Hepatitis B
Conditions
Keywords
HBsAg, Persistence of the immune response, Adjuvants
Brief summary
The purpose of this long-term follow-up study was to evaluate the persistence of the cellular and the humoral immune response 4 years after the first dose of GSK Biologicals' investigational vaccine formulations containing HBsAg (used as a model antigen) and an adjuvant.
Detailed description
Subjects in this long-term follow-up study were recruited among those subjects who completed the study 287615 (NCT00508833) and who were enrolled in specific groups. All subjects were vaccinated in the study 287615 (NCT00508833) according to a 0, 1, 10 month schedule. No new subjects were enrolled and no vaccine was administered in this long-term follow-up study. There was a single visit at Year 4 at which blood samples for immunogenicity assays were taken.
Interventions
PROCEDUREBlood Sampling
Single blood sample taken from subjects who had participated in the study 287615 (NCT00508833).
Sponsors
GlaxoSmithKline
Study design
Allocation
RANDOMIZED
Intervention model
PARALLEL
Primary purpose
PREVENTION
Masking
NONE
Eligibility
Sex/Gender
ALL
Age
22 Years to 45 Years
Healthy volunteers
Yes
Inclusion criteria
* Subjects who the investigator believes can and will comply with the requirements of the protocol. * Subjects who took part in and completed study 287615 (NCT00508833). * Written informed consent obtained from the subject. * Healthy subjects as established by medical history before entering into the study.
Exclusion criteria
* Use of any investigational or non-registered product other than the study vaccine(s) within 30 days preceding the blood sampling, or planned use during the study period. * Chronic administration of immunosuppressants or other immune-modifying drugs within three months prior to the blood sampling. * Administration of immunoglobulins within the three months preceding the blood sampling or planned administration during the study period. * Pregnant or lactating female. * Documented HIV-positive subject.
Design outcomes
Primary
| Measure | Time frame | Description |
|---|---|---|
| Frequency of CD4 and CD8 T cells expressing IFN-γ and/or TNF-α and/or IL-2 and/or CD40L upon short term in vitro stimulation with HbsAg derived peptides using cytokine flow cytometry. | Week 48. | The blood samples at Week 48 were taken during the primary study 287615 (NCT00508833). |
Secondary
| Measure | Time frame | Description |
|---|---|---|
| Anti-HBs antibody titres as measured by ELISA. | Week, 48, Week 78, Year 4. | The blood samples at Week 48 and Week 78 were taken during the primary study 287615 (NCT00508833). |
| Exploratory analysis of proteins and low molecular weight biomolecules in the serum using ELISA and other techniques to be defined. | Day 0, Day 1. | The blood samples at Day 0 and Day 1 were taken during the primary study 287615 (NCT00508833). |
| Frequency of HBsAg specific memory B cells by B Cell Elispot assay. | Week 48, Week 78, Year 4. | The blood samples at Week 48 and Week 78 were taken during the primary study 287615 (NCT00508833). |
| Frequency of HBs-specific or non specific T regulatory cells using cytokine flow cytometry and other techniques to be defined. | Day 0, Week 6, Week 46, Week 48. | The blood samples at Day 0, Week 6, Week 46 and Week 48 were taken during the primary study 287615 (NCT00508833). |
Countries
Belgium
Outcome results
None listed