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L'essai clinique NCT06958198 (VAC093) pour Paludisme à falciparum est en recrutement. Consultez la vue en carte du Radar des Essais Cliniques et les outils de découverte par IA pour tous les détails, ou posez vos questions ici.
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A Study to Assess the Experimental Malaria Vaccines R78C and RH5.1 Combined With R21/Matrix-M (a "Multi-stage" Malaria Vaccine) (VAC093)

En recrutement
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L'essai clinique NCT06958198 (VAC093) est conçu pour étudier la prevention de Paludisme à falciparum. Il s'agit d'un essai interventionnel en Phase I. Son statut actuel est : en recrutement. L'essai a débuté le 15 septembre 2025 et vise à recruter 56 participants. Dirigé par l'Université d'Oxford, l'essai devrait être terminé d'ici le 1 octobre 2026. Les données du site ClinicalTrials.gov ont été mises à jour pour la dernière fois le 18 novembre 2025.
Résumé succinct
This is a Phase Ib age de-escalation, dose escalation, open-label study to assess the safety and immunogenicity of the multi-stage malaria vaccine candidate R21 plus RH5.1 and/or R78C in Matrix-M in adults aged 18-35 years and children aged 5-17 months in Burkina Faso.
Description détaillée
There will be six study groups. Group 1 will consist of 8 adults who will receive three doses of 5 µg R21 + 10 µg RH5.1 + 10 µg R78C. Group 2 will consist of 8 children who will receive three doses of 5 µg R21 + 10 µg RH5.1. Group 3 will consist of 8 children who will receive three doses of 5 µg R21 + 10 µg R78C. Group 4 will consist of 8 children who will receive three doses of 5 µg R21 + 10 µg RH5.1 +10 µg R78C. Group 5 will consist of 8 children who will receive three doses of 5 µg R21. Group 6 will consist of 16 children who will receive three doses of 10 µg RH5.1 +10 µg R78C. All vaccinations will be given in 50 µg Matrix-M. All groups will receive their vaccinations in a 0-1-6 month regimen.

Groups 1 to 4 and 6 will be recruited in a staggered process. There will be a DSMB review prior to age deescalation. There will also be three sentinel participants per group and DSMB reviews prior to each subsequent (second and third) vaccination. Group 5 can be recruited at any time and without need for sentinel participants or DSMB review.

Titre officiel

A Phase Ib Age De-escalation, Open Label Study of the Safety and Immunogenicity of the Multi-stage Malaria Vaccine Candidate R21 + RH5.1 + R78C in Matrix-M™ in Adults Aged 18-35 Years and Children Aged 5-17 Months in Burkina Faso

Conditions
Paludisme à falciparum
Autres identifiants de l'essai
  • VAC093
Numéro NCT
Date de début (réel)
2025-09-15
Dernière mise à jour publiée
2025-11-18
Date de fin (estimée)
2026-10
Inscription (estimée)
56
Type d'essai
Interventionnel
PHASE
Phase I
Statut
En recrutement
Objectif principal
Prévention
Plan d'attribution
Non aléatoire
Modèle d'intervention
Parallèle
Masquage
Aucun (ouvert)
Bras / Interventions
Groupe de participants/BrasIntervention/Traitement
ExpérimentalGroup 1(n=8) adults (18-35years)
They will receive three doses of 5 µg R21 + 10 µg RH5.1 + 10 µg R78C, administered at Month 0 (Day 0), Month 1 (Day 28), and Month 6 (Day 182), given as an Intramuscular injection to the deltoid region (adults) or anterolateral thigh (children)
R21
A protein particle comprising recombinant HBsAg fused to the central repeat and the C-terminus of the circumsporozoite protein
RH5.1
A soluble protein vaccine against the RH5 antigen
R78C
A soluble RIPR EGF-CyRPA fusion protein vaccine
Matrix-m™
A saponin-based vaccine adjuvant
ExpérimentalGroup 2 (n=8) Children aged between 5-17months
They will receive three doses of 5 µg R21 + 10 µg RH5.1, administered at Month 0 (Day 0), Month 1 (Day 28), and Month 6 (Day 182), given as an Intramuscular injection to the deltoid region (adults) or anterolateral thigh (children)
R21
A protein particle comprising recombinant HBsAg fused to the central repeat and the C-terminus of the circumsporozoite protein
RH5.1
A soluble protein vaccine against the RH5 antigen
Matrix-m™
A saponin-based vaccine adjuvant
ExpérimentalGroup 3 (n=8) children aged between 5-17 months
They will receive three doses of 5 µg R21 + 10 µg R78C, administered at Month 0 (Day 0), Month 1 (Day 28), and Month 6 (Day 182), given as an Intramuscular injection to the deltoid region (adults) or anterolateral thigh (children)
R21
A protein particle comprising recombinant HBsAg fused to the central repeat and the C-terminus of the circumsporozoite protein
R78C
A soluble RIPR EGF-CyRPA fusion protein vaccine
Matrix-m™
A saponin-based vaccine adjuvant
ExpérimentalGroup 4 (n=8) Children aged between 5-17 months
They will receive three doses of 5 µg R21 + 10 µg RH5.1 +10 µg R78C , administered at Month 0 (Day 0), Month 1 (Day 28), and Month 6 (Day 182), given as an Intramuscular injection to the deltoid region (adults) or anterolateral thigh (children)
R21
A protein particle comprising recombinant HBsAg fused to the central repeat and the C-terminus of the circumsporozoite protein
RH5.1
A soluble protein vaccine against the RH5 antigen
R78C
A soluble RIPR EGF-CyRPA fusion protein vaccine
Matrix-m™
A saponin-based vaccine adjuvant
ExpérimentalGroup 5 (n=8) children aged 5-17 months
They will receive three doses of 5 µg R21, administered at Month 0 (Day 0), Month 1 (Day 28), and Month 6 (Day 182), given as an Intramuscular injection to the deltoid region (adults) or anterolateral thigh (children)
R21
A protein particle comprising recombinant HBsAg fused to the central repeat and the C-terminus of the circumsporozoite protein
Matrix-m™
A saponin-based vaccine adjuvant
ExpérimentalGroup 6 ( n=16) Children 5-17 months
They will receive three doses of 10 µg RH5.1 +10 µg R78C, administered at Month 0 (Day 0), Month 1 (Day 28), and Month 6 (Day 182), given as an Intramuscular injection to the deltoid region (adults) or anterolateral thigh (children)
RH5.1
A soluble protein vaccine against the RH5 antigen
R78C
A soluble RIPR EGF-CyRPA fusion protein vaccine
Matrix-m™
A saponin-based vaccine adjuvant
Critère principal d'évaluation
Critères d'évaluationDescription de critèresPériode
Safety: To assess the safety and reactogenicity of R21, RH5.1 and R78C in Matrix-M™ when used in different combinations in healthy adults and children living in a malaria-endemic area.
The specific endpoints for safety and reactogenicity will be actively and passively collected data on adverse events. The following parameters will be assessed: * Occurrence of solicited local reactogenicity signs and symptoms for 7 days following each vaccination (day of vaccination and 6 subsequent days) * Occurrence of solicited systemic reactogenicity signs and symptoms for 7 days following each vaccination (day of vaccination and 6 subsequent days) * Occurrence of unsolicited adverse events for 28 days following the vaccination (day of vaccination and 27 subsequent days) * Clinically significant change from baseline for safety laboratory measures throughout the study * Occurrence of serious adverse events during the whole study duration.
Solicited AEs will be assessed at Day 0, Days 1-6, 28, days 29-34, 182 and days 187. Unsolicited AEs on Day 0, Days 1-6, 14, 28, Days 29-34, 42, 56, 182, Days 183-187 and 196. All SAEs will be assessed throughout the study follow up period upto Day 365
Critère secondaire d'évaluation
Critères d'évaluationDescription de critèresPériode
Immunogenicity: To assess the humoral immunogenicity of R21, RH5.1 and R78C in Matrix-M™ when used in different combinations in healthy adults and children living in a malaria-endemic area.
Immunogenicity will be assessed by a variety of immunological assays. The following measures will be assessed: * Serum response: o Quantitative antigen-specific IgG antibody levels (µg/mL readout) over time - analysis of peak responses and longevity; * In vitro GIA against 3D7 clone P. falciparum parasites using purified total IgG and a single-cycle pLDH readout assay
Immunology blood samples will be collected at screening, day of vaccination, at Days 42, 56, 182, 196, 210, 240, and 365.
Critères d'éligibilité

Âges éligibles
Enfant, Adulte
Âge minimum
5 Months
Sexes éligibles
Tous
Accepte les volontaires en bonne santé
Oui

Only participants who meet all the inclusion criteria will be enrolled into the trial:

  • Group 1: Healthy adult aged 18-35 years at the time of first study vaccination
  • Group 2-6: Healthy child aged 5-17 months at the time of first study vaccination
  • Group 1: Female participants must be non-pregnant (as demonstrated by a negative urine pregnancy .

test), and practice continuous effective contraception until three months after the final study vaccination

  • Participant or parent/guardian provides signed/thumb-printed informed consent
  • Participant (and parent/guardian for child participants) resident in the study area villages, and anticipated to be available for vaccination and the duration of follow-up -

  • The participant may not enter the trial if ANY of the following apply:

    • Clinically significant congenital abnormalities as judged by the PI or other delegated individual.
    • Clinically significant skin disorder (psoriasis, contact dermatitis, etc.), cardiovascular disease, respiratory disease, endocrine disorder, liver disease, renal disease, gastrointestinal disease, neurological illness as judged by the PI or other delegated individual.
    • History of cancer (except basal cell carcinoma of the skin and cervical carcinoma in situ).
    • Children with weight-for-age Z score of less than -3 or other clinical signs of malnutrition.
    • History of allergic reaction, significant IgE-mediated event, or anaphylaxis to immunisation.
    • History of allergic disease or reactions likely to be exacerbated by any component of the vaccines.
    • Sickle cell disease.
    • Clinically significant laboratory abnormality at grade 2 or above as judged by the PI or other delegated individual.
    • Administration of immunoglobulins and/or any blood products within the three months preceding the planned administration of the vaccine candidate.
    • Receipt of any vaccine in the 14 days preceding enrolment, or planned receipt of any other vaccine within 28 days following each study vaccination.
    • History of vaccination with any malaria vaccine.
    • Participation in another research study involving receipt of an investigational product in the 30 days preceding enrolment, or planned use during the study period.
    • Suspected or known current alcohol misuse.
    • Suspected or known injecting drug use in the 5 years preceding enrolment.
    • Female participant who is pregnant, lactating or planning pregnancy during the course of the trial.
    • Scheduled elective surgery or other procedures requiring general anaesthesia during the trial.
    • Seropositive for hepatitis B surface antigen (HBsAg), hepatitis C (HCV IgG) or HIV. For children, any history of vertical exposure to HIV infection.
    • Any confirmed or suspected immunosuppressive or immunodeficient state, including HIV infection; asplenia; recurrent, severe infections and chronic (more than 14 days) immunosuppressant medication within the past 6 months (for corticosteroids, this will mean prednisone, or equivalent, ≥ 0.5 mg/kg/day; inhaled and topical steroids are allowed).
    • Any significant disease, disorder or situation which, in the opinion of the Investigator, may either put the participants at risk because of participation in the trial, or may influence the result of the trial, or the participant's ability to participate in the trial.

Vaccination and re-vaccination exclusion criteria:

The following adverse events associated with vaccine immunisation constitute absolute contraindications to further administration of vaccine. If any of these events occur during the study, the participant must be withdrawn and followed until resolution of the event, as with any adverse event:

  • Anaphylactic reaction following administration of vaccine.
  • Pregnancy.

The following adverse events constitute contraindications to administration of vaccine at that point in time; if any one of these adverse events occurs at the time scheduled for vaccination, the participant may be vaccinated at a later date, or withdrawn at the discretion of the Investigator. The participant must be followed until resolution of the event as with any adverse event:

  • Acute disease at the time of vaccination (acute disease is defined as the presence of a moderate or severe illness with or without fever or symptoms suggestive of possible COVID-19 disease). All vaccines can be administered to persons with a minor illness such as diarrhoea or mild upper respiratory infection without fever, i.e. axillary temperature < 37.5°C.
  • Temperature of >37.5°C (99.5°F) at the time of vaccination.
  • 🏛️Institut de Recherche en Sciences de la Sante, Burkina Faso
  • 🏥European and Developing Countries Clinical Trials Partnership (EDCTP)
  • 🏢Wellcome Trust
  • 💉European Vaccine Initiative (EVI)
  • 🏛️Bundesministerium für Forschung, Technologie und Raumfahrt (BMFTR)
Contact central de l'essai
Contact: Naomi N Kamau, +44 (0)1865611418, [email protected]
Contact: Angela Minassian, Honorary Consultant and CI
1 Centres de l'essai dans 1 pays

Boulkiemdé Province

Institut de Recherche en Sciences de la Santé, Siglé, Boulkiemdé Province, BP 7192 OUAGADOUGOU 03, BF, Burkina Faso
Dr Athanase M. Somé, Doctorat en médecine, Contact, 25446249, [email protected]
Dr Ousmane Traoré, Investigateur associé
Dr Salou Diallo, Investigateur associé
Dr Toussaint Rouamba, Investigateur associé
Prof. Halidou Tinto, Investigateur principal
En recrutement