Clinical Trial: Study of Co-administered Na-APR-1 (M74) and Na-GST-1 in Gabonese Children

Study Status: Recruiting
Recruit Status: Recruiting
Study Type: Interventional

Official Title: Randomized, Controlled, Phase 1 Study to Assess Safety and Immunogenicity of Co-administered Hookworm Vaccine Candidates Na-APR-1 (M74)/Alhydrogel® and Na-GST-1/ Alhydrogel® in Gabonese Chil

Brief Summary: Double blind, randomized, controlled, dose-escalation Phase 1 clinical trial in hookworm-exposed children aged 6 to 10 years living in the area of Lambaréné, Gabon. Children will receive three doses of the Na-GST-1/Alhydrogel hookworm vaccine co-administered with the Na-APR-1 (M74)/Alhydrogel hookworm vaccine or the hepatitis B vaccine co-administered with sterile saline. All injections will be delivered intramuscularly (deltoid) on approximately Days 0, 56, and 112 or 180.

Detailed Summary:

Double blind, randomized, controlled, dose-escalation Phase 1 clinical trial in hookworm-exposed children aged 6 to 10 years living in the area of Lambaréné, Gabon. Children will receive three doses of the assigned vaccine(s) delivered intramuscularly (deltoid) on approximately Days 0, 56, and 112 or 180.

Safety will be measured from the time of each study vaccination (Day 0) through 14 days after each study vaccination by the occurrence of solicited injection site and systemic reactogenicity events.

Unsolicited non-serious adverse events (AEs) will be collected from the time of the first study vaccination through approximately 1 month after each study vaccination. New-onset chronic medical conditions and Serious Adverse Events (SAEs) will be collected from the time of the first study vaccination through approximately 9 months after the third study vaccination (final visit). Clinical laboratory evaluations for safety will be performed on venous blood collected approximately 14 days after each vaccination.

Immunogenicity testing will include IgG antibody responses to each vaccine antigen, by a qualified indirect enzyme-linked immunosorbent assay (ELISA), on serum or plasma obtained prior to each study vaccination and at time points after each vaccination (see Appendix A); the functional activity of vaccine-induced antibodies will be assessed by in vitro enzyme neutralization assays; the induction of B cell memory will be measured by antigen-specific memory B cell responses.

Recruitment and enrollment into the study will occur on an ongoing basis, with each group being recruited and vaccinated in sequence.

60 subjects will be enrolled into 3 groups of 20. The first 20
Sponsor: Baylor College of Medicine

Current Primary Outcome: Vaccine-related Adverse Events [ Time Frame: Day 380 ]

To evaluate the safety and reactogenicity of three different dose concentrations of Na-APR-1 (M74)/Alhydrogel® co-administered with Na-GST-1/Alhydrogel® in healthy Gabonese children.


Original Primary Outcome: Same as current

Current Secondary Outcome: IgG response to Na-GST-1 and Na-APR-1 (M74) [ Time Frame: 14 days after the third vaccination ]

To determine the doses of co-administered Na-APR-1 (M74) and Na-GST-1 that result in the highest levels of IgG antibody approximately 14 days after the third vaccination.


Original Secondary Outcome: Same as current

Information By: Baylor College of Medicine

Dates:
Date Received: July 18, 2016
Date Started: January 2017
Date Completion: October 2018
Last Updated: May 18, 2017
Last Verified: April 2017