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      • Improved Bone and Renal Safety of Switching from Tenofovir Disoproxil Fumarate (TDF) to Tenofovir Alafenamide (TAF) in CHB Patients

        ( Young Suk Lim ),( Henry L. Chan ),( Scott Fung ),( Wai Kay Seto ),( Ed Gane ),( John F. Flaherty ),( Vithika Suri ),( Lanjia Lin ),( Anuj Gaggar ),( G Mani Subramanian ),( Wan Long Chuang ),( Kosh A 대한간학회 2017 춘·추계 학술대회 (KASL) Vol.2017 No.1

        Aims: TAF has shown less bone and renal effects with similar efficacy rates compared to TDF in two Phase 3 studies after 48 weeks treatment. Here, we evaluate patients completed 96 weeks of double blind(DB) treatment with TAF or TDF and have switched to open label(OL) treatment with TAF to determine changes in bone mineral density(BMD), creatinine clearance(CrCl), and the maintenance of viral suppression. Methods: Immune active CHB patients who were HBeAg negative (Study 0108; N=425) or HBeAg positive (Study 0110; N=873) were randomized to and treated with TAF 25 mg QD or TDF 300 mg QD. A subset of patients (N=200 in Study 0108 and N=340 in Study 0110) in these ongoing 8 year studies had completed 96 weeks of DB treatment with TAF or TDF and switched to OLTAF at Week 96 analysis. Dual energy X-ray absorptiometry (DXA) scans were evaluated every 24 weeks as were serial assessments of CrCl and viral suppression. Results: CrCl improved significantly in patients switched from DB TDF to OL TAF at Week 120 compared to Week 96 (N=117, mean (SD) change=+2.43 (12.81) ml/min, p=0.04); and remained stable in those previously receiving TAF (Figure A). BMD also showed improvement at Week 120 from Week 96 among patients switched from DB TDF to OL TAF (hip: N=58, mean (SD) % change=+0.71% (1.43), p=0.0004; spine: N=60, mean (SD) % change=+1.41% (2.30), p<.0001). BMD changes in hip and spine for DB TAF patients entering the OL TAF period were relatively stable (Figure B). Compared to results at Week 96, high rates of virologic control were maintained across subjects in both studies during the OL period. Conclusions: Patients who switched from TDF to TAF treatment demonstrated rapid improvements in BMD and CrCl within the first 24 weeks of treatment, and virologic control was maintained.

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