Safety, Immunogenicity, and Impact of MVA85A, on the Immunogenicity of the EPI Vaccines

NCT ID: NCT00480454

Last Updated: 2010-02-09

Basic Information

• Recruitment Status: COMPLETED
• Clinical Phase: PHASE1
• Total Enrollment: 214 participants
• Study Classification: INTERVENTIONAL
• Study Start Date: 2006-10-31
• Study Completion Date: 2009-12-31

Brief Summary

This study is preliminary to proving that this vaccine could protect against tuberculosis in humans. Although there is no proven data to show that infants will benefit directly from participation in this study by being protected against TB, MVA85A protection of mice, guinea pigs and monkeys against tuberculosis is encouraging. It is hoped that the information gained from this study will contribute to the development of a safe and effective TB vaccine for HIV negative and positive individuals. Participants in this study will benefit by having information about their general health status, and the rigorous follow up visit that could enhance early detection and management of medical conditions that might arise in the course of the study.

Detailed Description

Over the last 3 years Phase I studies with MVA85A allowed for sequential vaccination of volunteer groups with a step-wise increase in mycobacterial exposure, to minimize the possibility of a Koch reaction. Trials were also conducted sequentially in the UK and The Gambia, as there is a greater degree of exposure to both environmental mycobacteria and M.tb in The Gambia. A Koch reaction describes the development of immunopathology in a person or animal with tuberculosis, when an exaggerated immune response to M.tb is stimulated. It has now been demonstrated in the mouse model of therapeutic vaccination (Taylor et al, 2003). Available animal data suggest that these reactions do not occur in mice latently infected with M.tb, suggesting that such reactions may correlate with high bacterial load and that the Koch phenomenon may not pose a problem for vaccination of healthy albeit latently infected humans (Taylor et al, 2003).

In the UK, 14 mycobacterially and BCG naïve, healthy volunteers were vaccinated twice with 5 x 107pfu MVA85A, administered intradermally at 3 week intervals. MVA85A was found to be safe and well tolerated. A single vaccination with MVA85A induced remarkably high levels of specific effector T cell responses 1 week after vaccination (mean γ IFN Elispot response to PPD was 460 spots per million PBMC). MVA85A was also safe in 17 volunteers vaccinated with BCG in the previous 0.5-37 years. The safety profile of MVA85A in these 17 volunteers was the same as in the BCG naïve group. Interestingly, these 17 volunteers showed even higher peak levels of antigen specific T cells (mean response to PPD was 917 spots per million PBMC) 1 week post-vaccination than those immunized with MVA85A alone. Perhaps more importantly for the induction of T cell memory, these volunteers who were previously BCG vaccinated maintained significantly higher levels of antigen specific T cells after MVA85A for up to 24 weeks after vaccination, when compared to those volunteers vaccinated with either BCG or MVA85A alone (McShane et al, 2004). The next trial in the UK looked at the boosting efficacy of MVA85A when administered one month after BCG vaccination. 10 healthy, BCG naïve volunteers were vaccinated with BCG and one month later were boosted with MVA85A. Safety and boosting efficacy was comparable to the previous trial where the interval between BCG and MVA85A was 0.5-37 years.

2.3.2 Gambian studies Following the success of the trials with MVA85A in the UK, a collaboration with the MRC unit in The Gambia was initiated. MVA85A was first evaluated in Phase I clinical trials in BCG naïve subjects (n = 11) and subsequently in BCG primed subjects (n=10). In these studies the safety and immunogenicity profile is comparable to that seen in the UK studies. In both the UK and The Gambian studies, MVA85A induces 5-10 fold higher immune responses than any other recombinant MVA in clinical trials. The most likely explanation for this is that the volunteers have some weak pre-existing anti-mycobacterial immunity induced by exposure to environmental mycobacteria, and this is being boosted by vaccination with MVA85A. When MVA85A is administered to BCG naïve subjects in the Gambia, the magnitude and kinetics of response resemble the BCG primed group in the UK, a finding that is likely to represent a greater degree of environmental priming in tropical climates.

Taken together, over 600 people, including HIV positive and over 250 Gambian adults and children, have now been immunised with various recombinant MVA investigational vaccines including constructs expressing malaria, HIV, hepatitis B and melanoma antigens without significant adverse reactions (Hill, unpublished data). Furthermore, 190 children aged 1-5 years were vaccinated with a recombinant MVA expressing a malarial antigen in 2006, with no vaccine related SAEs (Hill, personal communication). This safety data now allows for progression to testing MVA85A in a phase II study in infants who have been vaccinated with BCG, in a Gambian population which may include low numbers of latently M.tb infected and HIV positive children.

It is important to test the safety, immunogenicity, and possible interference (detrimental, none or beneficial) with other EPI vaccines of the MVA85A vaccine in such a group, which is one of the potential target populations for a large-scale efficacy study. Also the effects of simultaneous EPI vaccine administration on the immunogenicity of MVA85A need to be evaluated.

Conditions

TB

Study Design

• Allocation Method: RANDOMIZED
• Intervention Model: SINGLE_GROUP
• Primary Study Purpose: PREVENTION
• Blinding Strategy: NONE

Study Groups

1

Stage 1 would require 12 per group low dose and 12 per group high dose (total 72)

Group Type: ACTIVE_COMPARATOR

MVA 85A

Intervention Type: BIOLOGICAL

intradermal vaccine

2

Stage 2 would require 48 per group (total 144)

Group Type: ACTIVE_COMPARATOR

MVA 85A

Intervention Type: BIOLOGICAL

intradermal vaccine

Interventions

MVA 85A

intradermal vaccine

Intervention Type: BIOLOGICAL

Other Intervention Names

TB vaccine; modified vaccinia virus Ankara

Eligibility Criteria

Inclusion Criteria

• Healthy infants aged 2 - 3 months
• Recorded BCG vaccination within first two weeks of life with typical BCG scar on the left arm
• Receiving standard EPI immunizations according to national immunization programme (DTwPHib at 2/3/4 months, OPV at birth, 1, 2 and 3 months, Hep B at birth, 2 & 4 months)
• Written informed consent by parent / guardian

Exclusion Criteria

• Any clinically significant abnormal finding on screening from biochemistry or haematology
• Any AIDS defining illness
• Prior receipt of a recombinant MVA or Fowlpox vaccine, or other experimental vaccine
• Use of any investigational or non-registered drug, live vaccine or medical device other than the study vaccine within 2 weeks preceding dosing of study vaccine, or planned use during the study period
• Administration of chronic (defined as more than 14 days) immunosuppressive drugs or other immune modifying drugs within 6 months of vaccination. (For corticosteroids, this will mean prednisolone, or equivalent, ≥ 0.5 mg/kg/day. Inhaled and topical steroids are allowed.)
• History of allergic disease or reactions likely to be exacerbated by any component of the vaccine, e.g. egg products
• Presence of any underlying disease that compromises the diagnosis and evaluation of response to the vaccine
• History of > 2 hospitalisations for invasive bacterial infections (pneumonia, meningitis)
• Any other on-going chronic illness requiring hospital specialist supervision
• Administration of immunoglobulins and/or any blood products within one month preceding the planned administration of the vaccine candidate
• Any history of anaphylaxis in reaction to vaccination
• Research Physician's assessment of lack of willingness by parents to participate and comply with all requirements of the protocol, or identification of any factor felt to significantly increase the infant's risk of suffering an adverse outcome
• Likelihood of travel away from the study area
• Untreated malaria infection

• Minimum Eligible Age: 2 Months
• Maximum Eligible Age: 3 Months
• Eligible Sex: ALL
• Accepts Healthy Volunteers: Yes

Sponsors

Medical Research Council

OTHER_GOV

Sponsor Role: collaborator

University of Oxford

OTHER

Sponsor Role: lead

Responsible Party

University of Oxford

Principal Investigators

Helen McShane

Role: PRINCIPAL_INVESTIGATOR

University of Oxford

Locations

MRC

Banjul, , The Gambia

Countries

The Gambia

References

McShane H, Pathan AA, Sander CR, Keating SM, Gilbert SC, Huygen K, Fletcher HA, Hill AV. Recombinant modified vaccinia virus Ankara expressing antigen 85A boosts BCG-primed and naturally acquired antimycobacterial immunity in humans. Nat Med. 2004 Nov;10(11):1240-4. doi: 10.1038/nm1128. Epub 2004 Oct 24.

Reference Type: BACKGROUND

PMID: 15502839 (View on PubMed)

Goonetilleke NP, McShane H, Hannan CM, Anderson RJ, Brookes RH, Hill AV. Enhanced immunogenicity and protective efficacy against Mycobacterium tuberculosis of bacille Calmette-Guerin vaccine using mucosal administration and boosting with a recombinant modified vaccinia virus Ankara. J Immunol. 2003 Aug 1;171(3):1602-9. doi: 10.4049/jimmunol.171.3.1602.

Reference Type: BACKGROUND

PMID: 12874255 (View on PubMed)

Bejon P, Peshu N, Gilbert SC, Lowe BS, Molyneux CS, Forsdyke J, Lang T, Hill AV, Marsh K. Safety profile of the viral vectors of attenuated fowlpox strain FP9 and modified vaccinia virus Ankara recombinant for either of 2 preerythrocytic malaria antigens, ME-TRAP or the circumsporozoite protein, in children and adults in Kenya. Clin Infect Dis. 2006 Apr 15;42(8):1102-10. doi: 10.1086/501459. Epub 2006 Mar 14.

Reference Type: BACKGROUND

PMID: 16575727 (View on PubMed)

Huygen K, Content J, Denis O, Montgomery DL, Yawman AM, Deck RR, DeWitt CM, Orme IM, Baldwin S, D'Souza C, Drowart A, Lozes E, Vandenbussche P, Van Vooren JP, Liu MA, Ulmer JB. Immunogenicity and protective efficacy of a tuberculosis DNA vaccine. Nat Med. 1996 Aug;2(8):893-8. doi: 10.1038/nm0896-893.

Reference Type: BACKGROUND

PMID: 8705859 (View on PubMed)

Other Identifiers

TB012

Identifier Type: -

Identifier Source: org_study_id