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Efficacy of tenofovir switch therapy for nucleos(t)ide-experienced patients with chronic hepatitis B
A. O.-S. Lo1,2,3, V. W.-S. Wong1,2,3, G. L.-H. Wong1,2,3, Y.-K. Tse1,2,3, H.-Y. Chan1,2,3 andH. L.-Y. Chan1,2,3,*
Article first published online: 31 MAR 2015
DOI: 10.1111/apt.13185
© 2015 John Wiley & Sons Ltd
Issue
Volume 41, Issue 11, pages 1190–1199, June 2015
Article has an altmetric score of 4
1 Department of Medicine and Therapeutics, The Chinese University of Hong Kong, Hong Kong
2 Institute of Digestive Disease, The Chinese University of Hong Kong, Hong Kong
3 State Key Laboratory of Digestive Disease, The Chinese University of Hong Kong, Hong Kong
* Correspondence to:
Prof. H. L.-Y. Chan, Department of Medicine and Therapeutics, 9/F, Lui Che Woo Clinical Science Building, Prince of Wales Hospital, 30-32 Ngan Shing Street, Shatin, Hong Kong.
E-mail: [email protected]
This article was accepted for publication after full peer-review.
Summary
Background
Tenofovir disoproxil fumarate has been used in chronic hepatitis B patients with suboptimal virologic response to nucleos(t)ide analogues. The efficacy of tenofovir switch therapy has not been well studied in Asian patients.
Aim
To evaluate the efficacy of tenofovir switch therapy in nucleos(t)ide-experienced patients, and identify the factors associated with treatment response of tenofovir switch therapy.
Methods
Nucleos(t)ide-experienced hepatitis B e antigen-positive and -negative patients prescribed with tenofovir were retrospectively identified and recruited for prospective analysis. Hepatitis B virus (HBV) DNA and other biochemical parameters were monitored in regular 3–6 monthly follow-up visits. Primary efficacy endpoint was maintained-virologic response with tenofovir switch therapy, defined as undetectable HBV DNA (<20 IU/mL) until the last follow-up visit.
Results
An overall of 214/252 (84.9%) patients achieved maintained-virologic response after 22 (7–55) months of tenofovir switch therapy. On multivariate analysis, a lower HBV DNA level at the time of switching to tenofovir was an independent factor associated with treatment efficacy. Maintained-virologic response after switching to tenofovir was achieved in 177/190 (93.2%) patients with HBV DNA <20 000 IU/mL vs. 37/62 (59.7%) patients with HBV DNA ≥20 000 IU/mL (P < 0.001). Absence of genotypic resistance to lamivudine or adefovir dipivoxil was not associated with improved treatment outcome.
Conclusions
Tenofovir switch therapy is an effective treatment strategy in nucleos(t)ide-experienced chronic hepatitis B patients. However, in patients with HBV DNA ≥20 000 IU/mL at the time of switching to tenofovir, the chance of achieving maintained undetectable HBV DNA is significantly reduced.
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