Dynamic Evaluation of Liver Fibrosis to Assess the Risk of Hepatocellular Carcinoma in Patients With Chronic Hepatitis C Who Achieved Sustained Virologic Response

Background. Liver fibrosis is an important risk factor for the development of hepatocellular carcinoma (HCC) after sustained virologic response (SVR) in patients with persistent hepatitis C virus (HCV) infection. However, as the degree of liver fibrosis changes following the eradication of HCV after SVR, it is unclear whether the prediction of HCC development based on liver fibrosis at baseline remains valid. Methods. In 522 patients who achieved SVR by interferon-based anti-HCV therapy, the Fibrosis-4 Index for Liver Fibrosis (FIB-4 index) was updated annually by recalculation based on laboratory values after SVR. The incidence of HCC was reassessed annually based on the updated FIB-4 index. Results. The percentage of patients with mild liver fibrosis (FIB-4 index <1.45) increased annually after SVR, whereas the percentage of patients with advanced liver fibrosis (FIB-4 index >= 3.25) decreased. The incidences of HCC based on the FIB-4 index remained constant between the time of SVR and subsequent annual updates. No patients developed HCC after SVR if the FIB-4 index decreased to <1.45. Conclusions. The FIB-4 index retained its predictive ability for the risk of HCC when recalculated after SVR, despite the decrease in patients with high FIB-4 index values. Dynamic assessment of the FIB-4 index can be useful in the surveillance of HCC after SVR. Patients with a FIB-4 index <1.45 did not develop HCC even by the regression from advanced fibrosis after SVR. Further studies will be necessary to confirm these findings, which may result in a decrease in the number of patients in whom surveillance is required.