Investigate the Radical Extent of Lymphadenectomy of LAparoscopic Right Colectomy for Colon Cancer(RELARC).

A Multicenter, Prospective, Randomized Clinical Trial to Investigate the Radical Extent of Lymphadenectomy: D2 Dissection vs. Complete Mesocolic Excision, of LAparoscopic Right Colectomy for Right-sided Colon Cancer.

To investigate whether extended lymphadenectomy (CME) in laparoscopic colectomy could improve disease-free survival in patients with right colon cancer, compared with standard D2 radical operation.

Our study design is a two-arm, parallel-group, single-blind randomized clinical trial. The enrolled colon cancer patients would be divided into the intervention group (CME group) and control group (D2 radical operation group).

The postoperative adjuvant chemotherapy is determined by the pathological results. For patients of stage Ⅲ and patients of stage Ⅱ with unfavorable histologic features, six months of adjuvant chemotherapy of XELOX or fluorouracil-based regimen are recommended.

The postoperative examination should be performed every four months in the first two years and every six months in the following three years, to exclude local recurrence and distant metastasis.

Our study is expected to last five years, of which two years for recruiting patients, three years for follow-up.

Inclusion Criteria:

1. Patients suitable for curative surgery 18-75years old
2. ASA grade I-III
3. Qualitative diagnosis: a pathological diagnosis of adenocarcinoma;
4. Localization diagnosis: the tumor located between the cecum and the right 1/3 of transverse colon;
5. Enhanced CT scan of chest, abdominal and pelvic cavity: assessment of tumor stage is T2-T4N0 or TanyN+; there is no distant metastasis.
6. Informed consent

Exclusion Criteria:

1. Simultaneous or simultaneous multiple primary colorectal cancer;
2. Preoperative imaging examination results show: (1) colon cancer of stage T1N0; (2) enlargement of lymph node at the root of mesocolon, in which case the D3 radical operation must be performed;
3. Preoperative imaging examination results show: (1) Tumor involves the surrounding organs and combined organ resection need to be done; (2)distant metastasis; (3)unable to perform R0 resection;
4. History of any other malignant tumor in recent 5 years, except for cervical carcinoma in situ which has been cured, basal cell carcinoma or squamous cell carcinoma of skin;
5. Patients need emergency operation;
6. Not suitable for laparoscopic surgery (i.e., extensive adhesion caused by abdominal surgery, not suitable for artificial pneumoperitoneum, etc).
7. Informed consent refusal