title: FibroTest and FibroScan for the prediction of hepatitis C-related fibrosis: a systematic review of diagnostic test accuracy.
abstract: BACKGROUND
  The accurate diagnosis of hepatitis C virus (HCV)-related fibrosis is crucial for prognostication and treatment decisions. Due to the limitations of biopsy, noninvasive alternatives including FibroTest and FibroScan have been developed. Our objective was to systematically review studies describing the accuracy of these tests for predicting HCV-related fibrosis.
  
  
  METHODS
  Studies comparing FibroTest or FibroScan versus biopsy in HCV patients were identified via an electronic search. Random effects meta-analyses and areas under summary receiver operating characteristics curves (AUC) were examined to characterize test accuracy for significant fibrosis (F2-4) and cirrhosis. Heterogeneity was explored using meta-regression.
  
  
  RESULTS
  Twelve studies were identified, 9 for FibroTest (N = 1,679) and 4 for FibroScan (N = 546). In heterogeneous analyses for significant fibrosis, the AUCs for FibroTest and FibroScan were 0.81 (95% CI 0.78-84) and 0.83 (0.03-1.00), respectively. At a threshold of approximately 0.60, the sensitivity and specificity of the FibroTest were 47% (35-59%) and 90% (87-92%). For FibroScan (threshold approximately 8 kPa), corresponding values were 64% (50-76%) and 87% (80-91%), respectively. Methodological quality, the length of liver biopsy specimens, and inclusion of special populations did not explain the observed heterogeneity. However, the diagnostic accuracy of both measures was associated with the prevalence of significant fibrosis and cirrhosis in the study populations. For cirrhosis, the summary AUCs for FibroTest and FibroScan were 0.90 (95% CI not calculable) and 0.95 (0.87-0.99), respectively.
  
  
  CONCLUSIONS
  FibroTest and FibroScan have excellent utility for the identification of HCV-related cirrhosis, but lesser accuracy for earlier stages. Refinements are necessary before these tests can replace liver biopsy.
authors.affiliation: Liver Unit, Division of Gastroenterology, Department of Medicine, University of Calgary, Calgary, Alberta, Canada.
authors.forename: Abdel Aziz M
authors.initials: AA
authors.lastname: Shaheen
authors.forename: Alex F
authors.initials: AF
authors.lastname: Wan
authors.forename: Robert P
authors.initials: RP
authors.lastname: Myers
mesh_terms: D019540:Area Under Curve; D015415:Biomarkers / Q000032:analysis; D001706:Biopsy; D019698:Hepatitis C, Chronic / Q000150:complications*; D006801:Humans; D008103:Liver Cirrhosis / Q000175:diagnosis* / Q000209:etiology / Q000473:pathology; D011237:Predictive Value of Tests; D012680:Sensitivity and Specificity
chemical_list: D015415:Biomarkers