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* * * * * * * * * * * * * * * * * Patient 2068 stopped LAM on 17-Sep-01 (Week 28). Lamivudine was added to ADV on 24-Dec-02 (Week96). * N236T mutant HBV displays reduced susceptibility to adefovir but remains susceptible to lamivudine in vitro A181V mutant HBV confers 2 to 3-fold reduced susceptibility to adefovir. The clinical relevant cut-off value will be further evaluated. * N236T mutant HBV displays reduced susceptibility to adefovir but remains susceptible to lamivudine in vitro A181V mutant HBV confers 2 to 3-fold reduced susceptibility to adefovir. The clinical relevant cut-off value will be further evaluated. * * * * * * * See my next slide. It may be useful in consolidating the information in this slide and the one after next. * * 研究设计 Study GS-98-435 开放研究, ADV 10 mg /天用于拉米夫定治疗失败并进行肝移植的慢性乙肝病人 98% 的病人基线时有 YMDD变异 大部分病人继续拉米夫定治疗 48周时没有发现阿德福韦耐药1 共有114名病人随访至96周 1. Westland et al. Therapies for Viral Hepatitis, 2002 Patients Included for Evaluation *Attributable to low serum HBV DNA 随访96周的病人 n = 114 96周时PCR (? 1000 c/mL) 检测到HBV DNA n = 34 96周时 HBV DNA 1000 c/mL n = 80 (70%) Genotyped n = 33 PCR failure* n = 1 Results 2名病人出现rtN236T 变异 (1.8%, 2/114) 2人均接受ADV单药治疗并在出现rtN236T变异之前 YMDD变异消失 1人出现 ALT 波动 加用LAM后DNA明显下降 出现rtN236T 变异的A病人血清HBV DNA水平 rtN236T at wk96 Serum HBV DNA (Log10 copies/mL) ADV ALT (IU/L) 500 400 300 200 100 0 rtL180M + rtM204V LAM ALT DNA Wild-type in YMDD LAM 出现rtN236T 变异的B病人血清HBV DNA水平 rtN236T at wk76 Serum HBV DNA (Log10 copies/mL) ADV 10 mg ALT (IU/L) 500 400 300 200 100 0 Wild-type in YMDD rtL180M + rtM204V LAM ALT DNA LAM In Vitro Drug Susceptibility Less susceptible than wild-type rtN236T demonstrated ~ 4-fold reduced susceptibility to adefovir but remained susceptible to lamivudine in vitro Consistent with data obtained from a different assay in Huh7 cells1 1. Zoulim et al. EASL 2003 In Vitro Cross-Resistance rtN236T remained susceptible to entecavir and emtricitabine in vitro 1. Ono et al. J
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