Segmental versus extended colectomy for tumours of the transverse colon: A systematic review and meta-analysis.

AIM There is no consensus on the appropriate extent of oncological resection for tumours of the transverse colon. Concerns regarding tumour factors such as pattern of lymph node spread and technical factors such as anastomotic perfusion lead to a variety of procedures being performed. METHODS A comprehensive search for published studies examining outcomes following segmental versus extended colectomy for transverse colon tumours was performed adhering to PRISMA (Preferred Reporting Items in Systematic Reviews and Meta-analyses) guidelines. Random effects methods were used to combine data. RESULTS Seven comparative series examining outcomes in 3,395 patients were identified. Segmental colectomy results in shorter operating times (mean difference 15.80 minutes, 95% CI: -20.98 - -10.62, p<0.001) and less ileus (OR: 0.52, 95% CI: 0.33-0.81, p=0.004). There was no difference in length of hospital stay (mean difference 1.53 days, 95% CI: -3.79 - 0.73, p=0.18). Extended colectomy results in a lower rate of anastomotic leak (OR: 0.62, 95% CI: 0.40-0.97, p=0.04). There are less nodes retrieved in segmental colectomy (mean difference 7.60 nodes, 95% CI: -9.60 - -5.61, p<0.001) but no difference in disease recurrence (OR: 0.88, 95% CI: 0.59 - 1.34, p=0.56) or overall survival (OR: 0.98, 95% CI: 0.68-1.4, p=0.9). CONCLUSIONS Available data are limited due to a lack of randomized controlled trials. However, based on current evidence, segmental resection for transverse colon tumours is associated with less ileus but lower lymph node yields and higher anastomotic leak rates. Length of stay is similar. Oncological outcomes are equivalent.