Array BioPharma and Genentech's Strategic Alliance Voted Breakthrough Alliance of 2012

Array BioPharma Inc. (NASDAQ: ARRY) announced today that the strategic alliance between Array and Genentech, a member of the Roche Group (SIX: RO, ROG; OTCQX: RHHBY), has been honored with the Breakthrough Alliance Award of 2012. The award, sponsored by Deloitte Recap, was presented at the Allicense 2012 Conference in San Francisco. Annually, the Allicense Conference nominates five biotech-pharmaceutical alliances as the breakthrough deals of the previous year. The award is bestowed upon the alliance that receives the most votes by biotech and pharmaceutical business development and licensing executives.

"Our business strategy maximizes the value of our scientific innovations through strategic alliances, such as our alliance with Genentech,” said David Snitman, Ph.D., Chief Operating Officer and Vice President, Business Development, Array BioPharma. “I believe this alliance was distinguished due to its innovative deal structure, which truly aligns both parties to do what is in the best interest of science and patients. Array will receive the same economic terms for the development and commercialization of either company’s ChK-1 inhibitor, creating a real win-win for both companies. We are pleased to have received this recognition from our peers in the biotechnology and pharmaceutical industry.”

About the Array / Genentech Strategic Alliance

In August 2011, Array entered into an oncology agreement with Genentech for the development of each company’s small-molecule Checkpoint kinase 1 (ChK-1) program. The programs include Genentech’s compound GDC-0425 (RG7602), currently in Phase 1, and Array’s compound ARRY-575, which recently entered Phase 1. Under the terms of the agreement, Genentech is responsible for all clinical development and commercialization activities. Array received an upfront payment of $28 million and is eligible to receive clinical and commercial milestone payments up to $685 million and up to double-digit royalties on sales of any resulting drugs.

About Array BioPharma

Array BioPharma Inc. is a biopharmaceutical company focused on the discovery, development and commercialization of targeted small-molecule drugs to treat patients afflicted with cancer and inflammatory diseases. Array has four core proprietary clinical programs: ARRY-614 for myelodysplastic syndromes, ARRY-520 for multiple myeloma, ARRY-797 for pain and ARRY-502 for asthma. In addition, Array has 10 partner-funded clinical programs including two MEK inhibitors in Phase 2: selumetinib with AstraZeneca and MEK162 with Novartis. For more formation on Array, please go to www.arraybiopharma.com.

FORWARD-LOOKING STATEMENTS

This press release contains forward-looking statements within the meaning of the Private Securities Litigation Reform Act of 1995, including statements about the timing of the announcement of the results of clinical trials for our proprietary and our partnered programs, the time of the completion or initiation of further development of our partnered programs, our potential to earn future milestone and royalty payments under our collaboration agreements, expectations that events will occur that will result in greater value for the Company, the potential for the results of ongoing preclinical and clinical trials to support regulatory approval or the marketing success of a drug candidate, our ability to partner our proprietary drug candidates for up-front fees, milestone and/or royalty payments, our future plans to progress and develop our proprietary programs and the plans of our collaborators to progress and develop programs we have licensed to them. These statements involve significant risks and uncertainties, including those discussed in our most recent annual report filed on Form 10-K, in our quarterly reports filed on Form 10-Q, and in other reports filed by Array with the Securities and Exchange Commission. Because these statements reflect our current expectations concerning future events, our actual results could differ materially from those anticipated in these forward-looking statements as a result of many factors. These factors include, but are not limited to, our ability to continue to fund and successfully progress internal research and development efforts and to create effective, commercially viable drugs; risks associated with our dependence on our collaborators for the clinical development and commercialization of our out-licensed drug candidates; the ability of our collaborators and of Array BioPharma Inc. to meet objectives tied to milestones and royalties; our ability to effectively and timely conduct clinical trials in light of increasing costs and difficulties in locating appropriate trial sites and in enrolling patients who meet the criteria for certain clinical trials; risks associated with our dependence on third-party service providers to successfully conduct clinical trials within and outside the United States; our ability to achieve and maintain profitability and maintain sufficient cash resources; the extent to which the pharmaceutical and biotechnology industries are willing to in-license drug candidates for their product pipelines and to collaborate with and fund third parties on their drug discovery activities; our ability to out-license our proprietary candidates on favorable terms; and our ability to attract and retain experienced scientists and management. We are providing this information as of May 14, 2012. We undertake no duty to update any forward-looking statements to reflect the occurrence of events or circumstances after the date of such statements or of anticipated or unanticipated events that alter any assumptions underlying such statements.