High diagnostic value of transient elastography for advanced fibrosis and cirrhosis in patients with chronic hepatitis delta

Abstract

Liver biopsy remains the gold standard for fibrosis staging in patients with chronic hepatitis delta (CHD). Here we comparatively evaluated the performance of transient elastography (TE) and biomarkers for the diagnosis of liver fibrosis in patients with CHD. 230 HDV-infected RNA-positive patients from various centers who underwent liver biopsy and liver stiffness measurements (LSM) using Fibroscan®, within a period of 6 months maximum, were investigated retrospectively. AUROC and Youden index were used to establish cut-off values of LSM. TE was compared with other noninvasive tests (NITs): APRI, Fibrosis-4 and Delta-4 fibrosis scores. Histologic fibrosis stage distribution was: 20.4% for F0-F1; 27.0% for F2; 18.7% for F3 and 33.9% for F4. TE demonstrated good diagnostic performance for detecting cirrhosis and advanced fibrosis with AUROC of 0.88 and 0.86, values, which were significantly higher than those obtained with the other NITs (P = .004 and P < .001). With a cutoff value >12 kPa for cirrhosis, sensitivity was 70.5%, specificity 86.2%, positive predictive value (PPV) 72.4% negative predictive value (NPV) 85.1% and accuracy 80.9%. Using 10.4 kPa as cut-off value for F3, sensitivity was 70.2%, specificity 83.5%, PPV 82.5%, NPV 71.7% and accuracy 76.5%. In 89% of patients with LSM ≤ 6.2 kPa, liver biopsy disclosed only absent or minimal fibrosis. TE demonstrated good diagnostic performance for advanced fibrosis and cirrhosis in CHD patients. Advanced fibrosis is highly probable for LSM values ≥10 kPa. LSM values < 6 kPa almost totally exclude significant fibrosis. Between 6 and 10 kPa, liver biopsy should be discussed.