Safety, Immunogenicity, and Protective Efficacy of Radiation Attenuated Plasmodium Falciparum NF54 Sporozoites (PfSPZ Vaccine) During Malaria Transmission Season in Healthy African Adult Women of Childbearing Potential in Mali

Malaria Clinical Trial

Official title: Randomized, Placebo-Controlled, Double-Blind Study to Assess Safety, Immunogenicity, and Protective Efficacy of Radiation Attenuated Plasmodium Falciparum NF54 Sporozoites (PfSPZ Vaccine) During Malaria Transmission Season in Healthy African Adult Women of Childbearing Potential in Mali

Status Completed

Clinical Trial Summary

Background:

Malaria is a disease spread by mosquitos. Pregnant women are highly susceptible to malaria. This can lead to poor health outcomes for pregnant women and their babies. Researchers want to test a malaria vaccine in women of child bearing potential (WOCBP) and pregnant women. This has not been done before.

Objective:

To assess the safety and tolerability of PfSPZ vaccine in healthy Malian WOCBP.

Eligibility:

Healthy women ages 18 38 who live in Ouelessebougou, Mali, and surrounding villages

Design:

Participants will be screened with:

• Physical exam

• Medical history

• Blood, urine, and heart tests

• Multiple-choice test about malaria

Participants will get 3 injections by needle into a vein of the study vaccine or a placebo. All 3 will be within 1 month. They will not know whether they receive the vaccine or placebo.

Participants will receive treatment to prevent malaria. This will be about 2 weeks before the first and third injections.

After the third injection, participants will be followed for about 1 year. They will be tested to see if the vaccine is safe and protects against malaria infection. They will have blood tests.

If participants get a rash or injection site reaction, photos of the site may be taken.

Any women who become pregnant during the trial will be followed through the end of pregnancy. Babies and their mothers will be followed through the first year of life

Clinical Trial Description

Pregnant women are highly susceptible to Plasmodium falciparum malaria, leading to substantial maternal, perinatal, and infant mortality. While malaria vaccine development has made significant progress in recent years, no trials of malaria vaccines have ever been conducted in only women of child bearing potential (WOCBP) or in pregnant women.

PfSPZ Vaccine (Sanaria, Inc) is an advanced malaria candidate being developed for use in

pregnant women, owing in part to its highly favorable safety profile. The vaccine is comprised of aseptic, metabolically active, non-replicating, purified, cryopreserved P. falciparum sporozoites. In multiple double-blind, placebo-controlled trials, there have been no differences in adverse events between vaccinees versus controls. PfSPZ Vaccine induces immune responses to the sporozoite and liver stages of parasite development in the human host and prevents progression to blood stage parasitemia as well as averting disease sequelae; a compelling rationale to test PfSPZ Vaccine for its benefits in this proposed population.

Sanaria has already achieved vaccine efficacy against homologous and heterogenous parasite populations in endemic areas following three doses of PfSPZ Vaccine in several studies with 9.0x10^5 and 1.8x10^6 PfSPZ Vaccine and has explored accelerated regimens, such as 1, 8, 29 days. Accelerated PfSPZ Vaccine regimens such as this could induce protection earlier in pregnancy, minimizing the period at risk and improving pregnancy outcomes over the control group.

Given this, the Malaria Research and Training Center, the Laboratory of Malaria Immunology

and Vaccinology National Institute of Allergy and Infectious Diseases, and Sanaria, Inc. propose to initiate testing of the day 1, 8, and 29 dosing regimen of PfSPZ Vaccine in WOCBP, and in subsequent studies, in pregnant women, using doses of 9.0x10^5 and 1.8x10^6 PfSPZ Vaccine. This will be the first step in a clinical development plan for PfSPZ Vaccine in WOCBP and pregnant women: 1) safety and efficacy studies in non-pregnant WOCBP (this trial), 2) studies of the safety and efficacy of a primary immunization series in all trimesters, and 3) studies to evaluate the safety and efficacy of boosting during pregnancy.

A pregnancy registry study (#17-I-N018) has been ongoing in Mali since 2017 to gain

background data on maternal/fetal outcomes in the target population in anticipation of this study. Women who become pregnant during the course of this study, and their offspring, will be followed for maternal clinical outcomes and malaria infection. ;

Related Conditions & MeSH terms

• Malaria

• NCT number: NCT03989102
• Study type: Interventional
• Source: National Institutes of Health Clinical Center (CC)
• Status: Completed
• Phase: Phase 2
• Start date: July 3, 2019
• Completion date: March 17, 2023