Minimally invasive surgical treatment of intrahepatic cholangiocarcinoma: A systematic review

BACKGROUND Intrahepatic cholangiocarcinoma(ICC) is the second most common primary liver cancer and is characterized by an aggressive behavior and a dismal prognosis.Radical surgical resection represents the only potentially curative treatment.Despite the increasing acceptance of laparoscopic liver resection for surgical treatment of malignant liver diseases, its use for ICC is not commonly performed.In fact, to achieve surgical free margins a major resection and/or vascular and/or biliary reconstructions is often needed, as well as an associated lymph node dissection.AIM To review and summarize the current evidences on the minimally invasive resection of ICC.METHODS A systematic review of the literature based on the criteria predetermined by the investigators was performed from the 1stof January 2009 up to the 1stof January 2021 in 4 databases(Pub Med, Scopus, Google Scholar, and Cochrane databases). All retrospective and prospective studies reporting on the comparative outcomes of open vs minimally invasive treatment of ICC were included. An evaluation of manuscripts quality was achieved using Methodological Index for NonRandomized Studies criteria and Newcastle-Ottawa Scale.RESULTS After a systematic search 9 studies fulfilled the inclusion criteria. Among the all 3012 included patients, 2450 were operated by an open approach and 562 by a minimally invasive(laparoscopic) approach. Baseline characteristics, tumor characteristics, surgical outcomes and oncological outcomes were collected and analyzed, highlighting values with a statistical significant difference between patients treated with open or laparoscopic approach. Shorter hospital stay and lower intraoperative blood losses were reported by some Authors in minimally invasive surgery, on the contrary, in the open group there was a higher number of lymphadenectomies and a higher percentage of major hepatectomies.CONCLUSION Minimally invasive resection of ICC has some short-term benefits and it is safe and feasible only in selected centers with a high experience in laparoscopic approach for liver surgery. Minimally invasive surgery, actually, was considered mainly in patients with a tumor with a diameter < 5 cm, without invasion of main biliary duct or main vessel and no vascular or biliary reconstructions were planned. Further studies are needed to elucidate its impact on long term oncologic outcomes.