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The recognition of complex colonic polyps is increasing. Management varies considerably and the impact of this on clinical outcomes is unclear. The aim of this systematic review was to assess the impact of group decision-making strategies and defined selection criteria on the treatment outcomes of complex colonic polyps. Method A systematic literature review identified studies reporting complex polyp treatment outcomes and describing their decision-making strategies. Databases searched included PubMed, Web of Science, CINAHL and Scopus. Articles were identified by two blinded reviewers using defined inclusion criteria. The review protocol was registered on PROSPERO and performed in line with PRISMA guidelines. Results There were 303 identified articles describing treatment outcomes of complex colonic polyps. Only 9 of these fully described the decision-making strategy and met the inclusion criteria. The median adverse event, unsuspected malignancy and secondary surgery rates were 7.7%, 3.8% and 14.4% respectively. Grouping of articles into a hierarchy of decision-making strategies demonstrated a sequential reduction in secondary surgery rates with improving strategies. The secondary surgery rate was significantly lower in studies using group decision-making and defined selection criteria. There was no significant difference in comparisons of adverse event or unsuspected malignancy rates. Conclusions There is limited reporting of decision-making strategies in studies describing complex polyp treatment outcomes. The use of group decision-making and defined selection criteria may reduce the need for surgery in complex colonic polyps. This has implications of cost effectiveness for healthcare systems and benefits to patient quality of life.

O17 Multidisciplinary decision-making strategies may reduce the need for surgery in complex colonic polyps—a systematic review