GeoVax’s Next-Generation COVID-19 Vaccine Shows High Immunogenicity in Immunocompromised Patients

Atlanta, GA, May 24, 2023 – GeoVax Labs, Inc. (Nasdaq: GOVX), a biotechnology company developing immunotherapies and vaccines against cancers and infectious diseases, announced today the presentation of updates on the development of its next-generation SARS-CoV-2 vaccine, GEO-CM04S1, including preliminary data from an ongoing Phase 2 clinical trial, during the Vaccines Summit Boston 2023 and the Congress for the International Society for the Advancement of Cytometry (CYTO) 2023 meetings.

GeoVax logo

Each of the presentations included unpublished data from the open-label portion of the Phase 2 trial of CM04S1 (ClinicalTrials.gov Identifier: NCT04977024 ) in patients undergoing hematological cancer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 ). The preliminary analysis indicated CM04S1 is highly immunogenic in these patients, inducing both antibody responses, including neutralizing antibodies as well as T cell responses. These data support the planned progression of the Phase 2 clinical study, which includes a direct comparison to currently approved mRNA vaccines.

Kelly McKee, M.D., GeoVax’s Chief Medical Officer, commented, “These data extend to severely immunocompromised patients our earlier findings in healthy adults that GEO-CM04S1 stimulated a robust, durable, and broad-based humoral and cellular immune response against multiple SARS-CoV-2 variants. Validation of these findings in additional patients with hematologic malignancies, who have received CAR-T and stem cell transplants, is underway as we seek to provide a vaccine solution to those individuals unable to mount adequate protective responses with currently available COVID-19 vaccines.”

CM04S1 continues to advance in a second 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.

About GEO-CM04S1

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. 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 provide protection 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.

CM04S1 continues to advance in two Phase 2 clinical studies, one as a primary vaccine for immunocompromised cancer patients, in direct comparison to either the Pfizer or Moderna mRNA vaccine (ClinicalTrials.gov Identifier: NCT04977024 ), and the second as a booster for healthy patients who have previously received either the Pfizer or Moderna vaccine as their initial inoculation (ClinicalTrials.gov Identifier: NCT04639466 ).  

About GeoVax

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 two Phase 2 clinical trials, GEO-CM04S1 is being evaluated as a COVID-19 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. 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.

By Maria Thacker Goethe May 8, 2025
Disclaimer: This statement was published on May 9, 2025, at 12:11 PM and is subject to change as the administration moves forward with policy decisions. -- In a rapidly developing situation, the White House is poised to take executive action on prescription drug pricing that could significantly impact the biopharmaceutical industry. Early next week, the president is expected to sign an executive order directing administration officials to pursue a "Most Favored Nation" initiative, which would tie U.S. government drug payments to lower prices paid abroad, according to sources familiar with the matter who were granted anonymity to discuss internal deliberations. This executive order would bypass the legislative discussions previously reported in Congress, where Republicans on the House Energy and Commerce Committee had been considering similar measures as potential spending cuts. While the plan hasn't been finalized and could still change as officials work through specifics, the move signals the administration's intent to act quickly on drug pricing. If enacted, the MFN policy could be paired with other proposed changes, such as increasing the 23.1% Medicaid base rebate. Reports suggest that manufacturers might be required to pay either the MFN price or the higher rebate—whichever yields the lowest cost for the government. This policy would create severe financial pressure on drug developers, particularly small and mid-size companies that are essential to Georgia’s thriving life sciences ecosystem. Georgia is home to a growing network of biotech, pharmaceutical, and medical technology firms—many of which are advancing groundbreaking treatments for rare diseases, pediatric conditions, and underserved populations. These companies often operate with little commercial revenue and rely on a balanced, predictable pricing framework to continue investing in innovation. In 2023, pharmaceutical companies provided $54 billion in Medicaid rebates nationally, helping keep drug spending to just 5.9% of total Medicaid expenditures . The current system works by ensuring broad patient access to medicine while enabling companies to reinvest in research and development. Drastic changes such as MFN pricing would upend this balance and threaten job creation and investment in states like Georgia. Moreover, because Medicaid rebate amounts are tied to 340B discount calculations, the impact would extend far beyond Medicaid—further increasing costs in the already-burdened 340B program. In response, Georgia Life Sciences has joined a coalition of more than 40 state bioscience associations, signing onto a letter from the Council of State Bioscience Associations (CSBA) opposing any MFN or foreign reference pricing schemes. The letter highlights the harm such policies would inflict on rare disease patients, pediatric populations, and emerging biotechnology companies. “Rather than penalizing innovative companies that develop treatments for vulnerable patients, we should work together to ensure the U.S. maintains its strategic leadership in biopharmaceutical innovation and that American patients have access to the best treatments available.” — CSBA Letter, May 2025 Georgia Life Sciences is actively monitoring the situation and preparing to advocate on behalf of Georgia’s life sciences community.
By Sheran Brown May 1, 2025
Opinion: Georgia's Congressional delegation can lead the way on correcting 'pill penalty'  Maria Thacker Goethe President and CEO, Georgia Life Sciences: May 1, 2025 EPIC Act offers commonsense fix to 'pill penalty' problem
By Maria Thacker Goethe April 18, 2025
The Science & Community Impacts Mapping Project (SCIMaP) shows how proposed federal funding cuts lead to reduced economic activity and job losses nationwide.
MORE POSTS