Immune response after laparoscopic colectomy for cancer: a review

Background and aim: Colorectal cancer (CRC) is the third leading cause of cancer mortality worldwide and laparoscopic colectomy has been established as equivalent to the open approach in terms of oncological results and patients' safety. Survival benefits have been reported in favor of laparoscopic colectomy (LC) in stage III CRC patients. Different immune responses after surgery, in terms of innate and cellular immunity, may potentially explain some of the reported differences. This review summarizes the literature on differences in immune response after the laparoscopic and the open approach for CRC. Materials and Methods: A literature search of electronic databases was conducted and all studies published on 'colorectal cancer', 'laparoscopic and open colectomy' 'immune response' and 'surgical stress laparoscopy versus open' were collected. Among these, the ones referring to CRC and those that had any clinical relevance offering information on perioperative parameters were used. Results: Despite the heterogeneity of studies, they support the view that innate immune response is activated to a greater degree in open colectomy (OC), which may be related to the more extensive trauma and surgical stress. On the other hand, cellular immunity is better preserved after LC. These differences are more pronounced in the immediate postoperative period. Conclusions: LC has been related to decreased up-regulation of innate immunity and better-preserved cellular immunity. The latter may be related to better anti-tumor activity and may be beneficial in terms of oncological survival in a subgroup of LC patients.