On November 3, 2025 Evaxion A/S (NASDAQ: EVAX) ("Evaxion"), a clinical-stage TechBio company specializing in developing AI-Immunology powered vaccines, reported its R&D pipeline with the addition of EVX-04, an AI-designed precision cancer vaccine candidate. We will pursue clinical development of EVX-04, currently in preclinical development, as a new therapeutic vaccine against acute myeloid leukemia (AML).

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EVX-04 is designed to target non-conventional ERV (endogenous retrovirus) tumor antigens from the dark genome. These antigens are present in tumors but absent in normal tissue, making them highly attractive targets for cancer vaccines.

Leveraging our proprietary AI-Immunology platform, Evaxion has identified ERV antigens in patient tumor sequencing data. Uniquely, the platform then selects optimal fragments from these antigens based on their potential to be effective vaccine targets across a wide range of patients.

By including multiple of these fragments in EVX-04, the vaccine is designed to be effective in all patients regardless of immune and tumor ERV antigen differences. This makes EVX-04 a so-called "off-the-shelf" vaccine preproduced and ready for immediate administration after diagnosis.

"We are very excited to select a lead candidate for our ERV-based precision cancer vaccine concept. Representing a completely novel approach, EVX-04 is a great example of how AI-Immunology enables us to design and develop new therapies that could lead to better outcomes for patients. This approach could enable broader use of cancer vaccines, including for patients who do not respond to conventional immunotherapies," says Birgitte Rønø, CSO and interim CEO of Evaxion.

New data to be presented at ASH (Free ASH Whitepaper) Meeting
New preclinical data demonstrates that EVX-04 induces strong T-cell responses and kill cancer cells. The data will be presented at an oral session at the American Society of Hematology (ASH) (Free ASH Whitepaper) Annual Meeting and Exposition in Florida on December 6, 2025.

"The ASH (Free ASH Whitepaper) meeting is a fantastic opportunity for us to present the data and introduce EVX-04 to both scientists, doctors and potential business partners. We are thrilled to have been selected to do an oral presentation and are looking very much forward to share and discuss the data and concept," says Birgitte Rønø.

Presentation details
Abstract Title: Dark genome interrogation identifies novel antigens in acute myeloid leukemia – developing an off-the-shelf vaccine from machine learning to clinic
Abstract#: #278
Session: Emerging Tools, Techniques, and Artificial Intelligence in Hematology: MRD Assays and Novel Drug Discovery Pipelines
Location: Hyatt – Regency Ballroom R
Date/Time: December 6, 2025, at 2:00pm ET/20:00 CET
Presenter: Rasmus Villebro, Bioinformatics Manager at Evaxion

About ERVs
ERVs are remnants of ancient viruses lying dormant in our genome. ERVs are often overexpressed in cancer but not in healthy tissue, making them visible to the immune system and hence promising targets for cancer vaccines. AI-Immunology is crucial in allowing the identification of therapeutically relevant ERV tumor antigens from genomic patient tumor data.

About AML
AML is an aggressive hematologic malignancy characterized by the clonal expansion of undifferentiated myeloid precursor cells (AML blasts) in the bone marrow. The malignant proliferation leads to suppression of normal hematopoiesis, resulting in cytopenia, increased
susceptibility to infections, bleeding, and fatigue (Döhner et al. 2022).

If left untreated, the disease is fatal, often within weeks to months, with patients typically succumbing to infections within weeks to months.

(Press release, Evaxion Biotech, NOV 3, 2025, View Source [SID1234659253])