A Study to Assess the Safety and Immune Response to Env-C DNA and Protein Vaccines in Kenya

HIV Infections Clinical Trial

Official title: A Randomized, Double-Blind Phase 1 Trial to Evaluate the Safety and Immunogenicity of Priming With Env-C Plasmid DNA Vaccine Alone, With Different Adjuvants, or With an Adjuvanted HIV Env gp145 C.6980 Protein Vaccine and Boosting With the Adjuvanted HIV Env gp145 C.6980 Protein Vaccine With or Without the Env-C Plasmid DNA Vaccine in Healthy HIV Uninfected Adults in Kenya

Status Completed

Clinical Trial Summary

This is a study of HIV vaccines. A vaccine is a medical product given to prevent certain diseases. The vaccine may educate the body to form a defensive response to try to prevent the disease from the beginning, or preventing it from taking hold of the body. This defensive response is called the immune response. The experimental vaccines in this study are Env-C Plasmid DNA and HIV Env gp145 C690 protein, given with different adjuvants. An adjuvant is a substance added to vaccines that can help make the vaccine more effective by improving the immune response, or by causing the immune response to last longer than it would without the adjuvant. The adjuvants are mixed with the vaccines and injected into muscle or placed on top of the skin. The HIV vaccines contain a piece of genetic material or a protein copied drom the HIV virus cover (Env), but they do not contain the virus itself. The vaccines cannot cause HIV infection or Acquired Immune Deficiency Syndrome (AIDS).

The purpose of this study is to find out if the study vaccines with adjuvants cause side effects and are tolerable, whether humans respond (develop immune responses) to the vaccines, and how ling the effects of the study vaccines last. The study will also compare the effects of the study vaccines with adjuvants and adjuvant patch to those of placebo injections and placebo patch. The placebo will consist of saline (sterile saltwater) and will look like study vaccines, be given in the same way, but will have no active vaccine or adjuvant in it. A total of 126 participants will take part in the study and each will have up to 26 clinic visits and will be followed-up for a total of 108 weeks.

Clinical Trial Description

Antibodies are the most commonly recognized correlate of vaccine protection from infection; however the possible protective HIV antibody levels, which were induced by the modestly protective RV144 vaccine regimen with alum, rapidly decayed. Potentially, a novel, highly selective adjuvant combined with the correctly sequenced HIV antigen could slow antibody decay, increase antibody magnitude and induce antibodies of appropriate functional response.

RV460 is an exploratory study that will assess the safety, tolerability, and immunogenicity of a vaccine regimen consisting of priming with an Env-C Plasmid DNA vaccine (with or without novel adjuvants) when given with or without adjuvanted HIV Env gp145 C.6980 protein vaccine and boosting with adjuvanted gp145 C.6980 protein with or without the gp120 DNA vaccine. The study will be carried out in Kericho, Kenya. 126 healthy adults will ben enrolled. Participants will be randomized into one of seven groups which have 15/3 vaccine/placebo recipients per group. Each participant will receive six injections (prim at week 0, 4, 12; boost at week 20, 32 and 56) and will be followed-up for a total of 108 weeks. ;

Related Conditions & MeSH terms

• HIV Infections

• NCT number: NCT04826094
• Study type: Interventional
• Source: National Institute of Allergy and Infectious Diseases (NIAID)
• Status: Completed
• Phase: Phase 1
• Start date: March 15, 2021
• Completion date: February 13, 2024