Meta-analysis and systematic review of liver transplantation as an ultimate treatment option for secondary sclerosing cholangitis.Introduction
 Secondary sclerosing cholangitis (SSC) is a chronic cholestatic biliary disease, characterized by inflammation, obliterative fibrosis of the bile ducts, stricture formation, and progressive destruction of the biliary tree, which leads to biliary cirrhosis.  In recent years, the development of secondary sclerosing cholangitis in critically ill patients (SSC-CIP) has increasingly been perceived as a separate disease entity.


 To perform a systematic review and meta-analysis of secondary sclerosing cholangitis and ischaemic cholangiopathy in post organ transplant patients and intensive care unit (ICU).


 Material and methods
 A comprehensive search strategy using the PubMed, Biosis, and EMBASE databases was designed to retrieve relevant clinical data from the published literature up to 2020.  Demographic characteristics, laboratory, transplantation, mortality rate, and follow-up data undergoing liver transplantation were extracted from the inclusion studies.  We used DerSimonian-Laird random-effects meta-analysis.  Analysis was carried out using R statistical software version 4.02.


 Results
 A total of 862 patients with SSC-CIP were extracted from 16 studies.  Eighteen studies were searched for the meta-analysis, out of which 16 studies were eligible for the meta-analysis and 2 were excluded.  A proportion meta-analysis was performed on liver transplant patients with SSC-CIP and on mortality rate.  Significant results were found (Prop = 0.30, 95% CI: 0.12-0.49, p < 0.01), with high heterogeneity among the studies (I 2 = 98%, p < 0.01) and (Prop = 0.45; 95% CI: 0.35-0.56 with I 2 = 80, p < 0.01), respectively.  No indication of publication bias, as confirmed by the funnel plot and the risk of bias in the included studies, shows that the study reporting is adequate to judge that no major or minor sources of bias are likely to influence results.


 The systematic review and meta-analysis show that liver transplantation is a valid option for patients with SSC-CIP, with excellent long-term outcome and improvement of quality of life.
R
A comprehensive search strategy using the PubMed, Biosis, and EMBASE databases was designed to retrieve relevant clinical data from the published literature up to 2020. 
PubMed
A comprehensive search strategy using the PubMed, Biosis, and EMBASE databases was designed to retrieve relevant clinical data from the published literature up to 2020. 
Biosis
A comprehensive search strategy using the PubMed, Biosis, and EMBASE databases was designed to retrieve relevant clinical data from the published literature up to 2020. 
EMBASE