Background Treatment of undifferentiated embryonal sarcoma of the liver (UESL) is a great clinical challenge due to its rarity. This study aims to examine the long‐term survival of UESL patients after treatment using different therapeutic modalities. Methods A pooled analysis of individual data was performed on all UESL patients obtained from literature search (n = 307) and our institution (n = 1). Results The 5‐year overall survival rate of the 308 patients was 65.8%, 70% for partial hepatectomy group (n = 271), 78.9% for liver transplantation group (n = 14) and 6.6% for nonsurgical treatment group (n = 23). For patients receiving partial hepatectomy, paediatric patients, radical resection and combined chemotherapy were independent predictors for improved survival. Conclusion Radical hepatectomy combined chemotherapy should be considered as the preferred treatment option for USEL. Liver transplantation appears to be a reasonable alternative for unresectable disease.

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Background The incidence of intrahepatic cholangiocarcinoma (ICC) has increased worldwide in recent years, but the risk factors of ICC have not yet been clearly defined. The aim of this study was to identify risk factors for ICC. Methods A literature search was conducted in PubMed database for eligible studies published from January 2000 to November 2018. Summary odds ratio (OR) with their corresponding 95% confidence intervals (CI) were calculated using a random-effects model. Results Thirty-two studies (5 cohort, 27 case control) were included in this meta-analysis. Pooled estimates indicated that cirrhosis (OR=11.96, 95% CI 7.53-19.00), hepatitis B virus (HBV) infection (OR=4.09, 95% CI 3.13-5.34), hepatitis C virus (HCV) infection (OR=3.94, 95% CI 2.85-5.45), alcohol consumption (OR=2.68, 95% CI 1.97-3.66), hepatolithiasis (OR=14.94, 95% CI 6.41-34.83), choledochal cyst (OR=21.67, 95%CI 10.83-43.36), primary sclerosing cholangitis (PSC) (OR=93.91, 95%CI 43.99-200.47), diabetes mellitus (OR=1.82, 95% CI 1.57-2.11), non-alcoholic fatty liver disease (OR=2.23, 95% CI 1.65-3.02), liver fluke infection (OR=2.28, 95% CI 1.30-4.01) and smoking (OR=1.26, 95% CI 1.07-1.49) were significantly associated with ICC. Non-significant association was found between ICC and history of cholecystectomy, hypertension, coffee and aspirin. Conclusions Cirrhosis, HBV infection, HCV infection, alcohol consumption, hepatolithiasis, choledochal cyst, PSC, diabetes mellitus, non-alcoholic fatty liver disease, liver fluke infection and smoking are risk factors for ICC.