• First‑in‑class DARKFOX‑targeting bispecific T cell engager: ENA101 is designed to selectively recognize the DARKFOX‑A3 peptide presented by HLA‑A*03:01, a highly prevalent HLA allele, enabling precise redirection of T cells to DARKFOX‑expressing tumor cells while sparing normal tissues.
• Potent and selective T cell–mediated anti‑tumor activity: ENA101 demonstrates robust T cell activation and tumor cell killing with low‑picomolar functional potency across multiple DARKFOX‑A3⁺ solid tumor models, with no activity observed in antigen‑negative controls.
• Compelling in vivo efficacy at low doses: In multiple xenograft models, once‑weekly dosing of ENA101 drove complete tumor regression across all dose levels tested, supporting strong translational potential.
• Drug-like properties supportive of clinical development: ENA101 exhibits high‑affinity binding to its target pHLA complex, favorable stability and manufacturability, and an extended plasma half‑life enabled by Enara’s proprietary EnTiCE® TCE platform.
• Broad clinical relevance of DARKFOX: Analyses demonstrate that DARKFOX is highly prevalent and homogeneously expressed across multiple high unmet need solid tumor indications, creating the opportunity for patient selection based on HLA‑A*03 positivity alone.
• Advancing into clinical development: ENA101 is advancing through IND-enabling studies with a clear development path to IND submission in 2H’2026.

Oxford, UK – April 20, 2026. Enara Bio, a pioneer in Dark Antigen® discovery and bispecific T cell engager (TCE) innovation, today announced the presentation of new preclinical data for ENA101, its first‑in‑class bispecific T cell engager (TCE), delivered today in an oral session at the American Association for Cancer Research (AACR) Annual Meeting 2026.

ENA101 targets DARKFOX®, a novel, cancer‑specific Dark Antigen encoded by a previously undiscovered alternative open reading frame (alt‑ORF) within FOXM1.  DARKFOX was discovered and validated using Enara’s proprietary EDAPT® platform and represents a new class of highly tumor‑specific targets derived from the dark proteome.

“ENA101 exemplifies the power of uncovering antigens within the dark proteome to overcome long-standing challenges in solid tumor immunotherapy,” said Dr. Joe Dukes, Chief Scientific Officer of Enara Bio. “The data presented today at AACR demonstrate that DARKFOX is a compelling cancer specific target and that ENA101 exhibits the potency, specificity and druglike profile required to advance a best-in-class T cell engager toward the clinic.”

The oral presentation, titled “ENA101: A First‑in‑Class Bispecific T Cell Engager Targeting a DARKFOX Peptide Presented by Solid Tumors,” was delivered by Dr. Joe Dukes in the Advances in Therapeutic Antibodies session
(Abstract #4052). The presentation highlighted the discovery of DARKFOX, the engineering of ENA101, and the comprehensive preclinical dataset supporting its advancement into clinical development.

Enara Bio is currently advancing ENA101 through IND-enabling studies to support IND filing in 2H’2026.

The abstract is available in Proceedings of the American Association for Cancer Research Annual Meeting 2026.

About ENA101
ENA101 is a first‑in‑class bispecific T cell engager developed using Enara Bio’s proprietary EnTiCE platform. It incorporates a high‑affinity TCR‑mimic binder targeting the DARKFOX‑A3 peptide, a clinically validated anti‑CD3 arm, and an Fc‑based architecture for half‑life extension, to enable potent, selective and durable anti‑tumor immune responses.

About Enara Bio
Enara Bio is shining a light on Dark Antigen® and T-cell biology to develop cancer immunotherapies designed to improve treatment outcomes for broad populations of cancer patients with solid tumors. Our pioneering EDAPT® platform enables us to discover cancer-specific antigens, including HLA-presented and cell surface antigens, from previously uncharted genomic ‘dark matter’. The result is a growing library of Dark Antigens that can address the need for novel, cancer-specific targets on solid tumors. Through our proprietary EnTiCE® platform, Enara is developing novel bispecific T cell engagers against Dark Antigen targets that are highly prevalent and homogenously expressed across solid tumors. Based in Oxford, UK, Enara Bio is backed by a strong syndicate of life science investors including RA Capital, Pfizer Ventures, M Ventures, Samsara BioCapital, SV Health Investors, and the Francis Crick Institute.

For more information, visit: www.enarabio.com.

Dark Antigen®, DARKFOX™, EDAPT® and EnTiCE® are trademarks of Enara Bio.

Contacts
Kevin Pojasek, President & CEO
info@enarabio.com

Stacey Davis, CBO & CFO
stacey.davis@enarabio.com

Frazer Hall, Mark Swallow
MEDiSTRAVA
enarabio@medistrava.com

###