A Phase 1 interventional study of Vaccine AnAPN1 in Malaria, sponsored by Centre de Recherche Médicale de Lambaréné. Completed at 1 site in Gabon. Open to participants aged 18 Years to 45 Years, including healthy volunteers. Per ClinicalTrials.gov, last updated 2025-05-02.
Sponsored by Centre de Recherche Médicale de Lambaréné · Phase 1, Interventional, and Prevention
Malaria is still responsible for more than 627,000 deaths each year, predominantly among children under 5 years old. Current reductions in deaths have stagnated, and additional setbacks for malaria control programs due to the Coronavirus Disease 2019 (COVID-19) pandemic are expected. To achieve malaria elimination and eradication a leverage concerted approaches to reduce clinical disease and prevent new infections is a must. The existing malaria controls tools including the a recombinant protein-based malaria vaccine (RTS,S ,(trade name MosquirixMosquirix )), a malaria vaccine currently undergoing implementation studies and endorsed by the World Health Organization on October 7, 2021, can reduce disease burden for patients but cannot ultimately support malaria elimination and eradication since their effect on malaria transmission is at most partial. Consequently, complementary interventions, such as transmission-blocking vaccines (TBVs) may prove to be a cost-effective intervention that can reduce on-going residual transmission and the cascade of new infections.
TBVs work by blocking parasite transmission to and from mosquitoes, with the added benefit of preventing the spread of parasites that have developed drug resistance or those that are vaccine-escape mutants of e.g. RTS,S. However, blocking transmission of all malaria species will be mandatory to achieve a globally relevant impact on malaria morbidity and mortality with Plasmodium falciparum and Plasmodium vivax being the most relevant targets. To date, the mosquito recombinant protein antigen vaccine Anopheline Alanyl Aminopeptidase N (AnAPN1)is the only TBV candidate that meets this need, wherein antibodies to this vaccine block both human malaria parasite species, underscoring its potential for supporting malaria elimination. The AnAPN1 vaccine consists of the AnAPN1 dimer antigen construct (UF6b) construct derived from the sequence of a protein of the mosquito midgut (Anopheles gambiae alanyl aminopeptidase), expressed as a recombinant protein in bacteria. With Global Health Innovative Technology Fund( GHIT) (G2020-208) support, the AnAPN1 reaches the First-In-Human milestone.
1,184 studies on the registry are indexed under Malaria; 79 are open to participants now.
This study's enrollment of 33 is below the median of 252 across 937 interventional studies indexed under Malaria.
Browse Malaria studies →Centre de Recherche Médicale de Lambaréné is the lead sponsor of 17 studies on the registry; 3 are open to participants now.
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Exclusion Criteria:
Underlined terms in the criteria open these too. Explained by clinicaltrials.gg, not part of the registry record. The study team decides who can take part.
Before you join, the study team explains what taking part involves — its purpose, what happens, the risks and possible benefits — and answers your questions, so you can decide freely. Consent is usually recorded on a form (the informed consent form, ICF) signed by you or, where the law allows, by someone legally authorised to decide for you.
You can keep asking questions during the study, you are told of new information that matters, and you can choose to leave at any time.
Ways of preventing pregnancy. “Highly effective” methods fail less than 1% of the time a year when used correctly — for example an IUD or an implant.
Criteria usually say which methods count and how long to keep using them after the last dose, sometimes for male participants too. Some studies accept a partner’s vasectomy if it was confirmed successful and that person is the participant’s only sexual partner.
The human immunodeficiency virus, which weakens the immune system.
Many studies now accept people whose HIV is controlled on treatment, judged by the viral load and the CD4 count. Check the limits this study sets.
Informed consent
Before you join, the study team explains what taking part involves — its purpose, what happens, the risks and possible benefits — and answers your questions, so you can decide freely. Consent is usually recorded on a form (the informed consent form, ICF) signed by you or, where the law allows, by someone legally authorised to decide for you.
You can keep asking questions during the study, you are told of new information that matters, and you can choose to leave at any time.
Explained by clinicaltrials.gg, not part of the registry record. The study team decides who can take part.
Contraception
Ways of preventing pregnancy. “Highly effective” methods fail less than 1% of the time a year when used correctly — for example an IUD or an implant.
Criteria usually say which methods count and how long to keep using them after the last dose, sometimes for male participants too. Some studies accept a partner’s vasectomy if it was confirmed successful and that person is the participant’s only sexual partner.
Explained by clinicaltrials.gg, not part of the registry record. The study team decides who can take part.
HIV
The human immunodeficiency virus, which weakens the immune system.
Many studies now accept people whose HIV is controlled on treatment, judged by the viral load and the CD4 count. Check the limits this study sets.
Explained by clinicaltrials.gg, not part of the registry record. The study team decides who can take part.
n=2 will receive a dose of 20 mcg UF6b (A1), n=9 will receive 20 mcg AnAPN1: GLA-LSQ (5 mcg GLA/2 mcg LSQ) (A2)
Drug: Vaccine AnAPN1
n=2 will receive 50 mcg UF6b (B1), n=9 will receive 50 mcg UF6b: GLA- LSQ (12.5 mcg GLA/5 mcg LSQ) (B2)
Drug: Vaccine AnAPN1
n=2 will receive 100 mcg UF6b (C1); n=9 will receive 100 mcg UF6b: GLA- LSQ (25 mcg GLA/10 mcg LSQ) (C2)
Drug: Vaccine AnAPN1
AnAPN1 is a recombinant protein expressed in Escherichia coli. It consists of the UF6b construct, derived from the sequence of the Anopheles gambiae alanyl aminopeptidase N (XM_318000.4) and will be formulated with or without Synthetic Glucopyranosyl Lipid A (GLA)- LSQ adjuvant. Route of administration is intramuscular.
Adverse events related to the vaccination.
Number and grade of adverse events possibly, likely, and definitely related to vaccination.
Time frame: Day 14
anti-UF6b IgG concentration
Area under the curve of anti-UF6b immunoglobulin G (IgG) concentration, using a qualified and validated ELISA protocol.
Time frame: Day 28
Plan to share: No
No publications or documents are linked to this record.
Ran from Sep 2023 to primary completion in Jan 2025, 16 months.
Of 64 non-industry phase 1 interventional studies under Malaria, half reached primary completion within 13 months of starting (the median), counting those still running; a quarter within 7 and three quarters within 24. This study's 16 months is above that.
Counting every sponsor, half of 93 studies reached it within 13 months; a quarter within 7 and three quarters within 20.
How these figures are worked out, and which studies are left out of them.
This study is completed, as verified in Apr 2025. You cannot join it, but the record below documents what was studied.
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Centre de Recherche Médicale de Lambaréné