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2012, Number 6

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Ann Hepatol 2012; 11 (6)

Validation and comparison of simple noninvasive models for the prediction of liver fibrosis in chronic hepatitis C

Fenili ATG, Jönck SG, Lazzarotto C, Pacheco SA, Manes J, da Graça FM, Cacese SMB, Narciso-Schiavon JL, Dantas-Correa EB, de Lucca SL

Language: English
References: 40
Page: 855-861
PDF size: 125.45 Kb.


ABSTRACT

Introduction. Although it is standard procedure in the evaluation of liver diseases, biopsy is an invasive method subject to sampling error and intra or inter-observer variability. Thus, surrogate markers of liver fibrosis have been proposed, with variable availability and accuracy. Aim. Validate and compare the performance of APRI and FIB-4 as predictors of liver fibrosis in HCV patients. Material and methods. Crosssectional study including patients with HCV-RNA (+) who underwent liver biopsy. Significant fibrosis was defined as METAVIR stage ≥ 2. The diagnostic performance of the models in predicting significant fibrosis were evaluated and compared by ROC curves. Results. The study included 119 patients, mean age 43.7 ± 10.6 years and 62% males. Significant fibrosis was identified in 41 patients. The AUROCs observed were: APRI = 0.793 ± 0.047, FIB-4 = 0.811 ± 0.045 and AST/ALT = 0.661 ± 0.055 (P = 0.054 for APRI vs. AST/ALT, and P = 0.014 for FIB-4 vs. AST/ALT). Considering classic cutoffs, the PPV and NPV for APRI and FIB-4 were, respectively, 77% and 92% and 83% and 81%. Thirteen (19%) patients were misdiagnosed by APRI and 16 (18%) by FIB-4. By restricting the indication of liver biopsy to patients with intermediate values, it could have been correctly avoided in 47% and 63% of the patients with APRI and FIB-4, respectively. Conclusion. The models APRI and FIB-4 were superior to AST/ALT ratio in the diagnosis of significant fibrosis in chronic HCV infection. Even though the overall performance of APRI and FIB-4 was similar, a higher proportion of patients may be correctly classified by FIB-4.


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