Oncothyreon and Array Announce Collaboration

Oncothyreon Inc.

and Array BioPharma Inc.

today announced that they will collaborate to develop and commercialize ARRY-380, an orally active, reversible and selective small-molecule HER2 inhibitor. HER2, also known as ErbB2, is a receptor tyrosine kinase that is over-expressed in breast cancer and other cancers such as gastric and ovarian cancer. Array previously completed a Phase 1 clinical trial of ARRY-380 in patients with heavily pre-treated metastatic breast cancer which demonstrated that the compound was well tolerated and had anti-tumor activity.  (Logo:  http://photos.prnewswire.com/prnh/20121029/LA02195LOGO) Oncothyreon has agreed to pay Array an upfront fee of $10 million upon initiation of the collaboration. Under the agreement, Oncothyreon will fund and conduct the clinical development of ARRY-380 through a defined set of combination proof-of-concept trials in patients with metastatic breast cancer, including patients with brain metastases. ARRY-380 has demonstrated superior activity, based on overall survival, compared to Tykerb® (lapatinib) and to the investigational drug, neratinib, in an intracranial HER2+ breast cancer xenograft model. This provides a strong rationale to explore whether ARRY-380 can provide benefit to patients with brain