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Spirogen and BioAtla Present Positive Data on Next-Generation Warheads in ADCs Against Cancer

Published: Monday, April 08, 2013
Last Updated: Monday, April 08, 2013
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Data demonstrating excellent specificity presented at AACR.

Spirogen and BioAtla LLC announced new data on the use of pyrrolobenzodiazepine (PBD) dimers as warheads in antibody drug conjugates (ADCs) at the annual meeting of the American Association for Cancer Research (AACR) in Washington, DC.

The study evaluated the efficacy of five ADCs against solid and hematological cancer targets.  The hematological target antibody was engineered using BioAtla’s proprietary CIAO™ and BioAcceleration™ technologies and conjugated to Spirogen’s cytotoxic PBD dimers. Trastuzumab ADCs were tested against Her2-expressing human breast cancer in vivo.

For both tumour types data showed that the ADCs achieved durable complete regression and tumor free survival. The PBD dimers were not found to be cross-resistant with widely-used chemotherapeutic agents.

Professor John Hartley, lead author of the study and Director of Pre-clinical Development at Spirogen, said: “Significant activity at remarkably low doses and at low drug-antibody ratios was seen in all tumor types we studied. Antibody-PBD conjugates are the most promising next-generation oncology compounds for clinical development.”

Dr Jay M Short, Chairman and CEO of BioAtla, said: “By pairing our technologies with Spirogen’s warheads, we have achieved affinity and efficient internationalisation of these exciting novel ADCs.”


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