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The Candidate

Our tetravalent DR5 agonist.

INBRX-109, our tetravalent DR5 agonistic antibody, is designed to exploit tumor-biased direct cell death induction by DR5 activation in numerous cancer types.

With a valency of four, it has the ability to potently agonize DR5 through efficient receptor clustering, causing cell death, but by way of our sdAb platform, also eliminates recognition by pre-existing anti-drug antibodies (ADAs) to lessen the potential for hyper-clustering.

Valency Drives DR5-Mediated Apoptosis

Apoptosis is the death of cells that occurs as a normal and controlled part of an organism’s growth or development. DR5 requires the proper valency to trigger apoptosis of cancer cells—and spare healthy cells.

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Engineered to Avoid Hepatotoxicity

Human Hepatocyte Toxicity Assay

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  • Hepatocytes may be subject to on-target toxicity for DR5 pathway agonism.
  • Previous tetravalent DR5 agonists failed in the clinic due to hepatotoxicity—likely due to hyper-clustering by anti-drug antibodies.
  • In vitro hepatic cell (HepaRG) death assay recapitulates toxicity of TAS266 + pre-existing anti-drug antibodies (PE-ADAs) in pooled human immunoglobulins.
  • Proper valency is key: Hexavalent (Hex-1F5) is also hepatotoxic.
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INBRX-109 Clinical Trial

The Phase 1 trial for INBRX-109 is currently enrolling single agent dose expansion cohorts in Chondrosarcoma, Synovial Sarcoma, and Gastric Adenocarcinoma and will be soon enrolling combination treatment cohorts in Pancreatic Adenocarcinoma and Malignant Pleural Mesothelioma.

clinicaltrials.gov