To investigate whether laparoscopic ileocecus-sparing right hemicolectomy is feasible and oncologically safe

Our study is a single arm, single center clinical trial. The enrolled patients will accept laparoscopic ileocecus-sparing right hemicolectomy. The primary endpoint: postoperative complications, 1-year local recurrence. The second endpoint: conversion to conventional right hemicolectomy, time to first flatus after surgery, number of harvested lymph nodes, 3-year disease free survival, R0 resection, Specimen morphometry

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 at hepatic flexure and proximal transverse colon(proximal to the right branch of middle colic artery);
5. Enhanced CT scan of chest, abdominal and pelvic cavity: assessment of tumor stage is T1-T4N0 or TanyN+; there is no distant metastasis.
6. Intraoperative measurement: the distance between colic branch of ileocolic artery and proximal edge of the tumor should be longer than 5cm.
7. Informed consent

Exclusion Criteria:

1. Simultaneous or metachronous multiple primary colorectal cancer;
2. History of familial adenomatous polyposis, ulcerative colitis or Crohn's disease.
3. Preoperative imaging examination results show: fused lymph node at the root of ileocolic artery.
4. Distant metastasis.
5. History of any other malignant tumor in recent 5 years.
6. Patients need emergency operation.
7. Not suitable for laparoscopic surgery (i.e., extensive adhesion caused by abdominal surgery, not suitable for artificial pneumoperitoneum, etc).
8. Informed consent refusal