- ICH GCP
- US Clinical Trials Registry
- Clinical Trial NCT01658696
Efficacy of Candidate Malaria Vaccines in Senegalese Adults
Efficacy Study of ChAd63-MVA ME-TRAP Prime-boost Vaccination Against Plasmodium Falciparum Infection
Malaria transmission is falling in some parts of Africa as bed nets and anti-malarials become more widely available. However, transmission still persists and it appears that additional control measures are required. The leading malaria vaccine candidate in development is RTS,S which has efficacy against clinical malaria measured at 30-50% in the field. This partial protection might be enhanced by combination with other components. The other vaccination approach that has produced repeatable efficacy in humans is the use of viral vectors to induce T cell responses. Previous attempts with this vaccine approach have been effective in challenge studies in Oxford, but ineffective in the field, probably because of reduced immunogenicity with previous vector platforms.
Recently, studies in Oxford, Kenya and the Gambia have shown higher levels of immunogenicity by using a chimpanzee adenovirus (ChAd63) followed by an attenuated vaccinia virus (modified vaccinia Ankara) to deliver the pre-erythrocytic antigen, multiple epitope string with thrombospondin- related adhesion protein (ME-TRAP).
The increase in immunogenicity has lead to sterile protection in 3 out of 14 volunteers and partial protection in 5 out of 14 volunteers in challenge studies.
The investigators propose a Phase 2b study of 120 healthy adult men in Senegal. The investigators will assess the efficacy and further evaluate the immunogenicity and safety profile of the vaccine regimen. The investigators also intend to assess the correlates of efficacy and natural immunity.
Study Overview
Status
Conditions
Intervention / Treatment
Study Type
Enrollment (Actual)
Phase
- Phase 2
Contacts and Locations
Study Locations
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Dakar, Senegal, BP 5005
- University Cheikh Anta Diop (UCAD)
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Participation Criteria
Eligibility Criteria
Ages Eligible for Study
Accepts Healthy Volunteers
Genders Eligible for Study
Description
Inclusion Criteria:
- Consenting adult males aged 18 - 50 years in good health.
- Will remain resident in the study area for the study duration.
- Able and willing (in the Investigator's opinion) to comply with all study requirements
- Informed Consent
Exclusion Criteria:
- Any significant medical disease, disorder or finding which may significantly increase the risk to the volunteer because of participation in the study, affect the ability of the volunteer to participate in the study or impair interpretation of the study data
- Hypersensitivity to HDCRV,the trial vaccines or the antimalarial used.
- History of allergic disease or reactions likely to be exacerbated by any component of the vaccines, e.g. egg products, kathon, neomycin
- History of splenectomy.
- Haemoglobin less than 10.0 g/dl
- Clinically significant abnormalities of laboratory screening tests (full blood count, ALT, creatinine levels).
- Blood transfusion within the month preceding enrolment.
- History of vaccination with previous experimental malaria vaccines or other vaccines likely to impact on findings of study (e.g. other MVA or adenovirus vectored vaccines)
- Administration of any other vaccine or immunoglobulin within 2 weeks before vaccination.
HIV or Hepatitis B surface antigen seropositivity.
- Current participation in another clinical trial or recent participation within 12 weeks of this study.
- Any other finding which in the opinion of the investigators would increase the risk of an adverse outcome from participation in the trial.
- Likelihood of travel away from the study area
Study Plan
How is the study designed?
Design Details
- Primary Purpose: Prevention
- Allocation: Randomized
- Interventional Model: Parallel Assignment
- Masking: Double
Arms and Interventions
Participant Group / Arm |
Intervention / Treatment |
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Active Comparator: ChAd63 ME-TRAP and MVA ME-TRAP
ChAd63 ME-TRAP / MVA ME-TRAP heterologous prime-boost immunisation
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ChAd63 ME-TRAP: 5 x 10^10vp MVA ME-TRAP: 2 x 10^8 pfu heterologous prime-boost immunisation
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Placebo Comparator: Rabies vaccine
2 x 2.5IU Verorab
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2 x 2.5IU Verorab
Other Names:
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What is the study measuring?
Primary Outcome Measures
Outcome Measure |
Measure Description |
Time Frame |
---|---|---|
Vaccine Efficacy
Time Frame: 18 weeks
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We will compare active and control vaccination for time to first episode of P.falciparum infection, defined as 2 or more consecutive blood samples confirmed positive by PCR, for P.falciparum.
|
18 weeks
|
Secondary Outcome Measures
Outcome Measure |
Measure Description |
Time Frame |
---|---|---|
Vaccine immunogenicity
Time Frame: 24 weeks
|
Measures of immunogenicity will include: Ex vivo ELISPOT responses to overlapping pools of ME - TRAP peptides. 25 Cultured ELISPOT responses to overlapping pools of ME - TRAP peptides. ICS by flow cytometry for cell mediated immune responses ELISA for antibodies to malaria antigens All solicited and unsolicited local and systemic vaccine- linked adverse events (AEs) including clinically significant laboratory abnormalities. |
24 weeks
|
Safety
Time Frame: 24 weeks
|
All solicited and unsolicited local and systemic vaccine- linked adverse events (AEs) including clinically significant laboratory abnormalities.
|
24 weeks
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Other Outcome Measures
Outcome Measure |
Measure Description |
Time Frame |
---|---|---|
Tertiary Endpoint - Metaanalysis of Vaccine Efficacy
Time Frame: 24 weeks
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We will compare combined active vaccination from VAC046 and VAC047, with combined control vaccination from VAC046 and VAC047, for time to first episode of P.falciparum infection, defined as 2 or more consecutive blood samples confirmed positive by PCR for P.falciparum.
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24 weeks
|
Collaborators and Investigators
Sponsor
Study record dates
Study Major Dates
Study Start
Primary Completion (Actual)
Study Completion (Actual)
Study Registration Dates
First Submitted
First Submitted That Met QC Criteria
First Posted (Estimate)
Study Record Updates
Last Update Posted (Estimate)
Last Update Submitted That Met QC Criteria
Last Verified
More Information
Terms related to this study
Additional Relevant MeSH Terms
Other Study ID Numbers
- VAC047
This information was retrieved directly from the website clinicaltrials.gov without any changes. If you have any requests to change, remove or update your study details, please contact register@clinicaltrials.gov. As soon as a change is implemented on clinicaltrials.gov, this will be updated automatically on our website as well.
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