Original Article
Open Access
Jinlin Hou, Qin Ning, Zhongping Duan, Yu Chen, Qing Xie, Lunli Zhang, Shanming Wu, Hong Tang, Jun Li, Feng Lin, Yongfeng Yang, Guozhong Gong, Yanwen Luo, Yan Chen, Frida Abramov, Leland J. Yee, Hongyuan Wang, Roberto Mateo, Tahmineh Yazdi, Irina Botros, Chengwei Chen, Yan Huang, Mingxiang Zhang, Jidong Jia
Published online February 4, 2026
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Journal of Clinical and Translational Hepatology.
doi:10.14218/JCTH.2025.00438
Abstract
Tenofovir alafenamide (TAF) has demonstrated comparable efficacy to tenofovir disoproxil fumarate (TDF), with improved renal and bone safety, in Chinese participants with chronic
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Tenofovir alafenamide (TAF) has demonstrated comparable efficacy to tenofovir disoproxil fumarate (TDF), with improved renal and bone safety, in Chinese participants with chronic hepatitis B enrolled in two Phase 3 trials. This study aimed to evaluate the long-term virologic efficacy, serological and biochemical responses, resistance, and renal and bone safety of TAF over eight years in this population.
Participants completing the three-year double-blind phase were eligible to receive open-label TAF 25 mg/day for up to an additional five years (totaling eight years). Analyses of viral suppression (HBV DNA < 29 IU/mL), alanine aminotransferase normalization, serological responses, resistance surveillance, and safety outcomes were conducted.
Among 334 enrolled participants, 212 of 227 participants randomized to TAF continued open-label TAF (TAF-TAF), and 99 of 107 participants on TDF switched to open-label TAF (TDF-TAF). At Year 8, 79.3% (180/227) and 78.5% (84/107) of participants in the TAF-TAF and TDF-TAF groups, respectively, achieved viral suppression (missing = failure); rates increased to 95.2% (180/189) and 95.5% (84/88) when excluding missing data. Alanine aminotransferase normalization rates remained high and comparable between groups. Serologic response rates continued to increase over time, with higher rates observed in the TAF-TAF group. Estimated glomerular filtration rate (by Cockcroft-Gault) and hip/spine bone mineral density remained stable in the TAF-TAF group through eight years; the small declines in these renal and bone parameters observed during double-blind TDF treatment improved after switching to open-label TAF. No resistance to TAF was detected.
Long-term TAF treatment demonstrated durable virologic efficacy, sustained biochemical and serological responses, and favorable renal and bone safety over eight years in Chinese participants with chronic hepatitis B.
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