E.1 Medical condition or disease under investigation |
E.1.1 | Medical condition(s) being investigated |
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MedDRA Classification |
E.1.2 Medical condition or disease under investigation |
E.1.2 | Version | 9.1 |
E.1.2 | Level | LLT |
E.1.2 | Classification code | 10008910 |
E.1.2 | Term | Chronic hepatitis B |
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E.1.3 | Condition being studied is a rare disease | No |
E.2 Objective of the trial |
E.2.1 | Main objective of the trial |
• To compare the antiviral efficacy against hepatitis B virus (HBV) of once-daily tenofovir DF versus once-daily emtricitabine plus tenofovir DF combination treatment in subjects with lamivudine resistance |
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E.2.2 | Secondary objectives of the trial |
• To evaluate the safety and tolerability of tenofovir DF versus emtricitabine plus tenofovir DF combination treatment in subjects with lamivudine resistance • To evaluate the biochemical and serological responses to tenofovir DF versus emtricitabine plus tenofovir DF in subjects with lamivudine resistance • To compare changes in the resistance profile of each treatment arm over the duration of the study • To evaluate the steady-state pharmacokinetics of tenofovir in subjects with lamivudine resistance
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E.2.3 | Trial contains a sub-study | Yes |
E.2.3.1 | Full title, date and version of each sub-study and their related objectives |
Pharmacokinetic (PK) substudy objective:
• To evaluate the pharmacokinetics of tenofovir in subjects with calculated creatinine clearance (CLcr) 50–80 mL/min
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E.3 | Principal inclusion criteria |
• Chronic HBV infection, defined as positive serum HBsAg for at least 6 months • 18 through 75 years of age, inclusive • HBV DNA ≥ 10^4 copies/mL • Currently receiving lamivudine with confirmation of HBV reverse transcriptase mutation(s) known to confer resistance to lamivudine (rtM204I/V with or without rtL180M) by central laboratory assessment prior to randomization. Adefovir dipivoxil treatment of ≤ 48 weeks at the time of screening (inclusive of combination adefovir dipivoxil + lamivudine at entry) is allowed • Willing and able to provide written informed consent • Negative serum β-HCG (for females of childbearing potential only) • Calculated creatinine clearance ≥ 50 mL/min • Hemoglobin ≥ 10 g/dL • Neutrophils ≥ 1,500 /mm3 • No prior oral HBV therapy with approved nucleotide and/or nucleoside therapy or other investigational agents for HBV infection other than lamivudine or adefovir dipivoxil.
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E.4 | Principal exclusion criteria |
• Pregnant women, women who are breast feeding or who believe they may wish to become pregnant during the course of the study. • Males and females of reproductive potential who are not willing to use an “effective” method of contraception during the study. For males, condoms should be used and for females, a barrier contraception method should be used in combination with one other form of contraception. • ALT ≥ 10 × ULN • Decompensated liver disease defined as direct (conjugated) bilirubin > 1.2 x ULN, prothrombin time (PT) > 1.2 x ULN, platelets < 150,000/mm3, serum albumin < 3.5 g/dL, or prior history of clinical hepatic decompensation (e.g., ascites, jaundice, encephalopathy, variceal hemorrhage). • Received interferon (pegylated or not) therapy within 6 months of the screening visit • α -fetoprotein > 50 ng/mL • Evidence of HCC • Co infection with HCV (by serology), HIV, or HDV • Significant renal, cardiovascular, pulmonary, or neurological disease • Received solid organ or bone marrow transplantation • Is currently receiving therapy with immunomodulators (e.g., corticosteroids, etc.), investigational agents, nephrotoxic agents, or agents susceptible of modifying renal excretion • Has proximal tubulopathy • Known hypersensitivity to the study drugs, the metabolites or formulation excipients
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E.5 End points |
E.5.1 | Primary end point(s) |
The primary endpoint is HBV DNA < 400 copies/mL at Week 48 (and every 48 weeks thereafter, due to group sequential testing for the primary efficacy analysis).
A “persistent virologic response” approach to handling missing data will be employed; the details of this convention will be included in a separate statistical analysis plan
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E.6 and E.7 Scope of the trial |
E.6 | Scope of the trial |
E.6.1 | Diagnosis | Information not present in EudraCT |
E.6.2 | Prophylaxis | Information not present in EudraCT |
E.6.3 | Therapy | Yes |
E.6.4 | Safety | Yes |
E.6.5 | Efficacy | Yes |
E.6.6 | Pharmacokinetic | Yes |
E.6.7 | Pharmacodynamic | Information not present in EudraCT |
E.6.8 | Bioequivalence | Information not present in EudraCT |
E.6.9 | Dose response | Information not present in EudraCT |
E.6.10 | Pharmacogenetic | Information not present in EudraCT |
E.6.11 | Pharmacogenomic | Information not present in EudraCT |
E.6.12 | Pharmacoeconomic | Information not present in EudraCT |
E.6.13 | Others | Information not present in EudraCT |
E.7 | Trial type and phase |
E.7.1 | Human pharmacology (Phase I) | No |
E.7.1.1 | First administration to humans | Information not present in EudraCT |
E.7.1.2 | Bioequivalence study | Information not present in EudraCT |
E.7.1.3 | Other | Information not present in EudraCT |
E.7.1.3.1 | Other trial type description | |
E.7.2 | Therapeutic exploratory (Phase II) | No |
E.7.3 | Therapeutic confirmatory (Phase III) | Yes |
E.7.4 | Therapeutic use (Phase IV) | No |
E.8 Design of the trial |
E.8.1 | Controlled | Yes |
E.8.1.1 | Randomised | Yes |
E.8.1.2 | Open | No |
E.8.1.3 | Single blind | No |
E.8.1.4 | Double blind | Yes |
E.8.1.5 | Parallel group | No |
E.8.1.6 | Cross over | No |
E.8.1.7 | Other | Yes |
E.8.1.7.1 | Other trial design description |
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E.8.2 | Comparator of controlled trial |
E.8.2.1 | Other medicinal product(s) | Yes |
E.8.2.2 | Placebo | No |
E.8.2.3 | Other | No |
E.8.3 |
The trial involves single site in the Member State concerned
| Yes |
E.8.4 | The trial involves multiple sites in the Member State concerned | No |
E.8.4.1 | Number of sites anticipated in Member State concerned | 1 |
E.8.5 | The trial involves multiple Member States | Information not present in EudraCT |
E.8.5.1 | Number of sites anticipated in the EEA | 60 |
E.8.6 Trial involving sites outside the EEA |
E.8.6.1 | Trial being conducted both within and outside the EEA | Yes |
E.8.6.2 | Trial being conducted completely outside of the EEA | Information not present in EudraCT |
E.8.6.3 | If E.8.6.1 or E.8.6.2 are Yes, specify the regions in which trial sites are planned |
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E.8.7 | Trial has a data monitoring committee | Yes |
E.8.8 |
Definition of the end of the trial and justification where it is not the last
visit of the last subject undergoing the trial
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The end of study is defined when each subject reaches Week 240. |
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E.8.9 Initial estimate of the duration of the trial |
E.8.9.1 | In the Member State concerned years | 6 |
E.8.9.1 | In the Member State concerned months | 0 |
E.8.9.1 | In the Member State concerned days | 0 |
E.8.9.2 | In all countries concerned by the trial years | 6 |
E.8.9.2 | In all countries concerned by the trial months | 0 |
E.8.9.2 | In all countries concerned by the trial days | 0 |