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Safety and Immunogenicity Study of tgAAC09, an HIV Vaccine in an Adeno-associated Virus (AAV) Capsid (TGC14F)

13. december 2012 opdateret af: International AIDS Vaccine Initiative

Phase II, Placebo-controlled, Double-blind, Dose-escalation/Dose-optimization Trial to Evaluate Safety and Immunogenicity of tgAAC09, an HIV Vaccine Containing Clade C Gag-PR-ΔRT DNA in an Adeno-associated Virus (AAV) Capsid

This phase 2 study will evaluate the safety, immunogenicity and optimal timing of two injections at three dose levels of the tgAAC09 vaccine in healthy volunteers. Study volunteers will receive two intramuscular injections of tgAAC09 or placebo at Months 0 and 6 (groups A, C, E and G) or at Months 0 and 12 (groups B, D and F) and be followed for a total of 18 months following the first injection with the exception of group G in which volunteers will be followed for 12 months after the first injection (6 months after the second injection). This study will explore whether boosting is possible, and compare a shorter and more practical six-month time interval with a twelve-month time interval.

Studieoversigt

Detaljeret beskrivelse

The study design will also assess the effect of the presence of anti-AAV2 capsid neutralizing antibodies at the time of vaccination on the safety and immunogenicity of tgAAC09. Since the prevalence of pre-existing neutralizing antibodies to AAV2 capsid is high (IAVI and Targeted Genetics, data on file), this protocol amendment adds Group G which is composed of volunteers who have documented pre-existing anti-AAV2 capsid neutralizing antibodies titers ≤ 1/8. This will assure that there are sufficient numbers of volunteers with and without antibodies for a useful comparison.

Undersøgelsestype

Interventionel

Tilmelding (Faktiske)

91

Fase

  • Fase 2

Kontakter og lokationer

Dette afsnit indeholder kontaktoplysninger for dem, der udfører undersøgelsen, og oplysninger om, hvor denne undersøgelse udføres.

Studiesteder

      • Cape Town, Sydafrika, 7920
        • Desmond Tutu HIV Centre Cape Town
      • South Africa, Sydafrika, 0204
        • Medunsa
      • Soweto, Sydafrika, 2013
        • Perinatal HIV Research Unit, Baragwanath Hospital
      • Entebbe, Uganda
        • Uganda Virus Research Institute
      • Lusaka, Zambia
        • Zambia-Emory HIV Research Project (ZEHRP)

Deltagelseskriterier

Forskere leder efter personer, der passer til en bestemt beskrivelse, kaldet berettigelseskriterier. Nogle eksempler på disse kriterier er en persons generelle helbredstilstand eller tidligere behandlinger.

Berettigelseskriterier

Aldre berettiget til at studere

18 år til 50 år (Voksen)

Tager imod sunde frivillige

Ja

Køn, der er berettiget til at studere

Alle

Beskrivelse

Inclusion Criteria:

  • Healthy male or female
  • Age at least 18 years on the day of screening and no greater than 50 years on the day of the first study injection
  • Willing to comply with the requirements of the protocol and available for follow up for the planned duration of the study
  • Able and willing to give informed consent.
  • Willing to undergo HIV testing, counseling and receive results
  • If sexually active female of child-bearing potential (not menopausal or anatomically sterile), willing to use an effective method of contraception (hormonal contraceptives; intrauterine contraceptive device (IUCD); condoms; anatomical sterility in self or partner) from screening until at least four months after last study injection and willing to undergo urine pregnancy tests at screening, prior to each injection and four months after the last injection
  • If sexually active male, willing to use a method of contraception (such as condoms) from screening until four months after the last study injection

Exclusion Criteria:

  • HIV-1 or HIV-2 infection
  • Active tuberculosis
  • Clinically relevant abnormality on history or examination including history of immunodeficiency, or cancer, or autoimmune disorder
  • Use of systemic corticosteroids, immunosuppressive or anticancer medications in the last six months
  • Chronic condition that, in the opinion of the investigator or the designated trial physician, would make the volunteer unsuitable for the study
  • Any of the following abnormal laboratory parameters:

    • Hemoglobin <9.0 g/dL (females), <12.0 g/dL (males)
    • Absolute Neutrophil Count (ANC): ≤ 999/mm3
    • Absolute Lymphocyte Count (ALC): ≤ 500/mm3
    • Platelets: decreased ≤ 90,000 or increased ≥ 550,000/mm3
    • Creatinine: > 1.4 x ULN
    • AST: >3.0 x ULN
    • ALT: >3.0 x ULN
    • Urine dipstick: blood = 2+ or more (except in menstruating females); protein = 2+ or more
  • Any of the following high-risk behaviors:

    • Had unprotected vaginal or anal sex with a known HIV positive person in the past six months
    • Had unprotected vaginal or anal sex with a casual partner (i.e. no continuing established relationship) in the past six months
    • Engaged in sex work for money or drugs in the past six months
    • Used injection drugs illegally in the past six months
    • Acquired a sexually transmitted infection (STI) in the past six months
  • If female, pregnant, lactating or planning a pregnancy within four months after last study injection
  • Receipt of live attenuated vaccine within 30 days or other vaccine within 14 days of the first study injection
  • Receipt of blood transfusion or blood products six months prior to the first study injection
  • Participation in another clinical trial of an investigational product currently or within last 12 weeks of first study injection or expected participation during this study
  • Prior receipt of an investigational HIV vaccine
  • History of severe local or systemic reaction to vaccination(s) or history of severe allergic reactions
  • History of major neurological or psychiatric disorders
  • Positive for hepatitis B surface antigen, active untreated syphilis (confirmed by treponemal test such as TPHA in addition to nontreponemal test such as RPR) or other active sexually transmitted diseases

Studieplan

Dette afsnit indeholder detaljer om studieplanen, herunder hvordan undersøgelsen er designet, og hvad undersøgelsen måler.

Hvordan er undersøgelsen tilrettelagt?

Design detaljer

  • Primært formål: Forebyggelse
  • Tildeling: Randomiseret
  • Interventionel model: Parallel tildeling
  • Maskning: Firedobbelt

Våben og indgreb

Deltagergruppe / Arm
Intervention / Behandling
Eksperimentel: Group A

Number of Vaccine Recipients: 10

Dosage level 3 x 10^10 DRP

Month 0 + 6

Eksperimentel: Group B

Number of Vaccine Recipients: 10

Dosage level 3 x 10^10 DRP

Month 0+12

Eksperimentel: Group C

Number of Vaccine Recipients: 10

Dosage level 3 x 10^11 DRP

Month 0+6

Eksperimentel: Group D

Number of Vaccine Recipients: 10

Dosage level 3 x 10^11 DRP

Month 0+12

Eksperimentel: Group E

Number of Vaccine Recipients: 10

Dosage level 3 x 10^12 DRP

Month 0+6

Eksperimentel: Group F

Number of Vaccine Recipients: 10

Dosage level 3 x 10^12 DRP

Month 0+12

Eksperimentel: Group G

Number of Vaccine Recipients: 10

Preselected for baseline AAV neutralization titers of <1/8

Dosage level 3 x 10^12 DRP

Month 0+6

Placebo komparator: Placebo
3 volunteers will receive placebo matched to each experimental group.
Sterile isotonic buffered salt solution

Hvad måler undersøgelsen?

Primære resultatmål

Resultatmål
Tidsramme
Safety: proportion of volunteers with severe local and systemic reactions, proportion of volunteers with other SAEs (including laboratory abnormalities) related to study vaccine, number of volunteers with SAEs related to study vaccine
Tidsramme: 18 months
18 months
Proportion of volunteers with HIV-1 specific T- cell responses quantified by γ-IFN ELISPOT and magnitude of the response, and proportion of volunteers with HIV-1 specific binding antibodies and magnitude of the response
Tidsramme: 18 months
18 months

Sekundære resultatmål

Resultatmål
Tidsramme
Safety: high versus low or negative titres of neutralizing antibodies to AAV2 at the time of each vaccination
Tidsramme: 18 months
18 months
Immunogenicity: proportion of volunteers with HIV-1 specific T- cell responses by γ-IFN CFC or other T-cell assays
Tidsramme: 18 months
18 months
Immunogenicity endpoints in volunteers with high versus low or negative titres of neutralizing antibodies to AAV2 at the time of each vaccination
Tidsramme: 18 months
18 months
Immunogenicity endpoints in volunteers with versus without four-fold or greater increase in titres of neutralizing antibodies to AAV2 after vaccination
Tidsramme: 18 months
18 months
Immunogenicity endpoints after the second study injection, compared with the first study injection
Tidsramme: 18 months
18 months
Immunogenicity endpoints after the second study injection following a twelve-month interval compared to a six-month interval
Tidsramme: 18 months
18 months
Vaccine biodistribution: presence and persistence of vaccine in peripheral blood mononuclear cells (PBMC), saliva, nasal swabs, urine and semen or cervical/vaginal secretions
Tidsramme: 18 months
18 months

Samarbejdspartnere og efterforskere

Det er her, du vil finde personer og organisationer, der er involveret i denne undersøgelse.

Samarbejdspartnere

Efterforskere

  • Studiestol: Eftyhia Vardas, MD, Perinatal HIV Research Unit (PHRU), Baragwanath
  • Ledende efterforsker: Linda-Gail Bekker, MD, Desmond Tutu HIV Centre Cape Town
  • Ledende efterforsker: Anwar Hoosen, Medical University of Southern Africa (Medunsa)
  • Ledende efterforsker: Elwyn Chomba, MD, Zambia-Emory HIV Research Project (ZEHRP), Lusaka
  • Ledende efterforsker: Pontiano Kaleebu, MD, PhD, MRC/UVRI and LSHTM Uganda Research Unit

Publikationer og nyttige links

Den person, der er ansvarlig for at indtaste oplysninger om undersøgelsen, leverer frivilligt disse publikationer. Disse kan handle om alt relateret til undersøgelsen.

Hjælpsomme links

Datoer for undersøgelser

Disse datoer sporer fremskridtene for indsendelser af undersøgelsesrekord og resumeresultater til ClinicalTrials.gov. Studieregistreringer og rapporterede resultater gennemgås af National Library of Medicine (NLM) for at sikre, at de opfylder specifikke kvalitetskontrolstandarder, før de offentliggøres på den offentlige hjemmeside.

Studer store datoer

Studiestart

1. oktober 2005

Primær færdiggørelse (Faktiske)

1. december 2007

Studieafslutning (Faktiske)

1. december 2007

Datoer for studieregistrering

Først indsendt

23. april 2009

Først indsendt, der opfyldte QC-kriterier

24. april 2009

Først opslået (Skøn)

27. april 2009

Opdateringer af undersøgelsesjournaler

Sidste opdatering sendt (Skøn)

17. december 2012

Sidste opdatering indsendt, der opfyldte kvalitetskontrolkriterier

13. december 2012

Sidst verificeret

1. december 2012

Mere information

Disse oplysninger blev hentet direkte fra webstedet clinicaltrials.gov uden ændringer. Hvis du har nogen anmodninger om at ændre, fjerne eller opdatere dine undersøgelsesoplysninger, bedes du kontakte register@clinicaltrials.gov. Så snart en ændring er implementeret på clinicaltrials.gov, vil denne også blive opdateret automatisk på vores hjemmeside .

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