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Long Term Treatment with Tenofovir Disoproxil Fuma- rate for Chronic Hepatitis B Infection is Safe and Well Tolerated and Associated with Durable Virologic Response with no Detectable Resistance: 8 Year Results from Two Phase 3 Trials
Patrick Marcellin1, Edward J. Gane2, Robert Flisiak3, Huy N. Trinh4, Joerg Petersen5, Selim Gurel6, Kelly D. Kaita7, Iskren A. Kotzev8, Naoky Tsai9, John F. Flaherty10, Raul E. Aguilar Schall10, Kathryn M. Kitrinos10, Mani Subramanian10, John G. McHutchi- son10, Jacob George11, Harry L. Janssen12, Maria Buti13; 1Hopital Beaujon, Clichy, France; 2Auckland City Hospital, Auckland, New Zealand; 3Medical University of Bialystok, Bialystok, Poland; 4San Jose Gastroenterology, San Jose, CA; 5Asklepiosklinik St. Georg, University of Hamburg, Hamburg, Germany; 6Uludag Universitesi Tip Fakultesi, Bursa, Turkey; 7University of Manitoba, Winnipeg, MB, Canada; 8University Hospital Sveta Marina, Varna, Bulgaria; 9Queens Medical Center, University of Hawaii, Honolulu, HI; 10Gilead Sciences, Foster City, CA; 11Storr Liver Unit, Westmead Millennium Institute, Westmead Hospital, Sydney, NSW, Australia; 12University of Toronto, Toronto, ON, Canada; 13Universitari Vall d’Hebron and Ciberehd, Barcelona, Spain
Background: Through 5 years of treatment with tenofovir diso- proxil fumarate (TDF) in mostly naïve patients, we reported sustained viral suppression with regression of fibrosis, and reversal of cirrhosis in 74% of patients (Lancet 2013;381:468- 75). Further, no evidence of resistance to TDF was seen through Year 6 (J Hepatol. 2014;59:434-42). Here we present Year 8 results, the initially pre-specified end of study period, for two Phase 3 studies in HBeAg- and HBeAg+ chronic hepatitis B patients. Methods: After 48 weeks of double-blind comparison of TDF to adefovir dipivoxil, all patients were eligible to con- tinue open-label TDF. Patients were assessed every 3 months for efficacy and safety; resistance surveillance was performed annually, and annual bone mineral density (BMD) assessments by DXA were included starting at Year 4. Results: A total of 641 patients were randomized and treated; 585 (91%) entered the TDF extension phase at Year 1, and 412 (64%) remained on study at Year 8. Efficacy results are summarized in the table. Durable viral suppression was maintained, and 7 additional patients (5 HBeAg+ and 2 HBeAg- ) experienced loss of HBsAg (5 patients with seroconversion to anti-HBs) between Years 5-8. No resistance to TDF was detected through Year 8. Through Year 8, a confirmed renal event (either ≥0.5 mg/dL increase in serum creatinine, or serum phosphorus <2 mg/dL, or creatinine clearance <50 mL/min) was observed in 2.2% of patients, and BMD (T scores) of hip and spine were stable between Years 4-8.
Tags: tenofovir, aasld
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