Chronic Heptitis BNCT01918631
A Randomized Controlled Trial on the Efficacy of Tenofovir Disoproxil Fumarate (TDF)-Switch Therapy in Chronic Hepatitis B Patients With Incomplete Response to Entecavir
A study testing tenofovir disoproxil fumarate and Entecavir in people with Chronic Heptitis B, run by Chinese University of Hong Kong at 1 site in Hong Kong.
Trial summary
Currently, five nucleos(t)ide analogs are approved for the treatment of chronic hepatitis B, namely lamivudine, adefovir dipivoxil, telbivudine, entecavir (ETV) and tenofovir disoproxil fumarate (TDF). Read more about this study
- Who is it for?
- Ages 18 to 65 years
- Conditions the study is for
- Chronic Heptitis B
- What is being tested?
- tenofovir disoproxil fumarate and Entecavir
- Could I receive a placebo?
- No, everyone receives an active treatment
- How many people
- 36 participants
- Where
- 1 siteHong Kong
- Study dates
- Aug 2013to 31 Jan 2017
- Phase
- Interventional
- Are there results?
- None posted in the registry
Key requirements
Who can take part, as listed by the sponsor. Only the study team can confirm whether you are eligible, so take this list to your doctor.
- Ages 18 to 65 years
- All sexes
- No healthy volunteers
- Adult, Older adult
Who may be able to join
- Age 18 or above
- Positive hepatitis B surface antigen for at least 6 months
- On ETV monotherapy as anti-viral treatment for at least 52 weeks
- HBV DNA (>20 IU/ml) at week 52 or more of ETV treatment
- Written informed consent obtained
Who cannot join
- Concurrent use of other antiviral treatment (including oral nucleos(t)ide analogs, interferon or pegylated interferon) for chronic hepatitis B.
- Concurrent use of steroids or immunosuppressive agents more than two week consecutively
- Co-infection with hepatitis C virus (HCV) or human immunodeficiency virus (HIV).
- Features suggestive of concomitant chronic liver diseases: positive anti-nuclear antibody (ANA) titer above 1/160, positive anti-mitochondrial antibody (AMA), anti-smooth muscle antibody (SMA), abnormal serum ceruloplasmin or iron profile, or histological features of alternative chronic liver disease
- Pregnancy or breast feeding.
- Inability or unwillingness to give informed consent or abide by the requirements of the study.
- History of other evidence of severe illness or any other conditions which would make the patient, in the opinion of the investigator, unsuitable for the study.
- Patients with baseline significant impaired renal function with creatinine clearance <30 ml/min or receiving dialysis for end stage renal disease.
Trial locations and contacts
1 site in 1 country.
About this study
Currently, five nucleos(t)ide analogs are approved for the treatment of chronic hepatitis B, namely lamivudine, adefovir dipivoxil, telbivudine, entecavir (ETV) and tenofovir disoproxil fumarate (TDF). ETV and TDF are recommended as first-line therapy by all regional guidelines due to their high anti-viral potency and low risk of inducing resistance.
ETV monotherapy for chronic HBV infection is highly effective in both HBeAg-positive and negative treatment-naïve patients. The cumulative probability of maintained virologic suppression with undetectable HBV DNA at year 1, 2 and 3 were 76.5%, 83.0% and 88.3% respectively.
Read more
TDF is another potent anti-viral treatment for chronic hepatitis B. Up to 72% and 87% of HBeAg-positive and -negative patients achieved undetectable HBV DNA by week 144 of TDF monotherapy. It is also effective in patients with prior exposure to other nucleo(s)tide analogs. Previous studies demonstrated that TDF can be used as an effective rescue therapy in lamivudine or adefovir-treated patients with incomplete virologic response.
However, the optimal treatment for patients with suboptimal response to ETV is uncertain. With this background, we will conduct a randomized controlled trial to evaluate the efficacy of TDF switch therapy in patients with incomplete virologic response to ETV treatment.
Read the detailed description
Chronic hepatitis B virus (HBV) infection affects approximately 400 million people worldwide, and three-quarter of them are from Asia-Pacific region [1-3]. Nucleos(t)ide analogs treatment can suppress viral replication, delay cirrhotic complications and reduce the risk of hepatocellular carcinoma (HCC) [4-5].
Currently, five nucleos(t)ide analogs are approved for the treatment of chronic hepatitis B, namely lamivudine, adefovir dipivoxil, telbivudine, entecavir (ETV) and tenofovir disoproxil fumarate (TDF). ETV and TDF are recommended as first-line therapy by all regional guidelines due to their high anti-viral potency and low risk of inducing resistance [6-8].
ETV monotherapy for chronic HBV infection is highly effective in both HBeAg-positive and negative treatment-naïve patients [9-10]. The cumulative probability of maintained virologic suppression with undetectable HBV DNA at year 1, 2 and 3 were 76.5%, 83.0% and 88.3% respectively [11].
TDF is another potent anti-viral treatment for chronic hepatitis B. Up to 72% and 87% of HBeAg-positive and -negative patients achieved undetectable HBV DNA by week 144 of TDF monotherapy [12]. It is also effective in patients with prior exposure to other nucleo(s)tide analogs. Previous studies demonstrated that TDF can be used as an effective rescue therapy in lamivudine or adefovir-treated patients with incomplete virologic response [13-14].
The importance of complete viral suppression should be emphasized. In treatment-naïve patients, there is a positive correlation between HBV DNA level with risk of developing cirrhosis and HCC [15-17]. In a recent report on 372 ETV-treated patients, suppression of HBV DNA to less than 2000 IU/ml was associated with lower risk of disease progression among those with cirrhosis at baseline [18]. Therefore, suppressing HBV DNA to undetectable level should be the treatment target, especially in patients with established cirrhosis who are at the greatest risk of HCC.
- Conditions
- Chronic Heptitis B
- Being tested
- tenofovir disoproxil fumarate, Entecavir
What participants receive
What participants receive. In a randomised study each person is assigned to one group by chance.
tenofovir disoproxil fumarateDrug
EntecavirDrug
| Study group | Role | What they receive |
|---|---|---|
| Entecavir | Active comparator | Entecavir 0.5mg QD for 48 weeks Receives: Drug: Entecavir |
| tenofovir disoproxil fumarate | Active comparator | tenofovir disoproxil fumarate 300mg QD for 48 weeks Receives: Drug: tenofovir disoproxil fumarate |
What is being measured
The primary outcome is the main question the study is designed to answer.
Maintained virologic response
Undetectable HBV DNA by PCR assay
Measured: 48 weeks
Secondary outcomes (4)
Undetectable HBV DNA at week 24 and 48
Measured: At week 24 and 48
Amino acid substitutions or drug resistance
Measured: At week 48
Normal ALT, RFT and bone profile
Measured: At week 24 and 48
Numbers of adverse events or serious adverse events
An adverse event is any undesirable medical event occurring in the subject within the trial period, whether or not it is related to the study drug.
A serious adverse event is an adverse event that results in one of the following outcomes:
- Death
- Life-threatening
- In-patient hospitalization or prolongation of existing hospitalization
- A persistent or significant disability/incapacity
Measured: At week 48
Timeline
From the start of the study to its completion; the mark is today. Estimated dates are the sponsor’s plan.
- First posted8 Aug 2013 (estimated)
- Study startAug 2013
- Primary completionJan 2017
- Study completion31 Jan 2017
Resources
- Official record on ClinicalTrials.govThe registry entry this page is built from, with its full change history.
- Publications (18)Papers the sponsor has linked to this study.
- Other trials for Chronic Heptitis BStudies of the same condition, open and under way.
- More trials run by Chinese University of Hong KongThe sponsor's other registered studies.
- What the trial phases meanHow a treatment moves from first tests in people to approval.
More details
For doctors and researchers: how the study is designed, who runs it, and its registry IDs.
Study design
- Study type
- Interventional
- Phase
- Phase N/A
- Primary purpose
- Treatment
- Allocation
- Randomised
- Intervention model
- Parallel groups
- Masking
- None (open label)
- Enrolment
- 36 participants (actual)
Sponsor and investigators
- Lead sponsor
- Chinese University of Hong Kong
- Sponsor type
- University, hospital or other
- Responsible party
- Principal investigator, Prof Wong, Lai Hung Grace, Chinese University of Hong Kong
- Investigators
- Grace LH Wong, MD, Principal investigator, Chinese University of Hong Kong
IDs, dates and publications
- ClinicalTrials.gov ID
- NCT01918631
- Sponsor's protocol ID
- TDF-ETV-RCT studyA
- Status last verified
- Jul 2017
- First submitted
- 6 Aug 2013
- Last updated
- 19 Jul 2017
- Results posted
- No
- Data monitoring committee
- Yes
Publications
Chan HL, Jia J. Chronic hepatitis B in Asia-new insights from the past decade. J Gastroenterol Hepatol. 2011 Jan;26 Suppl 1:131-7. doi: 10.1111/j.1440-1746.2010.06544.x.
PubMed 21199524Lavanchy D. Hepatitis B virus epidemiology, disease burden, treatment, and current and emerging prevention and control measures. J Viral Hepat. 2004 Mar;11(2):97-107. doi: 10.1046/j.1365-2893.2003.00487.x.
PubMed 14996343Yim HJ, Lok AS. Natural history of chronic hepatitis B virus infection: what we knew in 1981 and what we know in 2005. Hepatology. 2006 Feb;43(2 Suppl 1):S173-81. doi: 10.1002/hep.20956.
PubMed 16447285Sung JJ, Tsoi KK, Wong VW, Li KC, Chan HL. Meta-analysis: Treatment of hepatitis B infection reduces risk of hepatocellular carcinoma. Aliment Pharmacol Ther. 2008 Nov 1;28(9):1067-77. doi: 10.1111/j.1365-2036.2008.03816.x. Epub 2008 Jul 24.
PubMed 18657133Chan HL, Sung JJ. Hepatocellular carcinoma and hepatitis B virus. Semin Liver Dis. 2006 May;26(2):153-61. doi: 10.1055/s-2006-939753.
PubMed 16673293Lok AS, McMahon BJ. Chronic hepatitis B: update 2009. Hepatology. 2009 Sep;50(3):661-2. doi: 10.1002/hep.23190. No abstract available.
PubMed 19714720European Association For The Study Of The Liver. EASL clinical practice guidelines: Management of chronic hepatitis B virus infection. J Hepatol. 2012 Jul;57(1):167-85. doi: 10.1016/j.jhep.2012.02.010. Epub 2012 Mar 20. No abstract available.
PubMed 22436845Gish RG, Lok AS, Chang TT, de Man RA, Gadano A, Sollano J, Han KH, Chao YC, Lee SD, Harris M, Yang J, Colonno R, Brett-Smith H. Entecavir therapy for up to 96 weeks in patients with HBeAg-positive chronic hepatitis B. Gastroenterology. 2007 Nov;133(5):1437-44. doi: 10.1053/j.gastro.2007.08.025. Epub 2007 Aug 14.
PubMed 17983800Lai CL, Shouval D, Lok AS, Chang TT, Cheinquer H, Goodman Z, DeHertogh D, Wilber R, Zink RC, Cross A, Colonno R, Fernandes L; BEHoLD AI463027 Study Group. Entecavir versus lamivudine for patients with HBeAg-negative chronic hepatitis B. N Engl J Med. 2006 Mar 9;354(10):1011-20. doi: 10.1056/NEJMoa051287.
PubMed 16525138Wong GL, Wong VW, Chan HY, Tse PC, Wong J, Chim AM, Yiu KK, Chu SH, Chan HL. Undetectable HBV DNA at month 12 of entecavir treatment predicts maintained viral suppression and HBeAg-seroconversion in chronic hepatitis B patients at 3 years. Aliment Pharmacol Ther. 2012 Jun;35(11):1326-35. doi: 10.1111/j.1365-2036.2012.05098.x. Epub 2012 Apr 16.
PubMed 22506552Heathcote EJ, Marcellin P, Buti M, Gane E, De Man RA, Krastev Z, Germanidis G, Lee SS, Flisiak R, Kaita K, Manns M, Kotzev I, Tchernev K, Buggisch P, Weilert F, Kurdas OO, Shiffman ML, Trinh H, Gurel S, Snow-Lampart A, Borroto-Esoda K, Mondou E, Anderson J, Sorbel J, Rousseau F. Three-year efficacy and safety of tenofovir disoproxil fumarate treatment for chronic hepatitis B. Gastroenterology. 2011 Jan;140(1):132-43. doi: 10.1053/j.gastro.2010.10.011. Epub 2010 Oct 16.
PubMed 20955704Patterson SJ, George J, Strasser SI, Lee AU, Sievert W, Nicoll AJ, Desmond PV, Roberts SK, Locarnini S, Bowden S, Angus PW. Tenofovir disoproxil fumarate rescue therapy following failure of both lamivudine and adefovir dipivoxil in chronic hepatitis B. Gut. 2011 Feb;60(2):247-54. doi: 10.1136/gut.2010.223206. Epub 2010 Oct 29.
PubMed 21036792Berg T, Marcellin P, Zoulim F, Moller B, Trinh H, Chan S, Suarez E, Lavocat F, Snow-Lampart A, Frederick D, Sorbel J, Borroto-Esoda K, Oldach D, Rousseau F. Tenofovir is effective alone or with emtricitabine in adefovir-treated patients with chronic-hepatitis B virus infection. Gastroenterology. 2010 Oct;139(4):1207-17. doi: 10.1053/j.gastro.2010.06.053. Epub 2010 Jun 20.
PubMed 20600025Chen CJ, Iloeje UH, Yang HI. Long-term outcomes in hepatitis B: the REVEAL-HBV study. Clin Liver Dis. 2007 Nov;11(4):797-816, viii. doi: 10.1016/j.cld.2007.08.005.
PubMed 17981229Chen CJ, Yang HI, Su J, Jen CL, You SL, Lu SN, Huang GT, Iloeje UH; REVEAL-HBV Study Group. Risk of hepatocellular carcinoma across a biological gradient of serum hepatitis B virus DNA level. JAMA. 2006 Jan 4;295(1):65-73. doi: 10.1001/jama.295.1.65.
PubMed 16391218
Study at a glance
From the registry record, last updated by the sponsor on 19 Jul 2017. Recruitment status is as the sponsor reported it: confirm with the study team.
- Official title
- A Randomized Controlled Trial on the Efficacy of Tenofovir Disoproxil Fumarate (TDF)-Switch Therapy in Chronic Hepatitis B Patients With Incomplete Response to Entecavir
- ClinicalTrials.gov ID
- NCT01918631
- Acronym / sponsor ID
- TDF-ETV-RCT studyA
- Conditions
- Chronic Heptitis B
- Study type
- Interventional
- Recruitment status
- Completed
- Enrolment
- 36 participants (actual)
- Lead sponsor
- Chinese University of Hong KongUniversity, hospital or other
- Study start
- Aug 2013
- Primary completion
- Jan 2017 (actual)
- Study completion
- 31 Jan 2017 (actual)
- First posted
- 8 Aug 2013 (estimated)
- Results
- Not posted in the source record
Clinical summary
The research question as the sponsor registered it. This describes what the study plans to test, not what it found.
Currently, five nucleos(t)ide analogs are approved for the treatment of chronic hepatitis B, namely lamivudine, adefovir dipivoxil, telbivudine, entecavir (ETV) and tenofovir disoproxil fumarate (TDF). ETV and TDF are recommended as first-line therapy by all regional guidelines due to their high anti-viral potency and low risk of inducing resistance.
ETV monotherapy for chronic HBV infection is highly effective in both HBeAg-positive and negative treatment-naïve patients. The cumulative probability of maintained virologic suppression with undetectable HBV DNA at year 1, 2 and 3 were 76.5%, 83.0% and 88.3% respectively.
TDF is another potent anti-viral treatment for chronic hepatitis B. Up to 72% and 87% of HBeAg-positive and -negative patients achieved undetectable HBV DNA by week 144 of TDF monotherapy. It is also effective in patients with prior exposure to other nucleo(s)tide analogs. Previous studies demonstrated that TDF can be used as an effective rescue therapy in lamivudine or adefovir-treated patients with incomplete virologic response.
However, the optimal treatment for patients with suboptimal response to ETV is uncertain. With this background, we will conduct a randomized controlled trial to evaluate the efficacy of TDF switch therapy in patients with incomplete virologic response to ETV treatment.
Detailed description
Chronic hepatitis B virus (HBV) infection affects approximately 400 million people worldwide, and three-quarter of them are from Asia-Pacific region [1-3]. Nucleos(t)ide analogs treatment can suppress viral replication, delay cirrhotic complications and reduce the risk of hepatocellular carcinoma (HCC) [4-5].
Currently, five nucleos(t)ide analogs are approved for the treatment of chronic hepatitis B, namely lamivudine, adefovir dipivoxil, telbivudine, entecavir (ETV) and tenofovir disoproxil fumarate (TDF). ETV and TDF are recommended as first-line therapy by all regional guidelines due to their high anti-viral potency and low risk of inducing resistance [6-8].
ETV monotherapy for chronic HBV infection is highly effective in both HBeAg-positive and negative treatment-naïve patients [9-10]. The cumulative probability of maintained virologic suppression with undetectable HBV DNA at year 1, 2 and 3 were 76.5%, 83.0% and 88.3% respectively [11].
TDF is another potent anti-viral treatment for chronic hepatitis B. Up to 72% and 87% of HBeAg-positive and -negative patients achieved undetectable HBV DNA by week 144 of TDF monotherapy [12]. It is also effective in patients with prior exposure to other nucleo(s)tide analogs. Previous studies demonstrated that TDF can be used as an effective rescue therapy in lamivudine or adefovir-treated patients with incomplete virologic response [13-14].
The importance of complete viral suppression should be emphasized. In treatment-naïve patients, there is a positive correlation between HBV DNA level with risk of developing cirrhosis and HCC [15-17]. In a recent report on 372 ETV-treated patients, suppression of HBV DNA to less than 2000 IU/ml was associated with lower risk of disease progression among those with cirrhosis at baseline [18]. Therefore, suppressing HBV DNA to undetectable level should be the treatment target, especially in patients with established cirrhosis who are at the greatest risk of HCC.
Study design
- Primary purpose
- Treatment
- Allocation
- Randomised
- Intervention model
- Parallel groups
- Masking
- None (open label)
- Number of arms
- 2
| Arm | Type | Receives |
|---|---|---|
| Entecavir | Active comparator | Drug: EntecavirEntecavir 0.5mg QD for 48 weeks |
| tenofovir disoproxil fumarate | Active comparator | Drug: tenofovir disoproxil fumaratetenofovir disoproxil fumarate 300mg QD for 48 weeks |
Who may qualify
- Ages
- 18 to 65 years
- Sex
- All
- Healthy volunteers
- Not accepted
- Age groups
- Adult, Older adult
Key inclusion criteria (5 listed)
- Age 18 or above
- Positive hepatitis B surface antigen for at least 6 months
- On ETV monotherapy as anti-viral treatment for at least 52 weeks
- HBV DNA (>20 IU/ml) at week 52 or more of ETV treatment
- Written informed consent obtained
Key exclusion criteria (8 listed)
- Concurrent use of other antiviral treatment (including oral nucleos(t)ide analogs, interferon or pegylated interferon) for chronic hepatitis B.
- Concurrent use of steroids or immunosuppressive agents more than two week consecutively
- Co-infection with hepatitis C virus (HCV) or human immunodeficiency virus (HIV).
- Features suggestive of concomitant chronic liver diseases: positive anti-nuclear antibody (ANA) titer above 1/160, positive anti-mitochondrial antibody (AMA), anti-smooth muscle antibody (SMA), abnormal serum ceruloplasmin or iron profile, or histological features of alternative chronic liver disease
- Pregnancy or breast feeding.
Eligibility is decided by the study team after screening; this overview does not establish that a patient qualifies. Full inclusion and exclusion criteria.
Interventions
| Intervention | Type | Arms |
|---|---|---|
| tenofovir disoproxil fumarate | Drug | tenofovir disoproxil fumarate |
| Entecavir | Drug | Entecavir |
Primary outcome
Maintained virologic response
Time frame: 48 weeks
Undetectable HBV DNA by PCR assay
4 secondary outcomes
Undetectable HBV DNA at week 24 and 48
Time frame: At week 24 and 48
Amino acid substitutions or drug resistance
Time frame: At week 48
Normal ALT, RFT and bone profile
Time frame: At week 24 and 48
Numbers of adverse events or serious adverse events
Time frame: At week 48
Results and safety
The study is completed, but results are not available in the source record. That does not mean the treatment did or did not work.
Research links
- Official record on ClinicalTrials.govLast updated by the sponsor 19 Jul 2017.
- Background: PubMed 21199524Chan HL, Jia J. Chronic hepatitis B in Asia-new insights from the past decade. J Gastroenterol Hepatol. 2011 Jan;26 Suppl 1:131-7. doi: 10.1111/j.1440-1746.2010.06544.x.
- Background: PubMed 14996343Lavanchy D. Hepatitis B virus epidemiology, disease burden, treatment, and current and emerging prevention and control measures. J Viral Hepat. 2004 Mar;11(2):97-107. doi: 10.1046/j.1365-2893.2003.00487.x.
- Background: PubMed 16447285Yim HJ, Lok AS. Natural history of chronic hepatitis B virus infection: what we knew in 1981 and what we know in 2005. Hepatology. 2006 Feb;43(2 Suppl 1):S173-81. doi: 10.1002/hep.20956.
- Background: PubMed 18657133Sung JJ, Tsoi KK, Wong VW, Li KC, Chan HL. Meta-analysis: Treatment of hepatitis B infection reduces risk of hepatocellular carcinoma. Aliment Pharmacol Ther. 2008 Nov 1;28(9):1067-77. doi: 10.1111/j.1365-2036.2008.03816.x. Epub 2008 Jul 24.
- Background: PubMed 16673293Chan HL, Sung JJ. Hepatocellular carcinoma and hepatitis B virus. Semin Liver Dis. 2006 May;26(2):153-61. doi: 10.1055/s-2006-939753.
- Background: PubMed 19714720Lok AS, McMahon BJ. Chronic hepatitis B: update 2009. Hepatology. 2009 Sep;50(3):661-2. doi: 10.1002/hep.23190. No abstract available.
- Background: PubMed 22436845European Association For The Study Of The Liver. EASL clinical practice guidelines: Management of chronic hepatitis B virus infection. J Hepatol. 2012 Jul;57(1):167-85. doi: 10.1016/j.jhep.2012.02.010. Epub 2012 Mar 20. No abstract available.
- Background: PubMed 17983800Gish RG, Lok AS, Chang TT, de Man RA, Gadano A, Sollano J, Han KH, Chao YC, Lee SD, Harris M, Yang J, Colonno R, Brett-Smith H. Entecavir therapy for up to 96 weeks in patients with HBeAg-positive chronic hepatitis B. Gastroenterology. 2007 Nov;133(5):1437-44. doi: 10.1053/j.gastro.2007.08.025. Epub 2007 Aug 14.
- Background: PubMed 16525138Lai CL, Shouval D, Lok AS, Chang TT, Cheinquer H, Goodman Z, DeHertogh D, Wilber R, Zink RC, Cross A, Colonno R, Fernandes L; BEHoLD AI463027 Study Group. Entecavir versus lamivudine for patients with HBeAg-negative chronic hepatitis B. N Engl J Med. 2006 Mar 9;354(10):1011-20. doi: 10.1056/NEJMoa051287.
- Background: PubMed 22506552Wong GL, Wong VW, Chan HY, Tse PC, Wong J, Chim AM, Yiu KK, Chu SH, Chan HL. Undetectable HBV DNA at month 12 of entecavir treatment predicts maintained viral suppression and HBeAg-seroconversion in chronic hepatitis B patients at 3 years. Aliment Pharmacol Ther. 2012 Jun;35(11):1326-35. doi: 10.1111/j.1365-2036.2012.05098.x. Epub 2012 Apr 16.
- Background: PubMed 20955704Heathcote EJ, Marcellin P, Buti M, Gane E, De Man RA, Krastev Z, Germanidis G, Lee SS, Flisiak R, Kaita K, Manns M, Kotzev I, Tchernev K, Buggisch P, Weilert F, Kurdas OO, Shiffman ML, Trinh H, Gurel S, Snow-Lampart A, Borroto-Esoda K, Mondou E, Anderson J, Sorbel J, Rousseau F. Three-year efficacy and safety of tenofovir disoproxil fumarate treatment for chronic hepatitis B. Gastroenterology. 2011 Jan;140(1):132-43. doi: 10.1053/j.gastro.2010.10.011. Epub 2010 Oct 16.
- Background: PubMed 21036792Patterson SJ, George J, Strasser SI, Lee AU, Sievert W, Nicoll AJ, Desmond PV, Roberts SK, Locarnini S, Bowden S, Angus PW. Tenofovir disoproxil fumarate rescue therapy following failure of both lamivudine and adefovir dipivoxil in chronic hepatitis B. Gut. 2011 Feb;60(2):247-54. doi: 10.1136/gut.2010.223206. Epub 2010 Oct 29.
Referral and contact
AzTrials does not enrol participants or take referrals. Contact the study team or a site listed below; they decide who can take part. This study is not recruiting at the moment.
Grace LH Wong, MD principal investigator
Chinese University of Hong Kong
1 site in 1 country: see every site and its status.
Questions about this trial
What is this clinical trial studying?
A study testing tenofovir disoproxil fumarate and Entecavir in people with Chronic Heptitis B, run by Chinese University of Hong Kong at 1 site in Hong Kong.
The full registered description is in the About this study section and the official record.
Who may be eligible to take part?
The sponsor lists 5 inclusion and 8 exclusion criteria. Eligibility is decided by the study team after screening, so read the full criteria and contact a listed site.
Is this clinical trial currently recruiting?
The record says: finished, as of the sponsor's last update on 19 Jul 2017. Status can change between updates, so confirm with the study contact before making plans.
Where is the study taking place?
The record lists 1 site in Hong Kong. Whether a site is taking part right now should be confirmed with that site. See every site.
What are the possible benefits and risks?
They depend on the study and the treatment, and no study can promise a benefit. The study team explains the known risks during informed consent, before anyone joins; the record itself does not list them.
Are results available for this study?
The study is completed, but results are not available in the source record. That does not mean the treatment did or did not work.
How can a doctor refer a patient or contact the research team?
The record lists no contact. The official record names the sponsor, who can be asked directly. AzTrials does not enrol participants or take referrals.
What does the primary outcome measure?
Maintained virologic response (time frame: 48 weeks). It is what the study was designed to measure, not a finding.
Where can I read the original study information?
On the ClinicalTrials.gov record for NCT01918631, which also lists 18 linked publications.
Does a listing mean the treatment is approved or proven to work?
No. A listing means the study is registered. It does not show that the treatment is safe, works, or is approved by a regulator.
How often is this information updated?
AzTrials copies changed records from ClinicalTrials.gov every night and reloads the whole registry every week. The sponsor last updated this record on 19 Jul 2017.