperative staging cT2-4aN0M0 or cTanyN+M0
• Willing to participate and informed consent signed

Exclusion Criteria:

• Pregnant or lactating women
• Synchronous colorectal carcinoma
• History of colorectal cancer or other malignant tumors
• Clinical evidence of metastasis
• Preoperative staging cT1N0 or cT4bNany
• Emergency procedure

Patients hospitalized in Shanghai Minimally Invasive Surgery Center