This trial has been completed.

Condition chronic hepatitis b
Treatment abx203 therapeutic hepatitis b vaccine treatment arm
Phase phase 2/phase 3
Sponsor Abivax S.A.
Start date December 2014
End date December 2016
Trial size 261 participants
Trial identifier NCT02249988, ABX203-002


The study is an open-label, randomized, comparative, multicenter clinical trial. The purpose of this study is to assess the efficacy of ABX203, a new chronic hepatitis B therapeutic vaccine administered as an adjunct therapy to nucleos(t)ide analogs (NUCs), in maintaining control of Hepatitis B disease after cessation of treatment with NUCs in subjects with HBeAg negative chronic Hepatitis B.

United States No locations recruiting
Other countries No locations recruiting

Study Design

Allocation randomized
Intervention model parallel assignment
Primary purpose treatment
Masking no masking
ABX203 therapeutic vaccine in addition to NUCs background therapy
abx203 therapeutic hepatitis b vaccine treatment arm
(No Intervention)
NUCs background therapy only

Primary Outcomes

Percentage of subjects with viral load < 40 IU/mL at Week 48.
time frame: Week 48

Secondary Outcomes

Clinical response defined as changes in viral load, liver function, time to relapse
time frame: Week 48 and Week 96
Immune response defined as T-cell response by ICS (CD4 and CD8 to HBcAg and HBsAg)
time frame: Week 48
Safety assessment will be conducted throughout the study and will include physical examinations, vital signs, clinical laboratory évaluations, and the recording of AEs
time frame: Participants will be followed for the duration of their study participation up to 96 weeks

Eligibility Criteria

All participants from 18 years up to 65 years old.

Inclusion Criteria: - Male or female subject between 18 and 65 years of age at the time of randomization. - Must be HBeAg negative and anti-HBe Abs positive for at least 1 year prior to screening and at screening. - Has HBV DNA < 40 IU/mL for at least 1 year prior to screening and at screening - Has both ALT and AST levels ≤ ULN for at least 1 year prior to screening and at screening. - Must be HBsAg positive at screening. - Has been treated with NUCs for at least 2 years prior to screening. - Has not been treated with PEG-IFN or IFN for at least 1 year prior to screening. - For all females, must have a negative serum pregnancy test at screening. For female of childbearing potential, must have been using adequate contraception and must agree to continue to use it during all study period and for 6 months after completion of the study product administration. - Has provided written informed consent. Exclusion Criteria: - Has elevated blood levels of alpha-fetoprotein (AFP) (> 500 ng/mL). - Has cirrhosis, defined as - platelet count < 150,000/mm3, with esophageal varices on imaging and spleen size > 12, or - liver stiffness of 11 kilopascal [kPa] as measured by elastography using FibroScan® or .an AST to Platelet Ratio Index (APRI) > 2). - Has hepatocellular carcinoma (HCC) (diagnosed by ultrasonography). - Has liver decompensation (albumin < 3.5 g/dL and bilirubin ≥1.3 mg/dL). - Is Hepatitis C virus (HCV) Ab positive at screening. - Is Hepatitis delta virus (HDV) Ab positive at screening. - Is Human Immunodeficiency Virus (HIV) Ab positive at screening. - Has an immune suppressive disorder or treatment with immunosuppressive drugs. - Has been treated with corticosteroids within 12 weeks prior to the first administration of study product, with the exception of topical or inhaled corticosteroids. - Has been treated with rituximab. - Has other hepatic diseases of different etiology (such as auto-immune hepatitis, toxic hepatitis, Wilson disease, alcoholic or hemochromatosis). - Has a history of allergic disease or reactions likely to be exacerbated by any component of the study products. - Has a history of a substance abuse (drug or alcohol) problem within the previous 3 years.

Additional Information

Official title Phase IIB-III Efficacy Study of ABX203 Vaccine as an Adjunct Therapy to Nucleos(t)Ide Analogs to Maintain Control of HBV Replication After Cessation of Treatment in HBeAg Negative Patients With Chronic Hepatitis B
Trial information was received from ClinicalTrials.gov and was last updated in January 2017.
Information provided to ClinicalTrials.gov by Abivax S.A..