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Efficacy, Safety and Immunogenicity Study of GlaxoSmithKline(GSK) Biologicals' Candidate Malaria Vaccine 257049 in the Sporozoite Challenge Model in Healthy Malaria-naïve Adults

NCT01857869 · Status: COMPLETED · Phase: PHASE2 · Type: INTERVENTIONAL · Enrollment: 64

Last updated 2019-06-26

Study results available
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Summary

This study is designed to evaluate safety, reactogenicity, immunogenicity, and efficacy of GSK Biological's malaria candidate vaccine 257049 administered as standard doses at 0 and 1 months and 1/5th standard dose at 7 months (delayed fractional dose group) and 257049 administered as three standard doses one month apart (0, 1, 2-month group) in healthy malaria-naïve volunteers aged 18-50 years in the sporozoite challenge model.

An additional, delayed sporozoite challenge will assess persistence of protection induced by the primary immune schedule and if an additional dose can provide protection in those unprotected by the initial vaccination series.

Conditions

Interventions

BIOLOGICAL

GSK257049 Dosage 1

RTS,S/AS01B administered as 0.5 mL dose at 0 and 1 months and 0.1 mL dose at 7 months for 0,1,7 M Group (delayed fractional dose group). In subjects unprotected in the first challenge, to receive a booster with a fractional dose of RTS,S/AS01B followed by rechallenge. In subjects protected in the first challenge, randomization to receive or not receive a booster with a fractional dose of RTS,S/AS01B followed by rechallenge.

BIOLOGICAL

GSK257049 Dosage 2

RTS,S/AS01B administered as three doses of 0.5mL given one month apart (0, 1, 2 M group) in the challenge model. In subjects unprotected in the first challenge, to receive a booster with a fractional dose of RTS,S/AS01B followed by rechallenge. In subjects protected in the first challenge, randomization to receive or not receive a booster with a fractional dose of RTS,S/AS01B followed by rechallenge.

PROCEDURE

Sporozoite-infected mosquitoes challenge

Mosquitoes infected approximately 2-3 weeks earlier that are likely to contain sporozoites in their salivary glands will be allowed to feed on the volunteers. For each volunteer, five mosquitoes will be allowed to feed over five minutes, after which they will be dissected to confirm how many were infected, and the salivary glands scored. The challenge is scheduled to occur approximately 21 days (3 weeks) after the last vaccination visit (Study Day 196). Volunteers who reconsent for the boost/rechallenge phase will be rechallenged with sporozoite-infected mosquitoes, scheduled to occur approximately 21 days (3 weeks) after the booster dose (Booster Phase Study Day 21).

Sponsors & Collaborators

  • Walter Reed Army Institute of Research (WRAIR)

    collaborator FED

  • The PATH Malaria Vaccine Initiative (MVI)

    collaborator OTHER

  • GlaxoSmithKline

    lead INDUSTRY

Principal Investigators

  • GSK Clinical Trials · GlaxoSmithKline

Study Design

Allocation
NON_RANDOMIZED
Purpose
PREVENTION
Masking
NONE
Model
PARALLEL

Eligibility

Min Age
18 Years
Max Age
50 Years
Sex
ALL
Healthy Volunteers
Yes

Timeline & Regulatory

Start
2013-05-20
Primary Completion
2014-03-24
Completion
2014-12-16

Countries

  • United States

Study Locations

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Read the full study record

This page highlights key information. For complete eligibility criteria, study locations, investigator contacts, and the full protocol, visit the original record on ClinicalTrials.gov.

View NCT01857869 on ClinicalTrials.gov