JOURNAL ARTICLE
RESEARCH SUPPORT, NON-U.S. GOV'T
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Non-invasive algorithm of enhanced liver fibrosis and liver stiffness measurement with transient elastography for advanced liver fibrosis in chronic hepatitis B.

BACKGROUND: The accuracy of Enhanced Liver Fibrosis (ELF; ADVIA Centaur, Siemens Healthcare Diagnostics, Tarrytown, NY, USA) in assessing liver fibrosis in chronic hepatitis B (CHB) is to be determined.

AIM: To derive and validate a combined ELF-liver stiffness measurement (LSM) algorithm to predict advanced fibrosis in CHB patients.

METHODS: Using the data of a previously reported cohort of 238 CHB patients, an ALT-based LSM algorithm for liver fibrosis was used as a training cohort to evaluate the performance of ELF against liver histology. The best combined ELF-LSM algorithm was then validated in new cohort of 85 CHB patients not previously reported.

RESULTS: In the training cohort, LSM has better performance of diagnosing advanced (≥F3) fibrosis (area under the receiver operating characteristics curve [AUROC] 0.83, 95% confidence interval [CI 0.76-0.91] than ELF (AUROC 0.69, 95% CI 0.63-0.75). The optimal cut-off values of ELF were 8.4 to exclude advanced fibrosis, and 10.8 to confirm advanced fibrosis. In the training cohort, an ELF ≤ 8.4 had a sensitivity of 95% to exclude advanced fibrosis; an ELF > 10.8 had a specificity of 92% to confirm advanced fibrosis. In the combined algorithm, low ELF or low LSM could be used to exclude advanced fibrosis as both of them had high sensitivity (≥90%). To confirm advanced fibrosis, agreement between high ELF and high LSM could improve the negative predictive value specificity (from 65% and 74% to 80%).

CONCLUSIONS: An Enhanced Liver Fibrosis - liver stiffness measurement algorithm could improve the accuracy of prediction of either ELF or LSM alone. Liver biopsy could be correctly avoided in approximately 60% of patients.

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