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EASL 2018 PS-156
Safety and efficacy at 1 year after switching from Tenofovir
Disoproxil Fumurate to Tenofovir Alafenamide in chronic HBV
patients with risk factors for TDF use
E. Gane1, W.-K. Seto2, H. Janssen3, F.A. Caruntu4, H.J. Kim5,
D. Abdurakhmanov6, S. Nishiguchi7, H. Andrzej8, H. Bae9, S. Mo10,
V. Suri10, A. Gaggar10, J.F. Flaherty10, J.-H. Kao11, M. Brunetto12,
M.B. Ferret13. 1Auckland Clinical Studies, Auckland, New Zealand;
2Queen Mary Hospital, Hong Kong, Hong Kong; 3Toronto General
Hospital, Toronto, ON, Canada; 4Infectious Diseases, National Institute
for Infectious Diseases Matei Bals, Bucharest, Romania; 5Chung-Ang
Hospital, Seoul, Korea; 6Sechenov First Moscow State Medical University,
Moscow, Russia; 7Hyogo College of Medicine Hospital, Hyogo, Japan;
8SP ZOZ Wojewodzki Szpital Zakazny w Warszawie, Warsaw, Poland;
9Asian Pacific Liver Center, Los Angeles, California, United States;
10Gilead Sciences, Inc., Foster City, CA, USA; 11National Taiwan University,
Taipei, Taiwan; 12UO Epatologia, Azienda Ospedaliera Universitaria
Pisana, Pisa, Italy; 13Hospital Universitari Vall d’Hebron,
Barcelona, Spain
Email: [email protected]
Background and Aims: In Phase 3 studies in chronic hepatitis B
(CHB) patients, tenofovir alafenamide (TAF), a new tenofovir (TFV)
prodrug, has shown noninferior efficacy to tenofovir disoproxil
fumarate (TDF) at Weeks 48 and 96, with superior bone and renal
safety. TAF is a preferred treatment in the 2017 EASL HBV Guidelines,
especially in patients with risk factors for TDF-associated renal
and bone effects. We assessed the 1 year safety and efficacy in
CHB patients with TDF risk factors (RF) whowere switched from TDF
to TAF.
Method: In 2 identically-designed studies, HBeAg-positive and
-negative patients were randomized 2:1 to TAF 25 mg or TDF
300 mg QD and treated in a double-blind fashion for 96 weeks,
after which patients received open-label (OL) TAF. Renal (serum
creatinine [sCr], eGFR by Cockcroft-Gault [eGFRCG] and urine
biomarkers of tubular function) and bone (serial DXA scans at hip/
spine and serum bone biomarkers) safety parameters, antiviral
efficacy (HBV DNA < 29 IU/ml), and ALT normalizationwere assessed
in the subset of switched patients having baseline RF for TDF: Age >
60 yr, osteoporosis of hip/spine, ≥Stage 2 chronic kidney disease
(CKD), albuminurina (UACR > 30mg/g), hypophosphatemia (PO4
<2.5 mg/dl), or comorbidities associated with CKD (e.g. HTN, DM,
obesity).
Results: Of 1,298 patients randomized and treated, 540 switched to
OLTAF atWeek 96 (TAF→TAF in 360; TDF→TAF in 180), of whom 284
(53%) had ≥1 TDF RF; 123 (23%) patients had ≥2 RF. Baseline
demographics were similar between groups. Renal and bone safety
results at Week 144 are summarized in the table. At Week 144, TDF
patients switched toTAF showed improvements in renal (sCr, eGFRCG)
parameters with a higher percentage of patients showing improvement
vs worsening of CKD stage. Improvements in hip and spine
BMD were seen at 1 year following switch. Patients continuing
TAF showed similar small changes in renal/bone parameters.
Antiviral efficacy was maintained in both groups and TDF patients
switching to TAF atWeek 96 had increased rates of ALT normalization
at Week 144.
Table: Renal and bone safety results at Week 144 in CHB patients with
TDF risk factors switched from TDF to TAF at Week 96
Change from Open-label (Week 96) baseline: TDF→TAF (n = 101) p valuea Renal parameters
Serum creatinine, mean (SD) change (mg/dl) −0.018 (0.064) 0.008
eGFRCG, median (Q1, Q3) change (ml/min) +3.0 (−1.8, 7.8) <0.001
≥1 stage improvement in CKD stage from
Week 96 (OL baseline) to Week 144, n/N (%)
9/51 (18) NDb
≥1 stage worsening in CKD stage fromWeek 96
(OL baseline) to Week 144, n/N (%)
4/95 (4) ND
Bone parameters
Hip BMD, mean (SD) % change +0.97 (2.88) 0.002
Spine BMD, mean (SD) % change +2.18 (3.36) <0.001
ap values from T test; bND is testing not done.
Conclusion: CHB patients with risk factors for TDF toxicity who are
switched from TDF to TAF have improved bone and renal safety and
normalization of ALT levels whilst efficacy was maintained in this
subgroup at one year.
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