GeoVax Announces First Patients Vaccinated in Phase 2 Clinical Trial of COVID-19 Vaccine Booster in Patients with Chronic Lymphocytic Leukemia

Seeking Improved Immune Response vs mRNA Vaccine Full Patient Enrollment Expected Within Six Months

ATLANTA, GA, August 10, 2023 — GeoVax Labs, Inc. (Nasdaq: GOVX), a biotechnology company developing immunotherapies and vaccines against cancers and infectious diseases, today announced that vaccinations have begun in an investigator-initiated clinical trial (ClinicalTrials.gov Identifier: NCT05672355) of GEO-CM04S1 in patients with chronic lymphocytic leukemia (CLL), being conducted at City of Hope National Medical Center.

Despite a high vaccination rate, CLL patients may be at high risk for lethal COVID-19 infection due to poor immune response to currently available vaccines. The GEO-CM04S1 vaccine uses a modified vaccinia virus (MVA) backbone to carry SARS-CoV-2 virus antigens that may be more effective at inducing COVID-19 immunity in patients with poor humoral immune responses since MVA strongly induces T cell expansion even in the background of immunosuppression. By targeting both the spike (S) and nucleocapsid (N) protein antigens, GEO-CM04S1 broadens the specificity of the immune responses and protects against the loss of efficacy associated with current vaccines due to the significant sequence variation observed with the spike antigen.

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The study is examining the use of two injections of GEO-CM04S1, three months apart, to assess immune responses in these vulnerable patients, with an mRNA vaccine (currently, the Pfizer-BioNTech Bivalent vaccine) as the control arm. Participants will be randomized 1:1 to receive two boosters with either the GEO-CM04S1 or the control vaccine. The primary immune response outcome will be assessed at 56 days following the first booster injection. Up to 40 participants in each arm will be vaccinated, with immune responses evaluated and compared at the interim and final analyses.

David Dodd, GeoVax President and CEO, stated, “We are very pleased with the rapid start for this third important study for GEO-CM04S1, which we expect will achieve full patient enrollment within six months. We believe the GEO-CM04S1 vaccine, containing the two antigens, S and N, along with the recognized antibody and cellular immune responses resulting from the MVA approach, has the potential to offer greater booster protection than that from the current vaccines in use, as well as provide a greater degree of protection within immunocompromised patients. We expect the CLL trial will add to the data coming from our other ongoing trials, confirming the potential benefit of GEO-CM04S1 in another population of immunocompromised individuals. We look forward to sharing progress reports as we advance.”

About GEO-CM04S1

GEO-CM04S1 is a next-generation COVID-19 vaccine based on GeoVax’s MVA viral vector platform, which supports the presentation of multiple vaccine antigens to the immune system in a single dose. GEO-CM04S1 presents both the spike and nucleocapsid antigens of SARS-CoV-2 and is specifically designed to induce both antibody and T cell responses to non-variable parts of the virus. The more broadly specific and functional engagement of the immune system is designed to protect against the new and continually emerging variants of COVID-19. Based on data from animal models and a completed Phase 1 clinical study, vaccine-induced immune responses were shown to recognize both early and later variants of SARS-CoV-2, including the Omicron variant. Vaccines of this format should not require repeated modification and updating.

A recent presentation of unpublished data from the open-label portion of the Phase 2 trial of GEO-CM04S1 ( ClinicalTrials.gov Identifier: NCT04977024) in patients undergoing hematological cancer treatment (i.e., patients who have reduced immune system function as a result of treatment) indicates that GEO-CM04S1 is highly immunogenic in these patients, inducing both antibody responses, including neutralizing antibodies, and T cell responses. These data support the planned progression of the Phase 2 clinical study, which will include a direct comparison to currently approved mRNA vaccines. GEO-CM04S1 also continues to advance in another Phase 2 clinical trial as a booster for healthy patients who have previously received the Pfizer or Moderna mRNA vaccine (ClinicalTrials.gov Identifier: NCT04639466). Data from these studies will form the basis for comparing vaccine potential in unique patient groups as well as the general population.

GeoVax Labs, Inc. is a clinical-stage biotechnology company developing novel therapies and vaccines for solid tumor cancers and many of the world’s most threatening infectious diseases. The company’s lead program in oncology is a novel oncolytic solid tumor gene-directed therapy, Gedeptin ® , presently in a multicenter Phase 1/2 clinical trial for advanced head and neck cancers. GeoVax’s lead infectious disease candidate is GEO-CM04S1, a next-generation COVID-19 vaccine targeting high-risk immunocompromised patient populations. Currently in three Phase 2 clinical trials, GEO-CM04S1 is being evaluated as a primary vaccine for immunocompromised patients such as those suffering from hematologic cancers and other patient populations for whom the current authorized COVID-19 vaccines are insufficient, and as a booster vaccine in patients with chronic lymphocytic leukemia (CLL). In addition, GEO-CM04S1 is in a Phase 2 clinical trial evaluating the vaccine as a more robust, durable COVID-19 booster among healthy patients who previously received the mRNA vaccines. GeoVax has a leadership team who have driven significant value creation across multiple life science companies over the past several decades. For more information, visit our website: www.geovax.com.

Georgia Life Sciences Weighs In on PBM and 340B Policy

October 5, 2026
Georgia Life Sciences has submitted written comments to the Georgia House Study Committee on Pharmacy Benefits Managers and Consumers’ Access to Prescription Medications, encouraging greater transparency, accountability, and a focus on measurable patient benefit across the prescription drug system. The comments address both pharmacy benefit manager practices and the federal 340B Drug Pricing Program, emphasizing the importance of understanding where prescription drug savings accrue and whether those savings ultimately benefit patients. The Study Committee continues its work this fall as it develops recommendations for the Georgia General Assembly. Read Georgia Life Sciences’ full comments →

Georgia Life Sciences Joins National Coalition Calling for PAHPA Reauthorization

September 22, 2026
Georgia Life Sciences (GLS) has joined more than 80 organizations from across industry, academia, public health and the biosecurity community in calling on congressional leaders to fully reauthorize the Pandemic and All-Hazards Preparedness Act (PAHPA) before the end of 2026. Led by the Johns Hopkins Center for Health Security, the coalition urged congressional leaders to advance a comprehensive reauthorization of PAHPA, the federal framework that supports the nation’s ability to prepare for and respond to public health emergencies and other health security threats. First enacted in 2006, PAHPA established and strengthened critical components of the nation’s health security infrastructure, including the Biomedical Advanced Research and Development Authority (BARDA). The law also supports public-private partnerships involved in the research, development, manufacturing and procurement of medical countermeasures, including vaccines, therapeutics and diagnostics. PAHPA’s authorization expired in 2023 and key provisions have since continued through short-term extensions. The coalition is calling for a comprehensive reauthorization that provides greater stability and ensures the nation’s preparedness infrastructure can continue adapting to emerging biological, infectious disease and other health security threats. For the life sciences industry, these programs are particularly important. Partnerships between government and industry can help move promising technologies from research through development and manufacturing while maintaining capabilities needed to respond quickly during an emergency. The Biotechnology Innovation Organization (BIO), also a signatory to the letter, has identified several priorities for reauthorization, including continued authorization of BARDA, the Strategic National Stockpile, Project BioShield and the Pandemic Influenza Program, as well as incentives supporting the development of medical countermeasures. Georgia Life Sciences is proud to join organizations across the country in supporting a strong and sustainable national framework for health security, preparedness and biomedical innovation. Read the coalition letter and view the full list of signatories.

Georgia Life Sciences Urges Protection of Patient Access as Georgia Implements Medicaid Changes

September 14, 2026
Georgia Life Sciences has submitted comments to the Georgia Department of Community Health (DCH) regarding the Georgia Pathways to Coverage program and implementation of new federal Medicaid requirements. As Georgia prepares for these changes, Georgia Life Sciences is urging state leaders to prioritize continuity of care and minimize unnecessary administrative barriers that could delay or disrupt access to medically necessary treatment . This is particularly important for Georgians living with serious, chronic, rare, and medically complex conditions who may rely on ongoing medications, diagnostics, therapies, medical technologies, specialty care, and coordinated treatment plans. Even temporary disruptions in coverage can interrupt care and create additional challenges for patients and families. In its comments, Georgia Life Sciences encouraged DCH to protect continuity of coverage during eligibility and redetermination processes, provide patients and caregivers with clear and timely information, minimize unnecessary administrative burdens, and establish appropriate safeguards when a coverage disruption could interrupt an established course of treatment. “As Georgia implements these new federal requirements, we want to ensure that patients remain at the center of the process,” said Maria Thacker Goethe, MPH, President & CEO of Georgia Life Sciences. “Administrative changes should not become barriers between patients and the care they need. Protecting continuity of care is particularly important for Georgians managing serious and complex health conditions.” Read Georgia Life Sciences’ full comments to DCH here.
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