Evidence map of liver surgery: study protocol of a living systematic review

The amount of scientific data on liver surgery is exploding. There is a critical unmet need to develop tools that will facilitate navigating the literature and offer easy, fast and accurate access to data with a high level of evidence. Evidence maps (EM) combining living systematic reviews (SR) and user-friendly synthesis with graphs and figures were developed for this purpose in other medical fields and showed promising results but remain yet unavailable in liver surgery. The present study protocol aims to generate an EM in liver surgery, gathering randomised clinical trials (RCT) and SR.

A systematic search will be conducted in the Cochrane Central Register of Controlled Trials, Web of Science, Embase and Medline to identify all RCT and SR concerning liver surgery. RCT and SR will be classified in research topics. Selected endpoints will be extracted and meta-analysed. Results will be freely available for patients, clinicians and researchers via a web-based evidence map platform. EM and meta-analyses (MA) will be updated at regular intervals.

Including publicly available data, this type of study design did not require ethical committee approval. EM displays the required properties to facilitate literature search and to get a rapid overview of the current evidence, an unavailable tool in liver surgery, to date. Generating such an aid may considerably help patients, clinicians and researchers in many aspects: accessing accurate data, helping in decision-making and identifying gaps in the field. On completion of the project, results will be published, freely available via www.evidencemap.surgery and permanently updated.

CRD42023489201 (https://www.crd.york.ac.uk/prospero/).