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AGEN1223

Bispecific antibody · Immune activation, directed at undisclosed antigen 1 on tumor-infiltrating Tregs and undisclosed antigen 2 on tumor-infiltrating Tregs · developed by Agenus

Phase 1 Most advanced trial (none active)
AGEN Developer
1 Registered trials

What is AGEN1223?

AGEN1223 is a bispecific antibody that binds two undisclosed antigens co-expressed on tumor-infiltrating regulatory T cells. It selectively depletes immunosuppressive Tregs in the tumor microenvironment while sparing peripheral Tregs and effector T cells, and may co-stimulate antigen-specific effector T cells. It is studied in advanced solid tumors.

Summary written with AI from the sources listed at the end of this page.

At a glance

Drug type
Bispecific antibody
Targets
undisclosed antigen 1 on tumor-infiltrating Tregs, undisclosed antigen 2 on tumor-infiltrating Tregs
Mechanism
Immune activation, directed at undisclosed antigen 1 on tumor-infiltrating Tregs and undisclosed antigen 2 on tumor-infiltrating Tregs
Pathways
antitumor response, Treg depletion
Therapy area
Oncology
Developer
Agenus Inc. (AGEN)
FDA status
Investigational, not approved in the US. Most advanced trial: Phase 1

🧪 Clinical trials

TrialPhaseConditionStatusSponsor
NCT04156100 Phase 1 Advanced Solid Tumor Terminated AGEN

Trials of the companies BioRadar tracks, from ClinicalTrials.gov, most advanced phase first.

Conditions studied

Advanced Solid Tumor

More from Agenus

Sources

Updated Oct 3, 2026. Something wrong or missing? Report it on the AGEN page.

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Data: FDA (Drugs@FDA, Purple Book, DailyMed), NIH (NCI Thesaurus, GSRS, RxNorm), ClinicalTrials.gov • Informational purposes only, not medical or investment advice. • All drugs A–Z

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