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Impact of switching to tenofovir alafenamide fumarate in patients with entecavir-treated chronic hepatitis B
Takashi Kumada 1 , Hidenori Toyoda 2 , Satoshi Yasuda 2 , Takanori Ito 3 , Junko Tanaka 4
Affiliations
Affiliations
1
Department of Nursing, Faculty of Nursing, Gifu Kyoritsu University.
2
Department of Gastroenterology and Hepatology, Ogaki Municipal Hospital, Ogaki, Gifu.
3
Department of Gastroenterology and Hepatology, Nagoya University Graduate School of Medicine, Nagoya.
4
Department of Epidemiology, Infectious Disease Control, and Prevention, Hiroshima University Institute of Biomedical and Health Sciences, Hiroshima, Japan.
PMID: 35048656 DOI: 10.1097/MEG.0000000000002292
Abstract
Background and aims: Tenofovir alafenamide (TAF), a new tenofovir prodrug, has been developed to circumvent the less favorable safety profile of tenofovir disoproxil fumarate (TDF). We investigated reductions in hepatitis B surface antigen (HBsAg) levels in patients with HBV infection who received continuous entecavir (ETV) monotherapy or sequential therapy with ETV and TAF.
Methods: This retrospective cohort study included 286 patients who were divided into two groups: continuous ETV monotherapy (ETV group, n = 168) and sequential therapy with ETV and TAF (ETV-TAF group, n = 108). Factors associated with a 90% reduction in HBsAg levels were analyzed by a Cox proportional hazards model using a time-dependent covariate in both groups.
Results: In the multivariate Cox proportional hazards model, the ETV-TAF group [adjusted hazard ratio (aHR) 2.750; 95% confidence interval (CI), 1.265-3.405; P = 0.0038] and BMI ≤ 25.0 kg/m2 (aHR 0.520, 95% CI, 0.308-0.875; P = 0.0139) demonstrated a 90% reduction in HBsAg levels. HBsAg levels of patients in the TAF phase in the ETV-TAF group showed greater yearly percent reductions than those in the ETV group and those in the ETV phase in the ETV-TAF group (P = 0.0361 and P = 0.0022, respectively, Steel-Dwass test).
Conclusion: HBsAg levels decreased more rapidly after patients switched from ETV to TAF. Switching to TAF may be an effective treatment option to reduce HBsAg levels.
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