Efficacy and safety of irreversible electroporation in unresectable perihilar cholangiocarcinoma: a systematic review and meta-analysis

The prognosis of patients with perihilar-cholangiocarcinoma (PHC) is poor. The only potential curative treatment for patients with PHC is surgical resection, but the large majority present with unresectable disease at diagnosis. The standard of care in patients with unresectable PHC is palliative chemotherapy (CHT).Irreversible electroporation (IRE) has been introduced as a novel ablation technique, working predominantly nonthermal. This review aims to analyse the efficacy and safety of IRE in treating unresectable PHC. This systematic review and meta-analysis was performed according to a specific protocol designed a priori, and reported according to the PRISMA. PubMed/MEDLINE, Scopus, and Cochrane CENTRAL were used for the bibliographic research through December 2023. Primary Outcome of interest of our meta-analysis was the mean Overall Survival. Secondary outcomes were Progression-Free Survival and Adverse Event rate. Mean OS is estimated to be 25.49 months (CI 21.47-38.72 I2, 81.37%), PSF 17.86 (CI 13.00-22.72, I2 11.42%), with 12% (CI -7% to 31%, I2 83.57%) of AE incidence. High heterogeneity was found among studies, with no single study fully responsible for it, suggesting high variability among facilities\populations. IRE is an effective and relatively safe method in this group of patients. The lack of prospective studies and randomized trials comparing chemotherapy or locoregional treatment with IRE prevents drawing sufficiently robust conclusions. IRE appears is a safe and effective technique for treating unresectable perihilar cholangiocarcinoma.