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AbbVie, CytomX to co-develop for Probody Drug Conjugates

Research Insight
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AbbVie and CytomX Therapeutics, Inc announced that they have entered into a collaboration to co-develop and co-commercialize Probody™ Drug Conjugates against CD71, also known as transferrin receptor 1 (TfR1). CD71 is highly expressed in a number of solid and hematologic cancers and has attractive molecular properties for efficient delivery of cytotoxic payloads to tumor cells. Probody therapeutics are designed to take advantage of unique conditions in the tumor microenvironment to enhance the tumor-targeting features of an antibody and reduce drug activity in healthy tissues.

Steve Davidsen, Ph.D., vice president, oncology drug discovery, AbbVie said,We believe that the Probody platform provides a differentiated opportunity to combine with our strength in antibody drug conjugates,we are encouraged by the promising preclinical data that CytomX has generated for their Probody drug conjugate programs to-date and look forward to working closely with their team. This collaboration will enable us to expand our innovative pipeline in antibody drug conjugates and leverage our strength in that area to previously unexplored targets.

This collaboration is another important step toward achieving CytomX's vision of transforming lives with safer, more effective therapies and allows us to further advance our broad pipeline of Probody therapeutics, stated Sean McCarthy, D.Phil., president and chief executive officer at CytomX. "AbbVie has demonstrated leadership in developing antibody drug conjugates and we look forward to collaborating with their team to realize the full potential of our CD71 Probody drug conjugate program and additional oncology targets.

Probody therapeutics are designed to remain inactive until they are activated by proteases in the tumor microenvironment. As a result, Probody therapeutics bind selectively to tumors and avoid binding to healthy tissue, to minimize toxicity and potentially create safer, more effective therapies. CytomX has generated preclinical data that demonstrates that Probody drug conjugates can safely and effectively target tumor antigens, such as CD71, that are not addressable by conventional antibody-drug conjugates.

Under the terms of the agreement, CytomX and AbbVie will co-develop a Probody drug conjugate against CD71, with CytomX leading pre-clinical and early clinical development. AbbVie will lead later development and commercialization, with global late-stage development costs shared between the two companies. CytomX will receive an upfront payment of $30 million and is eligible to receive up to $470 million in development, regulatory and commercial milestones, pending the achievement of pre-determined outcomes. AbbVie will lead global commercial activities with CytomX eligible to receive a profit share in the U.S. and tiered double-digit royalties on net product sales outside of the U.S. CytomX retains an option to co-promote in the U.S. .

AbbVie also receives exclusive worldwide rights to develop and commercialize Probody drug conjugates against up to two additional, undisclosed targets. Should AbbVie ultimately pursue these targets, CytomX is eligible to receive additional milestone and royalty payments per target on any resulting products.

About AbbVie

AbbVie is a global, research-based biopharmaceutical company formed in 2013 following separation from Abbott Laboratories. The company's mission is to use its expertise, dedicated people and unique approach to innovation to develop and market advanced therapies that address some of the world's most complex and serious diseases. Together with its wholly-owned subsidiary, Pharmacyclics, AbbVie employs more than 28,000 people worldwide and markets medicines in more than 170 countries.

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