AVEO scientists have demonstrated through the use of our Human Response Platform™ the importance of ErbB3 in promoting tumor growth. An increasing body of evidence also implicates the activation of ErbB3 in tumorigenesis and the development of resistance to anti-cancer agents. AV-203 is a clinical-stage ErbB3 (HER3) inhibitory antibody candidate designed to inhibit both ligand-dependent and ligand-independent ErbB3 signaling. ErbB3 is a receptor that is typically expressed in many human cancers, and AV-203 has demonstrated preclinical activity in a number of different tumor models including breast, head and neck, lung, ovarian and pancreatic cancers.

AVEO has successfully completed a Phase 1 safety study showing no dose limiting toxicities at maximum dose of 20mg/kg and CLIA (Clinical Laboratory Improvements Amendment) validation has been completed for a biomarker for potential patient selection. Results from this study are expected be presented at a scientific meeting in 2014.

AVEO is evaluating opportunities to accelerate further development of AV-203 through external funding.

About ErbB3

ErbB3 belongs to a family of four proteins that also includes EGFR (HER1) and HER2 tyrosine kinase receptors. ErbB3 is a potent stimulator of cancer growth and survival, and its overexpression generally correlates with poor prognosis. AV-203 selectively targets the receptor ErbB3, a new and promising strategy for treating cancer, both for direct anti-tumor activity and for prevention of treatment resistance.