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TherVacB – A multi-center phase 1b/2a trial to assess safety, tolerability and immunogenicity of a heterologous protein prime/MVA boost therapeutic hepatitis B vaccine candidate

Status
Recruiting
Phases
Phase 1Phase 2
Study type
Interventional
Source
EU CTIS
Registry ID
CTIS2023-507623-36-00
Acronym
TherVacB_1b2a_1
Enrollment
59
Registered
2024-05-13
Start date
2025-05-26
Completion date
Unknown
Last updated
2025-12-15

For informational purposes only — not medical advice. Sourced from public registries and may not reflect the latest updates. Terms

Conditions

Chronic hepatitis B

Brief summary

Frequencies and magnitudes of unsolicited adverse events, Frequencies and magnitudes of serious adverse events (SAEs), Frequencies and magnitudes of adverse events of special interest (AESI) and Suspected Unexpected Serious Adverse Reactions (SUSAR), Frequencies and magnitudes of solicited local reactogenicity signs and symptoms within 7 days after each vaccination, Frequencies and magnitudes of solicited systemic reactogenicity signs and symptoms within 7 days after each vaccination, Frequencies and magnitudes of liver toxicity (ALT flare-ups) stratified by severity, Change from baseline of safety laboratory measurements

Detailed description

Frequency of subjects with HBsAg drop below the lower limit of quantification, Frequency of subjects with a ≥ 1 log10 drop in HBsAg titers from day 0 (start of study medication) with the goal of 30% of patients achieving a ≥ 1log10 HBsAg drop, Frequency of subjects with an induction of anti-HBs titers ≥10 IU/L, Frequency of subjects developing any anti-HBs antibody response, Frequency of subjects with an increased signal in the HBV-specific cytokine-secretion assay compared to pretreatment values, Frequency of subjects with an increased frequency of total HBV-specific, cytokine-secreting T cells compared to pretreatment values, Frequency of subjects developing an immune response to TherVacB treatment arms A5, A6 or B4 with the goal of ≥ 30% of patients developing anti-HBs antibody or T-cell responses

Interventions

None listed

Sponsors

Klinikum der Universitaet Muenchen AöR
Lead SponsorOTHER

Eligibility

Sex/Gender
All
Age
18 Years to No maximum

Design outcomes

Primary

MeasureTime frame
Frequencies and magnitudes of unsolicited adverse events, Frequencies and magnitudes of serious adverse events (SAEs), Frequencies and magnitudes of adverse events of special interest (AESI) and Suspected Unexpected Serious Adverse Reactions (SUSAR), Frequencies and magnitudes of solicited local reactogenicity signs and symptoms within 7 days after each vaccination, Frequencies and magnitudes of solicited systemic reactogenicity signs and symptoms within 7 days after each vaccination, Frequencies and magnitudes of liver toxicity (ALT flare-ups) stratified by severity, Change from baseline of safety laboratory measurements

Secondary

MeasureTime frame
Frequency of subjects with HBsAg drop below the lower limit of quantification, Frequency of subjects with a ≥ 1 log10 drop in HBsAg titers from day 0 (start of study medication) with the goal of 30% of patients achieving a ≥ 1log10 HBsAg drop, Frequency of subjects with an induction of anti-HBs titers ≥10 IU/L, Frequency of subjects developing any anti-HBs antibody response, Frequency of subjects with an increased signal in the HBV-specific cytokine-secretion assay compared to pretreatment values, Frequency of subjects with an increased frequency of total HBV-specific, cytokine-secreting T cells compared to pretreatment values, Frequency of subjects developing an immune response to TherVacB treatment arms A5, A6 or B4 with the goal of ≥ 30% of patients developing anti-HBs antibody or T-cell responses

Countries

Germany

Outcome results

None listed

Source: EU CTIS · Data processed: Feb 4, 2026