Pan African Clinical Trials Registry

South African Medical Research Council, South African Cochrane Centre
PO Box 19070, Tygerberg, 7505, South Africa
Telephone: +27 21 938 0506 / +27 21 938 0834 Fax: +27 21 938 0836
Email: pactradmin@mrc.ac.za Website: pactr.samrc.ac.za
Trial no.: PACTR202201848463189 Date of Approval: 21/01/2022
Trial Status: Registered in accordance with WHO and ICMJE standards
TRIAL DESCRIPTION
Public title Phase 1 Dose Escalating, Double-Blind, Randomised Comparator Controlled Trial of the Safety and Immunogenicity of Different Adjuvant Formulations of R0.6C and ProC6C transmission blocking vaccines candidates against Plasmodium falciparum in Adults in Burkina Faso (TBVax1)
Official scientific title Phase 1 Dose Escalating, Double-Blind, Randomised Comparator Controlled Trial of the Safety and Immunogenicity of Different Adjuvant Formulations of R0.6C and ProC6C transmission blocking vaccines candidates against Plasmodium falciparum in Adults in Burkina Faso (TBVax1)
Brief summary describing the background and objectives of the trial Malaria, a disease caused by Plasmodium parasites, is one of the most important infectious diseases worldwide. After a period of success in global malaria control, progress has stalled in 2015-2018. The availability of a transmission blocking vaccine would be a critical step to move towards malaria elimination [1, 2]. The R0.6C fusion protein, consisting of the N-terminal region of Glutamate Rich Protein GLURP (R0) and the 6-cysteine C-terminal fragment of the well-established Pfs48/45 antigen (6C). The ProC6C-AlOH Vaccine is composed of ProC6C recombinant protein (0.2 mg/ml of the recombinant protein together with 1.6 mg/ml Alhydrogel®. The vaccine is supplied in sterile 2 mL Type I glass vials. Each vial contains a total volume of 0.8 mL. Both are lead candidates for a transmission blocking vaccine. Primary Objective 1) To evaluate the safety and reactogenicity of R0.6C and ProC6C immunizations in healthy malaria-exposed volunteers in three doses adjuvant combinations. 2) To assess transmission reducing activity to mosquitoes in the standard membrane feeding assay of sera after full course of R0.6C and ProC6C immunizations in three doses adjuvant combinations Secondary objective 1) To assess the dynamics of transmission reducing activity in the standard membrane feeding assay of sera collected during and after R0.6C and ProC6C immunizations in three doses adjuvant combinations 2) To assess the dynamics of anti-6C antibody quantities during and after R0.6C and ProC6C immunizations in three doses adjuvant combinations Exploratory Objectives: 1) To estimate antibody levels against the immunogens and constituent antigens (e.g. R0, Pfs4845-6C, Pfs230-Pro, CSP) at all timepoints and dose adjuvant combinations. 2) To explore parasite, host genetics and functional antibody responses to R0.6C and ProC6C
Type of trial RCT
Acronym (If the trial has an acronym then please provide) TBVax1
Disease(s) or condition(s) being studied Infections and Infestations
Sub-Disease(s) or condition(s) being studied Malaria
Purpose of the trial Prevention: Vaccines
Anticipated trial start date 01/02/2022
Actual trial start date
Anticipated date of last follow up 30/11/2022
Actual Last follow-up date
Anticipated target sample size (number of participants) 125
Actual target sample size (number of participants)
Recruitment status Recruiting
Publication URL
Secondary Ids Issuing authority/Trial register
STUDY DESIGN
Intervention assignment Allocation to intervention If randomised, describe how the allocation sequence was generated Describe how the allocation sequence/code was concealed from the person allocating the participants to the intervention arms Masking If masking / blinding was used
Parallel: different groups receive different interventions at same time during study Randomised Permuted block randomization Sealed opaque envelopes Masking/blinding used Care giver/Provider,Outcome Assessors,Participants
INTERVENTIONS
Intervention type Intervention name Dose Duration Intervention description Group size Nature of control
Experimental Group R0.6C and ProC6C transmission blocking vaccines Each participant will receive 3 doses, one month apart. There are two cohorts. Cohort 1 (low dose) 1A n=5 3x 30µg R0.6C-AlOH 1B n=5 3x 30µg R0.6C-AlOH+Matrix-M 1C n=5 3x 30µg ProC6C-AlOH 1D n=5 3x 30µg ProC6C-AlOH+Matrix-M 1E n=5 3x Hepatitis B vaccine Cohort 2 (high dose) 2A n=20 3x 100µg R0.6C-AlO 2B n=20 3x 100µg R0.6C-AlOH+Matrix-M 2C n=20 3x 100µg ProC6C-AlOH 2D n=20 3x 100µg ProC6C-AlOH+Matrix-M 2E n=20 3x Hepatitis B vaccine 10 months The study is a first-in-human phase Ib, double blind randomized controlled, dose escalation study which will include healthy, malaria exposed adults (males and females), aged 20 – 45 years. Each of the study arms will receive three intramuscular vaccinations on days 0, 28, 56 with R0.6C or ProC6C adsorbed to AlOH alone, or combined with an additional adjuvant Matrix-M. Dose escalation with the two adjuvant arms will be staggered starting with the lower dose group. The high dose cohorts will only start after cumulative safety from the first two doses in the low dose cohorts have been reviewed by the DSMB. Within each dose level, enrolment of participants will be staggered. 95
Control Group Hepatitis B vaccine three doses, one month apart 10 months Hepatitis B vaccine control arm 30 Placebo
ELIGIBILITY CRITERIA
List inclusion criteria List exclusion criteria Age Category Minimum age Maximum age Gender
In order to be eligible to participate in this study, a subject must meet all of the following criteria: 1. Subject must sign/thumbprint written informed consent to participate in the trial. 2. Subject is a male or non-pregnant and non-lactating female age ≥ 20 and ≤ 45 years and in good health. 3. Subject is able to understand planned study procedures and demonstrate comprehension of the protocol procedures 4. In the opinion of the investigator, the subject can and will comply with the requirements of the protocol. 5. Subjects are available to attend all study visits and are reachable by phone throughout the entire study period from day -28 until day 180 (end of study). 6. The subject will remain within reasonable travelling distance from the study site from day 0 until day 7 after each administration. 7. The subject agrees to refrain from blood donation throughout the study period. 8. Female subjects of non-childbearing potential may be enrolled in the study. Non-childbearing potential is defined as current bilateral tubal ligation or occlusion, hysterectomy, bilateral ovariectomy or post-menopause. All subjects of childbearing potential must agree to use continuous adequate contraception* until 2 months after completion of the study. Female subjects must agree not to breastfeed from 30 days prior to administration until 2 months after completion of the study. Female subject must have a negative pregnancy test at the inclusion visit. A potential subject who meets any of the following criteria will be excluded from participation in this study: 1. Acute or chronic disease at time of administration, clinically significant pulmonary, cardiovascular, hepatic, renal, neurological or immunological functional abnormality, as determined by medical history, physical examination or laboratory screening tests 2. History of malignancy of any organ system (other than localized basal cell carcinoma of the skin), treated or untreated, within the past 5 years. 3. History of auto immune disease 4. Subjects with splenectomy 5. Chronic use of i) immunosuppressive drugs, ii) or other immune modifying drugs within three months prior to study onset (inhaled and topical corticosteroids and oral anti-histamines exempted) or expected use of such during the study period. 6. History of drug or alcohol abuse interfering with normal social function in the period of one year prior to study onset. 7. Known history of Human Immunodeficiency Virus (HIV) (No test will be done by the study) 8. Screening tests positive for Hepatitis B Virus (HBV), Hepatitis C Virus (HCV). 9. Use of any other investigational or non-registered product (drug or vaccine) during the study period. 10. Participation in any other clinical study involving an investigational product in the 30 days prior to the start of the study or during the study period. 11. Receipt of any other vaccination within 30 days prior to the first vaccination. 12. Any previous participation in any malaria (vaccine) study. 13. History of anaphylaxis or known severe hypersensitivity to any of the vaccine components (adjuvant or antigen or excipient) 14. Any other condition or situation that would, in the opinion of the investigator, place the subject at an unacceptable risk of injury or render the subject unable to meet the requirements of the protocol. Adult: 19 Year-44 Year,Middle Aged: 45 Year(s)-64 Year(s) 20 Year(s) 45 Year(s) Both
ETHICS APPROVAL
Has the study received appropriate ethics committee approval Date the study will be submitted for approval Date of approval Name of the ethics committee
Yes 17/07/2020 Comite Ethique de Recherche en Sante
Ethics Committee Address
Street address City Postal code Country
BP 06 Ouagadougou 01 Ouagadougou 06 Burkina Faso
OUTCOMES
Type of outcome Outcome Timepoint(s) at which outcome measured
Primary Outcome Incidence of serious adverse events and solicited grade 3 local and systemic adverse events (AEs) possibly, probably or definitely related to the vaccine in the period from first vaccination up to 1 month after the last immunization Up to one month
Secondary Outcome 1) The TRA at other timepoints (2 weeks after the first, second and second immunizations) and 4 months post third vaccination compared to baseline (D0) in each of the three dose-adjuvant groups. 2) The anti-6C antibody quantity in volunteer sera collected two weeks after each dose and 4 months post dose 3 compared to baseline in each of the three dose-adjuvant combinations, as determined by ELISA up to four months
RECRUITMENT CENTRES
Name of recruitment centre Street address City Postal code Country
District Sanitaire de Sabou Centre Medical Saint Maximilien Kolbe BP 10248 Ouagadougou 06 Ouagadougou 10248 Burkina Faso
FUNDING SOURCES
Name of source Street address City Postal code Country
PfTBV EDCTP RIA2018SV2311 2509 AA The Hague Hague 93015 Netherlands
SPONSORS
Sponsor level Name Street address City Postal code Country Nature of sponsor
Secondary Sponsor University of Sciences Techniques and Technologies of Bamako Hamdalaye ACI 2000 Rue 405 Porte 359 Bamako E423 Mali University
COLLABORATORS
Name Street address City Postal code Country
Groupe de Recherche Action en Sante Ouagadougou 06 Ouagadougou 10248 Burkina Faso
GRAS Ouagadougou 06 Ouagadougou 10248 Burkina Faso
CONTACT PEOPLE
Role Name Email Phone Street address
Principal Investigator Alfred TIONO a.tiono@gras.bf +22625355690 Ouagadougou 06
City Postal code Country Position/Affiliation
Ouagadougou 10248 Burkina Faso Principal Investigator
Role Name Email Phone Street address
Public Enquiries Issaka Sagara isagara@icermali.org +22376459079 MRTC Point G
City Postal code Country Position/Affiliation
Bamako 1805 Mali PfTBV EDCTP Consortium Coordinator and Sponsor representative
Role Name Email Phone Street address
Scientific Enquiries Michael Theisen mth@ssi.dk +4532688552 Artillerivej 5 2300 Copenhagen S
City Postal code Country Position/Affiliation
Copenhagen 2300 Denmark Senior Investigator
Role Name Email Phone Street address
Scientific Enquiries Jordan Plieskatt jplieskatt@gmail.com +4532683268 5 Artillerivej DK-2300 Copenhagen S
City Postal code Country Position/Affiliation
Copenhagen 2300 Denmark Senior Scientists
REPORTING
Share IPD Description Additional Document Types Sharing Time Frame Key Access Criteria
Yes We agree with IPD sharing. Results (text, figures, tables) of the and IPD will be provided. A link will also will be provided to have access to those data. Analytic Code,Clinical Study Report,Informed Consent Form,Statistical Analysis Plan,Study Protocol We agree with IPD sharing when data will be available within the indicated period. The IPD data will be available in 2 years (by November 2024) which is about one year after the completion of the study. The study sponsor which is USTTB (Univ. of Bamako) will share. This will be open data.
URL Results Available Results Summary Result Posting Date First Journal Publication Date
pftbv.org No
Result Upload 1: Result Upload 2: Result Upload 3: Result Upload 4: Result Upload 5:
Result URL Hyperlinks Link To Protocol
Result URL Hyperlinks
Changes to trial information