Phase I Safety and Immunogenicity Vaccine Trial Against HIV/AIDS (ISST-001)
|First Received Date ICMJE||July 20, 2007|
|Last Updated Date||February 28, 2011|
|Start Date ICMJE||December 2003|
|Primary Completion Date||Not Provided|
|Current Primary Outcome Measures ICMJE
||Assessment of product safety included clinical monitoring of volunteers for local and systemic adverse reactions during the course of the trial and monitoring of haematological, biochemical, virological and immunological parameters|
|Original Primary Outcome Measures ICMJE||Same as current|
|Change History||Complete list of historical versions of study NCT00505401 on ClinicalTrials.gov Archive Site|
|Current Secondary Outcome Measures ICMJE
||To qualify Tat protein as immunogenic, volunteers were monitored for anti-Tat specific antibodies (IgM, IgG, IgA), anti-Tat proliferative response and in vitro γIFN and IL-4 production by PBMC before vaccination and in response to Tat vaccine.|
|Original Secondary Outcome Measures ICMJE||Same as current|
|Current Other Outcome Measures ICMJE||Not Provided|
|Original Other Outcome Measures ICMJE||Not Provided|
|Brief Title ICMJE||Phase I Safety and Immunogenicity Vaccine Trial Against HIV/AIDS|
|Official Title ICMJE||A Phase I Safety and Immunogenicity Trial of Recombinant HIV-1 Tat in HIV-1 Infected Adult Volunteers|
The development of a vaccine against HIV/AIDS has been primary focused on the structural proteins (Env, Gag) of HIV-1 with the aim of inducing sterilizing immunity by blocking virus entry. Alternative approaches are focused on new vaccine strategies aimed at modifying the virus-host dynamic favouring the establishment of a long-term non-progressing disease status. Such strategies target regulatory proteins that are the first to be expressed after infection and are essential for viral replication, infectivity and pathogenesis. Thus, this approach may be effective for both preventive and therapeutic vaccination strategies.
Being a very early viral regulatory protein necessary for viral gene expression, cell-to-cell virus transmission and disease progression, Tat represents a key target protein for the host immune response and an optimal candidate for such a vaccination strategy.
Preclinical studies demonstrated that vaccination with a biologically active Tat protein is safe, elicits a broad and specific immune response and induces a long-term protection against infection. Cross-sectional and longitudinal studies in natural infection suggest that the presence of an anti-Tat humoral immune response correlates with asymptomatic infection and with a slower disease progression while the presence of CD8+ T cell responses to Tat correlate with early virus control both in humans and monkeys. Since the immunogenic regions of Tat are well conserved among the HIV-1 M group, a vaccine based on Tat may be used in different geographic areas of the world.
This Phase I study was directed at evaluating the safety profile (as a primary end-point) and the immunogenicity (as a secondary end-point) of the recombinant HIV-1 Tat vaccine in HIV-1 infected adult volunteers with mild immune deficiency (Clinical category A according to CDC), CD4+ T cell counts 400/mL and levels of plasma viremia < 50,000 copies/mL.
Study Design: Randomized, Double Blind, Placebo Controlled, Safety/Immunogenicity Study.
|Study Type ICMJE||Interventional|
|Study Phase||Phase 1|
|Study Design ICMJE||Allocation: Randomized
Endpoint Classification: Safety/Efficacy Study
Intervention Model: Parallel Assignment
Primary Purpose: Treatment
|Condition ICMJE||HIV Infections|
|Intervention ICMJE||Biological: recombinant HIV-1 Tat protein|
|Study Arm (s)||
* Includes publications given by the data provider as well as publications identified by ClinicalTrials.gov Identifier (NCT Number) in Medline.
|Recruitment Status ICMJE||Completed|
|Completion Date||November 2007|
|Primary Completion Date||Not Provided|
|Eligibility Criteria ICMJE||
|Ages||18 Years to 50 Years|
|Accepts Healthy Volunteers||No|
|Contacts ICMJE||Contact information is only displayed when the study is recruiting subjects|
|Location Countries ICMJE||Italy|
|NCT Number ICMJE||NCT00505401|
|Other Study ID Numbers ICMJE||ISST-001|
|Has Data Monitoring Committee||Yes|
|Responsible Party||Barbara Ensoli, MD, PHD, Istituto Superiore di Sanita|
|Study Sponsor ICMJE||Istituto Superiore di Sanita|
|Collaborators ICMJE||Not Provided|
|Information Provided By||Istituto Superiore di Sanita|
|Verification Date||July 2007|
ICMJE Data element required by the International Committee of Medical Journal Editors and the World Health Organization ICTRP