Laparoscopic surgery for T4 colon cancer: a systematic review and meta-analysis

Charlotte E L Klaver, Tijmen M Kappen, Wernard A A Borstlap, Willem A Bemelman, Pieter J Tanis, Charlotte E L Klaver, Tijmen M Kappen, Wernard A A Borstlap, Willem A Bemelman, Pieter J Tanis

Abstract

Background: In colon cancer, T4 stage is still assumed to be a relative contraindication for laparoscopic surgery considering the oncological safety. The aim of this systematic review with meta-analysis was to evaluate short- and long-term oncological outcomes after laparoscopic surgery for T4 colon cancer, and to compare these with open surgery.

Methods: Using systematic review of literature, studies reporting on radicality of resection, disease-free survival (DFS), and/or overall survival (OS) after laparoscopic surgery for T4 colon cancer were identified, with or without a control group of open surgery. Pooled proportions and risk ratios were calculated using an inverse variance method.

Results: Thirteen observational cohort studies published between 2012 and 2017 were included, together consisting of 1217 patients that received laparoscopic surgery and 1357 with an open procedure. The proportion of multivisceral resections was larger in the open group in five studies. Based on 11 studies, the pooled proportion of R0 resection was 0.96 (95% CI: 0.91-0.99) and 0.96 (95% CI: 0.90-0.98) after laparoscopic and open surgery, respectively. Analysing (mainly) T4a subgroups in 6 evaluable studies revealed pooled R0 resection rates of 0.94 in both groups. No significant differences were found between laparoscopic and open surgery for any survival measure: RR 1.07 (95% CI: 0.96-1.20) for 3-year DFS, RR 1.04 (95% CI: 0.95-1.15) for 5-year DFS, RR 1.07 (95% CI: 0.99-1.14) for 3-year OS, and RR 1.05 (95% CI: 0.98-1.12) for 5-year OS.

Conclusion: Literature on laparoscopic surgery for T4 colon cancer is restricted to non-randomized comparisons with substantial allocation bias. Laparoscopic surgery for T4a tumours might be safe, whereas for T4b colon cancer requiring multivisceral resection it should be applied with caution.

Keywords: Locally advanced colon cancer; Minimally invasive surgery.

Conflict of interest statement

C.E.L. Klaver, T. M. Kappen, W.A.A. Borstlap, W.A. Bemelman, and P.J. Tanis have no conflicts of interest or financial ties to disclose.

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