Distinct Relapse Rates and Risk Predictors After Discontinuing Tenofovir and Entecavir Therapy.

BACKGROUND

We investigated the patterns and predictors for virological relapse (VR), clinical relapse (CR), and sustained clinical response (SCR) and the outcomes of retreatment after nucleos(t)ide analogue (NUC) therapy discontinuation.

METHODS

Patients with chronic hepatitis B who were discontinuing NUC therapy were prospectively enrolled. Viral and host predictors of relapse were evaluated, including hepatitis B virus (HBV) surface antigen (HBsAg) level, anti-HBV core antibody level, and presence of single-nucleotide polymorphisms in the genes encoding the receptors NTCP (rs2296651) and CTLA4 (rs231775) and in the 3' untranslated regions of the genes encoding HLA-DPA1 (rs3077) and HLA-DPB1 (rs9277535); posttherapy predictors of relapse were also investigated. Information about NUC retreatment and outcomes were recorded.

RESULTS

Overall, 100 patients discontinuing 3-year entecavir (ETV) or tenofovir (TDF) therapy were enrolled. Patients discontinuing TDF exhibited significantly higher rates of VR (52.9% vs 6.1%; P < .001) and CR (15.2% vs. 1.5%, P = .007) at 3 months than those discontinuing ETV, but relapse rates at 12 months were comparable. The end-of-therapy HBsAg levels predicted VR (hazard ratio [HR], 1.62; 95% confidence interval [CI], 1.19-2.21), CR (HR, 1.78; 95% CI, 1.13-2.81), and SCR (OR, 0.57; 95% CI, .35-.94). The CTLA4 (rs231775) non-GG genotype predicted VR (HR, 1.74; 95% CI, 1.01-3.00) and CR (HR, 2.06; 95% CI, 1.04-4.11), while the HLA-DPA1 (rs3077) AA genotype predicted SCR (OR, 10.84; 95% CI, 1.12-105). The HBV DNA 1 month after NUC treatment cessation was an early predictor of subsequent relapse.

CONCLUSIONS

Discontinuation of tenofovir disoproxil fumarate treatment rather than entecavir treatment is associated with earlier relapse, and NUC-specific posttherapy monitoring is necessary.