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A Study to Compare Tenofovir Versus Hepsera (Adefovir) for the Treatment of HBeAg Negative Chronic Hepatitis B

The recruitment status of this study is unknown because the information has not been verified recently.
Verified January 2011 by Gilead Sciences.
Recruitment status was  Active, not recruiting
Sponsor:
Information provided by:
Gilead Sciences
ClinicalTrials.gov Identifier:
NCT00117676
First received: June 30, 2005
Last updated: January 5, 2011
Last verified: January 2011
Results First Received: February 11, 2010  
Study Type: Interventional
Study Design: Allocation: Randomized;   Endpoint Classification: Safety/Efficacy Study;   Intervention Model: Parallel Assignment;   Masking: Double Blind (Subject, Caregiver, Investigator, Outcomes Assessor);   Primary Purpose: Treatment
Condition: Chronic Hepatitis B
Interventions: Drug: Tenofovir DF (TDF) 300 mg
Drug: Double-blind adefovir dipivoxil (ADV) 10 mg (switch to open-label TDF 300 mg post Week 48)

  Participant Flow
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Recruitment Details
Key information relevant to the recruitment process for the overall study, such as dates of the recruitment period and locations
There were 79 enrolling sites in 15 countries. The first participant was screened on 07 June 2005, and the last participant was randomized on 15 May 2006. The last participant observation (LPO) for the primary endpoint analysis (Week 48) was 13 April 2007. The LPO for the Week 96 analysis was 06 May 2008.

Pre-Assignment Details
Significant events and approaches for the overall study following participant enrollment, but prior to group assignment
Seven of the 382 participants who were randomized discontinued prior to the first dose of study drug either due to screening failure (after erroneously being randomized via interactive voice response system) or withdrawal of consent. The screening process involved a liver biopsy.

Reporting Groups
  Description
TDF 300 mg QD Double-blind TDF 300 mg once daily for 48 weeks followed by OL TDF for an additional 336 weeks.
ADV 10 mg QD Double-blind ADV 10 mg once daily for 48 weeks then switch to OL TDF 300 mg once daily for an additional 336 weeks.

Participant Flow for 2 periods

Period 1:   Double-blind Period Through Week 48
    TDF 300 mg QD     ADV 10 mg QD  
STARTED     250 [1]   125 [1]
COMPLETED     234 [2]   113 [2]
NOT COMPLETED     16     12  
Lost to Follow-up                 1                 0  
Safety, Tolerability, or Efficacy                 5                 2  
Withdrawal by Subject                 0                 1  
Protocol Violation                 0                 1  
No end-of-blinded-treatment liver biopsy                 6                 5  
Unusable end-of-blinded-treatment biopsy                 4                 3  
[1] Randomized-and-treated participants
[2] Completed through Week 48 with usable end-of-blinded treatment liver biopsy result

Period 2:   Open-label TDF Period Through Week 96
    TDF 300 mg QD     ADV 10 mg QD  
STARTED     235 [1]   112 [2]
COMPLETED     225 [3]   110 [3]
NOT COMPLETED     10     2  
Lost to Follow-up                 3                 0  
Safety, Tolerability, or Efficacy                 2                 1  
Withdrawal by Subject                 5                 1  
[1] Entered the OL TDF phase. One participant entered OL without a usable Week 48 biopsy specimen.
[2] Entered the OL TDF phase
[3] Completed through Week 96



  Baseline Characteristics
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Population Description
Explanation of how the number of participants for analysis was determined. Includes whether analysis was per protocol, intention to treat, or another method. Also provides relevant details such as imputation technique, as appropriate.
No text entered.

Reporting Groups
  Description
TDF 300 mg QD Double-blind TDF 300 mg once daily for 48 weeks followed by OL TDF for an additional 336 weeks.
ADV 10 mg QD Double-blind ADV 10 mg once daily for 48 weeks then switch to OL TDF 300 mg once daily for an additional 336 weeks.
Total Total of all reporting groups

Baseline Measures
    TDF 300 mg QD     ADV 10 mg QD     Total  
Number of Participants  
[units: participants]
  250     125     375  
Age  
[units: Participants]
     
<=18 years     0     1     1  
Between 18 and 65 years     247     123     370  
>=65 years     3     1     4  
Age  
[units: years]
Mean ± Standard Deviation
  44  ± 10.6     43  ± 10.0     44  ± 10.4  
Gender  
[units: participants]
     
Female     57     28     85  
Male     193     97     290  
Race/Ethnicity, Customized [1]
[units: Participants]
     
American Indian or Alaska Native     0     0     0  
Asian     63     30     93  
Native Hawaiian or Other Pacific Islander     7     2     9  
Black or African American     8     4     12  
White     161     81     242  
More than one race     0     0     0  
Unknown or Not Reported     11     8     19  
Region of Enrollment  
[units: participants]
     
United States     25     11     36  
Greece     19     9     28  
Spain     15     6     21  
Turkey     11     3     14  
Italy     6     0     6  
United Kingdom     5     2     7  
France     13     5     18  
Czech Republic     7     5     12  
Canada     29     18     47  
Poland     13     11     24  
Australia     14     8     22  
Bulgaria     49     23     72  
Germany     19     11     30  
Netherlands     1     1     2  
New Zealand     24     12     36  
Baseline Alanine Aminotransferase (ALT) Above the Upper Limit of the Normal (ULN) Range [1]
[units: Participants]
     
Yes     236     118     354  
No     14     7     21  
Prior Lamivudine or Emtricitabine Experience [1]
[units: Participants]
     
Yes     43     23     66  
No     207     102     309  
Baseline Hepatitis B Virus Deoxyribonucleic Acid (HBV DNA) [1]
[units: Log10 copies/mL]
Mean ± Standard Deviation
  6.86  ± 1.308     6.98  ± 1.266     6.90  ± 1.294  
Baseline Knodell Necroinflammatory Score [2]
[units: Units on a scale]
Mean ± Standard Deviation
  7.8  ± 2.45     7.8  ± 2.20     7.8  ± 2.37  
[1] Randomized-and-treated analysis set
[2] Randomized-and-treated analysis set. Based on Knodell numerical scoring of liver biopsy specimens. This scale consists of 5 domains (Periportal with or without Bridging Necrosis [scored numerically from best to worst 0, 1, 3, 4, 5, 6, or 10]; Intralobular Degeneration and Focal Necrosis [scored best to worst 0 to 4]; Portal Inflammation [also scored best to worst 0 to 4]; and Fibrosis [also scored best to worst 0 to 4]). The necroinflammatory score is the combined score for necrosis and inflammation, excluding the fibrosis score. Scores may range from 0 (best) to 14 (worst).



  Outcome Measures
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1.  Primary:   Percentage of Participants With Hepatitis B Virus Deoxyribonucleic Acid (HBV DNA) <400 Copies/mL and Histological Improvement (2-point Reduction in Knodell Necroinflammatory Score Without Worsening in Knodell Fibrosis Score) at Week 48   [ Time Frame: 48 weeks ]

2.  Secondary:   Percentage of Participants With HBV DNA <400 Copies/mL at Week 48   [ Time Frame: Week 48 ]

3.  Secondary:   Percentage of Participants With HBV DNA <400 Copies/mL at Week 96   [ Time Frame: Week 96 ]

4.  Secondary:   Percentage of Participants With Histological Response at Week 48   [ Time Frame: Week 48 ]

5.  Secondary:   Percentage of Participants With Alanine Aminotransferase (ALT) Normalization at Week 48   [ Time Frame: Week 48 ]

6.  Secondary:   Percentage of Participants With ALT Normalization at Week 96   [ Time Frame: Week 96 ]

7.  Secondary:   Percentage of Participants With Hepatitis B S-Antigen (HBsAg) Loss or Seroconversion at Week 48   [ Time Frame: Week 48 ]

8.  Secondary:   Percentage of Participants With HBsAg Loss or Seroconversion at Week 96   [ Time Frame: Week 96 ]

9.  Secondary:   Number of Participants With HBV Genotypic Changes From Baseline at Week 48 (Resistance Surveillance)   [ Time Frame: Week 48 ]
  Hide Outcome Measure 9

Measure Type Secondary
Measure Title Number of Participants With HBV Genotypic Changes From Baseline at Week 48 (Resistance Surveillance)
Measure Description No text entered.
Time Frame Week 48  
Safety Issue No  

Population Description
Explanation of how the number of participants for analysis was determined. Includes whether analysis was per protocol, intention to treat, or another method. Also provides relevant details such as imputation technique, as appropriate.
Randomized-and-treated analysis set. Participants evaluated for resistance included those with HBV DNA >/= 400 copies/mL, those with viral rebound, and those who discontinued after Week 24 with HBV DNA >/= 400 copies/mL.

Reporting Groups
  Description
TDF 300 mg QD Double-blind TDF 300 mg once daily for 48 weeks followed by OL TDF for an additional 336 weeks.
ADV 10 mg QD Double-blind ADV 10 mg once daily for 48 weeks then switch to OL TDF 300 mg once daily for an additional 336 weeks.

Measured Values
    TDF 300 mg QD     ADV 10 mg QD  
Number of Participants Analyzed  
[units: participants]
  250     125  
Number of Participants With HBV Genotypic Changes From Baseline at Week 48 (Resistance Surveillance)  
[units: Participants]
   
Participants evaluated     8     42  
Changes at conserved sites in HBV polymerase     0     7  
Polymorphic site changes (wild-type virus)     3     9  
No genotypic changes from baseline     4     23  
Unable to be genotyped     1     3  

No statistical analysis provided for Number of Participants With HBV Genotypic Changes From Baseline at Week 48 (Resistance Surveillance)



10.  Secondary:   Number of Participants With HBV Genotypic Changes From Baseline at Week 96 (Resistance Surveillance)   [ Time Frame: Week 96 ]


  Serious Adverse Events


  Other Adverse Events


  Limitations and Caveats
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Limitations of the study, such as early termination leading to small numbers of participants analyzed and technical problems with measurement leading to unreliable or uninterpretable data
No text entered.


  More Information