INOVIO Announces Positive Data from Phase 2 Segment of Clinical Trial Evaluating INO-4800, its COVID-19 DNA Vaccine

INOVIO, a biotechnology company focused on bringing to market precisely designed DNA medicines to treat and protect people from infectious diseases, cancer, and HPV-associated diseases, announced positive safety, tolerability and immunogenicity data from its placebo-controlled and blinded Phase 2 segment of its Phase 2/3 clinical trial in the U.S., called INNOVATE (INOVIO INO-4800 Vaccine Trial for Efficacy), evaluating INO-4800, its DNA vaccine candidate for COVID-19. Preliminary results show in a larger population that INO-4800 was generally safe, well-tolerated and immunogenic in all studied age groups.

Findings from the Phase 2 Clinical Trial:

  • The Phase 2 segment of the trial enrolled approximately 400 participants, 18 years of age or older, at 16 U.S. sites.
    Participants received either INO-4800 (1.0 mg or 2.0 mg dose) or placebo at 0 and 4 weeks (randomized 3:3:1:1). Each dose was administered by intradermal injection followed by electroporation using INOVIO’s CELLECTRA®, its proprietary smart device.
  • Safety endpoints included systemic and local administration site reactions through 8 weeks post-dose one (or 4 weeks post-dose . Immunology endpoints included antigen-specific binding antibody titers, neutralization titers, and antigen-specific interferon-gamma (IFN-γ) cellular immune responses after two doses of the vaccine.
  • Vaccine administration was generally safe and well-tolerated. The majority of adverse events (AEs) were Grade 1 and Grade 2 in severity and did not appear to increase in frequency with the second dose. The number of participants experiencing each of the most common AEs did not differ between the two dosing groups.
  • The geometric mean fold rise (GMFR) of binding and neutralizing antibody levels were statistically significantly greater in the 2.0 mg dose group versus the 1.0 mg dose group.
  • The T cell immune responses measured by the ELISpot assay were also higher in the 2.0 mg dose group compared to the 1.0 mg dose group. identifier: NCT04642638

The Phase 2 segment of INNOVATE was designed to evaluate the safety, tolerability and immunogenicity of INO-4800 in a two-dose regimen (1.0 mg or 2.0 mg) in a three-to-one-randomization to receive either INO-4800 or placebo for each dose to identify optimal dose(s) for two age groups (18-50 years and 51 years and older) for the subsequent Phase 3 efficacy evaluation. The preliminary Phase 2 results showed that INO-4800 was safe, well-tolerated and immunogenic in all tested age groups. The trial was funded by the Department of Defense Joint Program Executive Office for Chemical, Biological, Radiological and Nuclear Defense, (JPEO-CBRND) in coordination with the Office of the Assistant Secretary of Defense for Health Affairs (OASD(HA)) and the Defense Health Agency. Results from the trial can be found in the paper entitled “Safety and immunogenicity of INO-4800 DNA vaccine against SARS-CoV-2: A Preliminary Report of a Randomized, Blinded, Placebo-controlled, Phase 2 Clinical Trial in Adults at High Risk of Viral Exposure,” has been published as a pre-print in MedRxiv ( prior to peer review.

Dr. Laurent M. Humeau, INOVIO’s Chief Scientific Officer, said, “We thank the volunteers who are participating in our INNOVATE Phase 2 blinded trial, as well as the research partners, clinical teams and INOVIO employees who have been working tirelessly to advance this important work. Our Phase 2 results validate our initial COVID-19 Phase 1 results in a larger population, which show that INO-4800 continues to be generally safe, well-tolerated and immunogenic in all studied age groups. The expanded data set enabled a clear dose selection to be made with 2.0 mg as the dose for the global Phase 3 efficacy trial.”

INOVIO plans to file preliminary Phase 2 results and device data with the U.S. Food and Drug Administration (FDA). Following the submission and FDA concurrence to proceed, the company plans to conduct a global Phase 3 clinical trial for INO-4800. The company recognizes the growing and unmet global demand for both initial as well as boosting doses of COVID-19 vaccines and looks forward to supporting the rollout of much needed additional vaccines to prevent the spread of COVID-19 – including both current and future variants – around the world.


INOVIO is a biotechnology company focused on rapidly bringing to market precisely designed DNA medicines to treat and protect people from infectious diseases, cancer, and diseases associated with HPV. INOVIO is the first and only company to have clinically demonstrated that a DNA medicine can be delivered directly into cells in the body via a proprietary smart device to produce a robust and tolerable immune response. Specifically, INOVIO’s lead candidate VGX-3100 met primary and secondary endpoints for all evaluable subjects in REVEAL 1, in the first of two Phase 3 trials for precancerous cervical dysplasia, demonstrating ability to destroy and clear both high-grade cervical lesions and the underlying high-risk HPV 16 and 18. INOVIO is also evaluating INO-4800, a DNA vaccine candidate against COVID-19, in a Phase 2 clinical trial in the U.S., as well as Phase 2 trials in China and South Korea. Partners and collaborators include Advaccine, ApolloBio Corporation, AstraZeneca, The Bill & Melinda Gates Foundation, Coalition for Epidemic Preparedness Innovations (CEPI), Defense Advanced Research Projects Agency (DARPA)/Joint Program Executive Office for Chemical, Biological, Radiological and Nuclear Defense (JPEO-CBRND)/Department of Defense (DOD), HIV Vaccines Trial Network, International Vaccine Institute (IVI), Kaneka Eurogentec, Medical CBRN Defense Consortium (MCDC), National Cancer Institute, National Institutes of Health, National Institute of Allergy and Infectious Diseases, Ology Bioservices, the Parker Institute for Cancer Immunotherapy, Plumbline Life Sciences, Regeneron, Richter-Helm BioLogics, Thermo Fisher Scientific, University of Pennsylvania, Walter Reed Army Institute of Research, and The Wistar Institute.

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