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96 weeks treatment of tenofovir alafenamide vs. tenofovir disoproxil fumarate for hepatitis B virus infection
Author links open overlay panelKoshAgarwal1MauriziaBrunetto2Wai KaySeto3Young-SukLim4ScottFung5PatrickMarcellin6Sang HoonAhn7NamikiIzumi8Wan–LongChuang9HoBae10ManojSharma11Harry L.A.Janssen1213Calvin Q.Pan14Mustafa KemalÇelen15NorihiroFurusyo16Dr.Shalimar17Ki TaeYoon18HuyTrinh19John F.Flaherty20AnujGaggar20Audrey H.Lau20Andrea L.Cathcart20LanjiaLin20NeeruBhardwaj20VithikaSuri20G.Mani Subramanian20Edward J.Gane21MariaButi22Henry L.Y.Chan23and the
GS-US-320-0110
Author links open overlay paneland
GS-US-320-0108 Investigators
1
Kings College Hospital, London, United Kingdom
2
University of Pisa, Pisa, Italy
3
University of Hong Kong, Hong Kong
4
Asan Medical Center, University of Ulsan College of Medicine, Seoul, South Korea
5
Toronto General Hospital, Toronto, ON, Canada
6
Hôpital Beaujon, Clichy, France
7
Yonsei University, Seoul, South Korea
8
Musashino Red Cross Hospital, Tokyo, Japan
9
Kaohsiung Medical University Hospital, Kaohsiung Medical University, Kaohsiung, Taiwan
10
Asian Pacific Liver Center, St. Vincent Medical Center, Los Angeles, USA
11
Institute of Liver and Biliary Sciences, New Delhi, India
12
Toronto Western Hospital, Toronto, ON, Canada
13
Erasmus Medical Center, Rotterdam, The Netherlands
14
NYU Langone Medical Center, NYU School of Medicine, New York, USA
15
Dicle University Hospital Infectious Diseases, Diyarbakir, Turkey
16
Kyushu University Hospital, Fukuoka, Japan
17
All India Institute of Medical Sciences, New Delhi, Delhi, India
18
Pusan National University Yangsan Hospital, Yangsan, South Korea
19
San Jose Gastroenterology, San Jose, USA
20
Gilead Sciences, Foster City, CA, USA
21
Auckland Clinical Studies, Auckland, New Zealand
22
Hospital Universitario Valle Hebron, Barcelona, Spain
23
The Chinese University of Hong Kong, Hong Kong
Received 3 August 2017, Revised 13 October 2017, Accepted 12 November 2017, Available online 17 January 2018.
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https://doi.org/10.1016/j.jhep.2017.11.039
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Highlights
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TAF is a new prodrug of tenofovir developed to treat patients with chronic HBV.
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A lower dose of TAF can be used because it delivers tenofovir more efficiently to hepatocytes than TDF.
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At week 48, TAF had non-inferior efficacy to TDF with improved renal and bone safety.
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Efficacy and safety results at week 96 confirm the 48-week results in both studies.
Background & Aims
Tenofovir alafenamide (TAF) is a new prodrug of tenofovir developed to treat patients with chronic hepatitis B virus (HBV) infection at a lower dose than tenofovir disoproxil fumarate (TDF) through more efficient delivery of tenofovir to hepatocytes. In 48-week results from two ongoing, double-blind, randomized phase III trials, TAF was non-inferior to TDF in efficacy with improved renal and bone safety. We report 96-week outcomes for both trials.
Methods
In two international trials, patients with chronic HBV infection were randomized 2:1 to receive 25 mg TAF or 300 mg TDF in a double-blinded fashion. One study enrolled HBeAg-positive patients and the other HBeAg-negative patients. We assessed efficacy in each study, and safety in the pooled population.
Results
At week 96, the differences in the rates of viral suppression were similar in HBeAg-positive patients receiving TAF and TDF (73% vs. 75%, respectively, adjusted difference −2.2% (95% CI −8.3 to 3.9%; p = 0.47), and in HBeAg-negative patients receiving TAF and TDF (90% vs. 91%, respectively, adjusted difference −0.6% (95% CI −7.0 to 5.8%; p = 0.84). In both studies the proportions of patients with alanine aminotransferase above the upper limit of normal at baseline, who had normal alanine aminotransferase at week 96 of treatment, were significantly higher in patients receiving TAF than in those receiving TDF. In the pooled safety population, patients receiving TAF had significantly smaller decreases in bone mineral density than those receiving TDF in the hip (mean % change −0.33% vs. −2.51%; p <0.001) and lumbar spine (mean % change −0.75% vs. −2.57%; p <0.001), as well as a significantly smaller median change in estimated glomerular filtration rate by Cockcroft-Gault method (−1.2 vs. −4.8 mg/dl; p <0.001).
Conclusion
In patients with HBV infection, TAF remained as effective as TDF, with continued improved renal and bone safety, two years after the initiation of treatment. Clinicaltrials.gov number: NCT01940471 and NCT01940341.
Lay summary
At week 96 of two ongoing studies comparing the efficacy and safety of tenofovir alafenamide (TAF) to tenofovir disoproxil fumarate (TDF) for the treatment of chronic hepatitis B patients, TAF continues to be as effective as TDF with continued improved renal and bone safety.
Registration: Clinicaltrials.gov number: NCT01940471 and NCT01940
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