Sanofi-aventis and Exelixis, Inc announced a global license agreement for XL147 and XL765 and an exclusive collaboration for the discovery of inhibitors of phosphoinositide-3 kinase (PI3K) for the management of solid malignancies. Activation of the PI3K pathway is a frequent event in human tumours, promoting cell proliferation and cell survival, as well as resistance to chemotherapy and radiotherapy. Under the license agreement, sanofi-aventis will have an exclusive worldwide license to XL147, an oral PI3K inhibitor, and XL765, an oral dual inhibitor of PI3K and mTOR (mammalian target of rapamycin); both are currently in phase-1 clinical trials. Sanofi-aventis will have sole responsibility for all subsequent clinical, regulatory, manufacturing and commercial activities. Exelixis will participate in ongoing and potential future clinical trials.

Under the exclusive discovery collaboration, sanofi-aventis and Exelixis will combine research efforts to establish several preclinical programs related to isoform-selective inhibitors of PI3K. Sanofi-aventis will have sole responsibility for all subsequent clinical, regulatory, commercial and manufacturing activities of the products that result from the collaboration. However, Exelixis may be responsible for conducting certain clinical trials.

"We are very excited about integrating such novel targeted therapies with high therapeutic potential in our portfolio," said Marc Cluzel, senior vice-president R&D, sanofi-aventis. "We look forward to combining our efforts with Exelixis to develop innovative drugs in the best interest of patients suffering from cancers. This alliance is aligned with our strategy to create value through strategic partnerships that deliver new therapeutic options."

Under the terms of the agreements, sanofi-aventis will pay Exelixis an upfront cash payment as well as development and regulatory milestone payments that could reach over $1 billion in aggregate for existing and future programmes under both agreements. In addition, Exelixis will be entitled to receive royalties and commercial milestones on sales when products are commercialized. The license agreement is subject to antitrust clearance under the Hart-Scott-Rodino Antitrust Improvements Act.

The phosphoinositide-3-kinase (PI3K) pathway is triggered in normal cells upon exposure to growth factors. XL147 is an orally available small molecule inhibitor of phosphoinositide-3-kinase (PI3K). XL765 is an orally available small molecule, dual inhibitor of PI3K and mTOR (mammalian target of rapamycin).

Exelixis is a development-stage biotechnology company dedicated to the discovery and development of novel small molecule therapeutics for the treatment of cancer and other serious diseases.