Lower Incidence of Hepatocellular Carcinoma with Tenofovir Alafenamide in Chronic Hepatitis B: Evidence from a Large-Scale Cohort

Abstract

Background & AimsThe newer tenofovir alafenamide (TAF) lacks extensive research regarding its impact on hepatocellular carcinoma (HCC). This study aims to evaluate and compare the effects of TAF, tenofovir disoproxil fumarate (TDF), and entecavir (ETV) on HCC incidence using nationwide claim data. MethodsA total of 75,816 treatment-naïve chronic hepatitis B patients were included and divided into TAF (n=25,680), TDF (n=26,954), and ETV (n=23,182) groups after exclusions. Propensity score matching (1:1:1) resulted in 17,537 patients per group, and HCC incidence rates were compared. ResultsBefore matching, the incidence of HCC was significantly lower in the TAF group compared to the TDF and ETV groups (11.47 vs. 15.04 and 14.24 per 1,000 person-years). The incidence rate ratio for TDF was 1.31 (1.19-1.44) and for ETV was 1.24 (1.12-1.37). Before matching, the TAF group had a significantly lower HCC compared to TDF and ETV in both cirrhotic and non-cirrhotic patients. After matching, the TAF group had a lower HCC incidence compared to TDF (12.38 vs. 15.39, incidence rate ratio 1.24, p<0.001) but not ETV (incidence rate ratio 1.08, p=0.219). In cirrhotic patients, TAF had lower HCC incidence than TDF and ETV (30.25 vs. 39.56 and 38.51). In non-cirrhotic patients, TAF had lower HCC incidence than TDF (incidence rate ratio 1.19, p=0.030) but not ETV (incidence rate ratio 0.85, p=0.066). Cox regression analysis showed TAF had a significantly lower HCC incidence compared to TDF (hazard ratio 1.335, p<0.001) and ETV (hazard ratio 1.162, p=0.011), after adjusting for age, gender, and cirrhosis status. ConclusionsThe TAF group consistently demonstrated a lower incidence of HCC compared to the TDF and ETV groups, especially in patients with cirrhosis. IMPACT and IMPLICATIONSThe scientific justification for this work lies in its potential to fill the knowledge gap regarding the comparative efficacy of Tenofovir Alafenamide (TAF), Tenofovir Disoproxil Fumarate (TDF), and Entecavir (ETV) in reducing the incidence of hepatocellular carcinoma (HCC) in chronic hepatitis B patients. The study's findings are particularly crucial for healthcare providers and policymakers, as they highlight the significantly lower incidence of HCC associated with TAF, especially in patients with cirrhosis. These results suggest that TAF could be a preferable antiviral therapy option to mitigate HCC risk, thus influencing clinical decision-making and healthcare guidelines. Practically, these findings can guide physicians in prescribing more effective treatments, assist researchers in designing further studies to explore the mechanisms behind TAF's effectiveness, and inform policymakers in crafting healthcare policies that optimize patient outcomes while considering potential limitations such as the observational nature of the study and residual confounding factors.