HepTcell Immunotherapy in Patients With Inactive Chronic Hepatitis B (CHB)

December 4, 2025 updated by: Altimmune, Inc.

Phase 2, Double-blind, Randomized, Placebo-controlled Study of HepTcell (Adjuvanted FP-02.2) as an Immunotherapeutic Vaccine in Treatment-naïve Patients With Inactive Chronic Hepatitis B (CHB)

A study to evaluate the antiviral effects, immunogenicity, and safety of HepTcell in treatment-naive patients with inactive chronic hepatitis B (CHB) and low hepatitis B surface antigen (HBsAg) levels.

Study Overview

Status

Status

Indicates the current recruitment status or the expanded access status.
Terminated

Conditions

Conditions

The disease, disorder, syndrome, illness, or injury that is being studied. On ClinicalTrials.gov, conditions may also include other health-related issues, such as lifespan, quality of life, and health risks.

Intervention / Treatment

Intervention / Treatment

A process or action that is the focus of a clinical study. Interventions include drugs, medical devices, procedures, vaccines, and other products that are either investigational or already available. Interventions can also include noninvasive approaches, such as education or modifying diet and exercise.

Study Type

Study Type

Describes the nature of a clinical study. Study types include interventional studies (also called clinical trials), observational studies (including patient registries), and expanded access.
Interventional

Enrollment (Actual)

Enrollment

The number of participants in a clinical study. The "anticipated" enrollment is the target number of participants that the researchers need for the study.
87

Phase

Phase

The stage of a clinical trial studying a drug or biological product, based on definitions developed by the U.S. Food and Drug Administration (FDA). The phase is based on the study's objective, the number of participants, and other characteristics. There are five phases: Early Phase 1 (formerly listed as Phase 0), Phase 1, Phase 2, Phase 3, and Phase 4. Not Applicable is used to describe trials without FDA-defined phases, including trials of devices or behavioral interventions.
  • Phase 2

Contacts and Locations

This section provides the contact details for those conducting the study, and information on where this study is being conducted.

Study Contact

Study Contact

The name and contact information for the person who can answer enrollment questions for a clinical study. Each location where the study is being conducted may also have a specific contact, who may be better able to answer those questions.

Study Locations

  • Canada
    • Alberta
      • Calgary, Alberta, Canada, T2N 4Z6
        • University of Calgary Liver Unit - Heritage Medical Research Clinic
      • Edmonton, Alberta, Canada, T6G 2G3
        • University of Alberta Hospital
    • Ontario
      • Ottawa, Ontario, Canada, K1H 8L6
        • The Ottawa Hospital
      • Toronto, Ontario, Canada, M6H 3M1
        • Toronto Liver Centre
      • Toronto, Ontario, Canada, M5G 2C4
        • Toronto Centre for Liver Disease (TCLD), Toronto General Hospital, UHN
  • Germany
      • Frankfurt am Main, Germany, 60590
        • Goethe University Hospital
      • Hamburg, Germany, 20246
        • Univesritätsklinikum Hamburg-Eppendorf
  • Spain
      • Barcelona, Spain, 08035
        • Hospital Universitari Vall d'Hebron
      • Barcelona, Spain, 08028
        • Hospital Clinic de Barcelona
      • Madrid, Spain, 28046
        • Hospital Universitario La Paz
      • Seville, Spain, 41014
        • Hospital Nuestra Senora de Valme
      • Valencia, Spain, 46026
        • Hospital Universitari i Politecnic La Fe
      • Valencia, Spain, 46014
        • Consorcio Hospital General Universitario de Valencia
  • United Kingdom
      • London, United Kingdom, W2 1NY
        • St. Mary's Hospital
      • London, United Kingdom, SW17 0RE
        • St. Georges University of London
      • Nottingham, United Kingdom, NG7 2UH
        • Queens Medical Center
  • United States
    • California
      • Garden Grove, California, United States, 92840
        • Paragon Rx Clinical
      • Redwood City, California, United States, 94063
        • Stanford University Department of Medicine
      • San Jose, California, United States, 95128
        • San Jose Gastroenterology Institute
    • Missouri
      • Kansas City, Missouri, United States, 64131
        • Kansas City Research Institute
    • Oklahoma
      • Oklahoma City, Oklahoma, United States, 73071
        • Central Sooner Research

Participation Criteria

Researchers look for people who fit a certain description, called eligibility criteria. Some examples of these criteria are a person's general health condition or prior treatments.

Eligibility Criteria

Eligibility Criteria

The key requirements that people who want to participate in a clinical study must meet or the characteristics they must have. Eligibility criteria consist of both inclusion criteria (which are required for a person to participate in the study) and exclusion criteria (which prevent a person from participating). Types of eligibility criteria include whether a study accepts healthy volunteers, has age or age group requirements, or is limited by sex.

Ages Eligible for Study

18 years to 65 years (Adult, Older Adult)

Accepts Healthy Volunteers

No

Description

Inclusion Criteria:

  • Men and women 18 to 65 years of age, inclusive
  • Inactive CHB with documented HBsAg positivity for at least 12 months before Day 1
  • qHBsAg ≥ 10 IU/mL but ≤ 100 IU/mL in the 12 months prior to screening
  • HBV DNA ≥ 10 IU/mL at screening
  • AST, ALT, INR, albumin, total bilirubin (excluding patients with Gilbert Syndrome) and direct bilirubin within normal limits at screening

Exclusion Criteria:

  • Positive hepatitis B e antigen (HBeAg) at screening
  • History of a hepatitis B flare or 1-log increase in HBV DNA or HBsAg in the prior 12 months
  • Undetectable HBV DNA at screening
  • Fibroscan > 8.5 kPA at screening, or history of hepatic fibrosis or cirrhosis (NB, a Fibroscan is not required if an examination is performed within 12 months or a liver biopsy was performed within 2 years before Screening and no fibrosis [F1 or greater] was identified).

Study Plan

This section provides details of the study plan, including how the study is designed and what the study is measuring.

How is the study designed?

Design Details

  • Primary Purpose: Treatment
  • Allocation: Randomized
  • Interventional Model: Parallel Assignment
  • Masking: Double

Arms and Interventions

Participant Group / Arm

Participant Group / Arm

A group or subgroup of participants in a clinical trial that receives a specific intervention/treatment, or no intervention, according to the trial's protocol.
Intervention / Treatment

Intervention / Treatment

A process or action that is the focus of a clinical study. Interventions include drugs, medical devices, procedures, vaccines, and other products that are either investigational or already available. Interventions can also include noninvasive approaches, such as education or modifying diet and exercise.
Experimental: HepTcell
Dose administered at intervals of 4 weeks for 6 doses
Biological: HepTcell
Intramuscular injection
Placebo Comparator: Placebo
Dose administered at intervals of 4 weeks for 6 doses
Drug: Placebo
Intramuscular injection

What is the study measuring?

Primary Outcome Measures

Primary Outcome Measures

In a clinical study's protocol, the planned outcome measure that is the most important for evaluating the effect of an intervention/treatment. Most clinical studies have one primary outcome measure, but some have more than one.
Outcome Measure
Measure Description
Time Frame
The Proportion of Patients Achieving Virologic Responses
Time Frame: Baseline to Day 169
Virologic response is defined as a 1.0-log reduction in quantitative hepatitis B surface antigen (HBsAg) or serologic clearance of HBsAg from Baseline to Day 169
Baseline to Day 169

Secondary Outcome Measures

Secondary Outcome Measures

In a clinical study's protocol, a planned outcome measure that is not as important as the primary outcome measure for evaluating the effect of an intervention but is still of interest. Most clinical studies have more than one secondary outcome measure.
Outcome Measure
Measure Description
Time Frame
The Proportion of Patients Achieving Serologic Clearance of Hepatitis B Surface Antigen (HBsAg) on Day 169
Time Frame: Baseline to Day 169
Baseline to Day 169
The Proportion of Patients Achieving Serologic Clearance of Hepatitis B Virus (HBV) DNA on Day 169
Time Frame: Baseline to Day 169
Baseline to Day 169
Changes in Quantitative HBsAg Level
Time Frame: Baseline to Days 85 and 169
Baseline to Days 85 and 169
Changes in HBV DNA Levels
Time Frame: Baseline to Days 85 and 169
Baseline to Days 85 and 169
Changes in Hepatitis B Core-related Antigen (HBCrAg) Levels
Time Frame: Baseline to Days 85 and 169
Baseline to Days 85 and 169
Changes in Pre-genomic RNA Levels
Time Frame: Baseline to Days 85 and 169
Baseline to Days 85 and 169
Change in IFN-gamma Frequency by ELISpot Assay in PBMCs
Time Frame: Baseline to Days 85 and 169
Percent change in antigen-specific spot forming cells per million peripheral blood mononuclear cells (PBMCs)
Baseline to Days 85 and 169

Collaborators and Investigators

This is where you will find people and organizations involved with this study.

Sponsor

Sponsor

The organization or person who initiates the study and who has authority and control over the study.
Altimmune, Inc.

Study record dates

These dates track the progress of study record and summary results submissions to ClinicalTrials.gov. Study records and reported results are reviewed by the National Library of Medicine (NLM) to make sure they meet specific quality control standards before being posted on the public website.

Study Major Dates

Study Start (Actual)

Study Start

The actual date on which the first participant was enrolled in a clinical study. The "anticipated" study start date is the date that the researchers think will be the study start date.
December 26, 2020

Primary Completion (Actual)

Primary Completion

The date on which the last participant in a clinical study was examined or received an intervention to collect final data for the primary outcome measure. Whether the clinical study ended according to the protocol or was terminated does not affect this date. For clinical studies with more than one primary outcome measure with different completion dates, this term refers to the date on which data collection is completed for all the primary outcome measures. The "anticipated" primary completion date is the date that the researchers think will be the primary completion date for the study.
March 27, 2024

Study Completion (Actual)

Study Completion

The date on which the last participant in a clinical study was examined or received an intervention/treatment to collect final data for the primary outcome measures, secondary outcome measures, and adverse events (that is, the last participant's last visit). The "anticipated" study completion date is the date that the researchers think will be the study completion date.
April 17, 2024

Study Registration Dates

First Submitted

First Submitted

The date on which the study sponsor or investigator first submitted a study record to ClinicalTrials.gov. There is typically a delay of a few days between the first submitted date and the record's availability on ClinicalTrials.gov (the first posted date).
December 22, 2020

First Submitted That Met QC Criteria

First Submitted That Met QC Criteria

The date on which the study sponsor or investigator first submits a study record that is consistent with National Library of Medicine (NLM) quality control (QC) review criteria. The sponsor or investigator may need to revise and submit a study record one or more times before NLM's QC review criteria are met. It is the responsibility of the sponsor or investigator to ensure that the study record is consistent with the NLM QC review criteria.
December 22, 2020

First Posted (Actual)

First Posted

The date on which the study record was first available on ClinicalTrials.gov after National Library of Medicine (NLM) quality control (QC) review has concluded. There is typically a delay of a few days between the date the study sponsor or investigator submitted the study record and the first posted date.
December 28, 2020

Study Record Updates

Last Update Posted (Actual)

Last Update Posted

The most recent date on which changes to a study record were made available on ClinicalTrials.gov. There may be a delay between when the changes were submitted to ClinicalTrials.gov by the study's sponsor or investigator (the last update submitted date) and the last update posted date.
December 8, 2025

Last Update Submitted That Met QC Criteria

Last Update Submitted That Met QC Criteria

The most recent date on which the study sponsor or investigator submitted changes to a study record that are consistent with National Library of Medicine (NLM) quality control (QC) review criteria. It is the responsibility of the sponsor or investigator to ensure that the study record is consistent with the NLM QC review criteria.
December 4, 2025

Last Verified

Last Verified

The most recent date on which the study sponsor or investigator confirmed the information about a clinical study on ClinicalTrials.gov as accurate and current. If a study with a recruitment status of recruiting; not yet recruiting; or active, not recruiting has not been confirmed within the past 2 years, the study's recruitment status is shown as unknown.
December 1, 2025

More Information

Terms related to this study

Keywords

Additional Relevant MeSH Terms

Other Study ID Numbers

Other Study ID Numbers

Identifiers or ID numbers other than the NCT number that are assigned to a clinical study by the study's sponsor, funders, or others. These numbers may include unique identifiers from other trial registries and National Institutes of Health grant numbers.
  • ALT-301-202

Plan for Individual participant data (IPD)

Plan to Share Individual Participant Data (IPD)?

NO

Drug and device information, study documents

Studies a U.S. FDA-regulated drug product

Yes

Studies a U.S. FDA-regulated device product

No

This information was retrieved directly from the website clinicaltrials.gov without any changes. If you have any requests to change, remove or update your study details, please contact register@clinicaltrials.gov. As soon as a change is implemented on clinicaltrials.gov, this will be updated automatically on our website as well.

Cookie Settings

We use cookies to ensure that we give you the best experience on our website. For more details carefully read our Privacy and Cookies Policy. ...>>>You can change your preferences or withdraw your consent at any time by deleting the cookies from your website or computer as described in the policy. Please accept it and choose your preferences by ticking the corresponding boxes in the "Manage Settings" section below. Please carefully read our Terms of Service before you proceed with using any part of this website.
«Manage Settings