AMGEN AND ASTRAZENECA ANNOUNCE COLLABORATION TO JOINTLY DEVELOP AND COMMERCIALIZE CLINICAL- STAGE INFLAMMATION PORTFOLIO

AMGEN AND ASTRAZENECA ANNOUNCE COLLABORATION TO JOINTLY DEVELOP AND COMMERCIALIZE CLINICAL- STAGE INFLAMMATION PORTFOLIO
Collaboration Comprises Five Monoclonal Antibodies Brodalumab (AMG 827) Phase 3 Trial Planned in 2012

THOUSAND OAKS, Calif. and LONDON (April 2, 2012) – Amgen (NASDAQ:AMGN) and AstraZeneca Plc, today announced an agreement to jointly develop and commercialize five monoclonal antibodies from Amgen's clinical inflammation portfolio (AMG 139, AMG 157, AMG 181, AMG 557 and brodalumab (AMG 827)).


The companies believe all the molecules have novel profiles and offer the potential to deliver important treatments across multiple indications in inflammatory diseases. The collaboration will provide Amgen with additional resources to optimally progress its portfolio, and Amgen will benefit from the strong respiratory, inflammation and asthma development expertise of MedImmune, AstraZeneca's biologics arm. The collaboration will also capitalize on AstraZeneca's global commercial reach in respiratory and gastrointestinal diseases. The agreement does not include certain territories previously partnered by Amgen for brodalumab with Kyowa Hakko Kirin and AMG 557 with Takeda.

Under the terms of the agreement, AstraZeneca will make a one-time $50 million upfront payment and the companies will share both costs and profits. Based on current plans, approximately 65 percent of costs for the 2012-2014 period will be funded by AstraZeneca. Thereafter, the companies will split costs equally. Amgen will book sales globally and will retain a low single-digit royalty for brodalumab and a mid single-digit royalty for the rest of the portfolio, after which the companies will share profits equally.

AstraZeneca will lead the development and commercial strategy of AMG 139, AMG 157 and AMG 181, while Amgen will lead the development and commercial strategy of brodalumab and AMG 557. Each development and commercialization lead will be under the oversight of joint governing bodies. For brodalumab, commercial promotion will be split. Amgen will promote in dermatology indications in the United States (U.S.) and Canada, and in rheumatology indications in the U.S., Canada and Europe. AstraZeneca will promote in respiratory and, initially, in dermatology indications of brodalumab across all territories outside the U.S., Canada and those markets where Amgen has existing partnerships. Allocation of promotional rights for other territories, indications and molecules will be agreed later between the companies.


"We are delighted to join forces with Amgen in developing and commercializing these novel clinical-stage assets that add value to our pipeline and build on our expertise in biologics. This creative collaboration will make the most of both companies' respective capabilities, including AstraZeneca's extensive global reach, to help bring these potentially innovative treatment options for a variety of respiratory and inflammatory diseases to patients around the world," said David Brennan, Chief Executive Officer, AstraZeneca.


"We are very excited at the prospect of collaborating with a well-respected organization like AstraZeneca to advance our inflammation pipeline," said Kevin Sharer, Chairman and CEO at Amgen. "We believe this collaboration has the potential to bring more therapies to patients sooner, across more geographic areas. We are impressed with AstraZeneca's extensive experience in developing and launching products in the respiratory and gastroenterology areas, and believe this collaboration is an opportunity to work with a partner that has leading regulatory and commercial expertise in inflammation indications."

NOTES TO EDITORS
About the inflammation portfolio included in the agreement
Under the agreement, the companies will jointly develop and commercialize the following five assets from Amgen's clinical-stage portfolio:

•    Brodalumab (AMG 827) is a human monoclonal antibody that binds to and blocks signaling
via the IL-17 receptor. Brodalumab is being investigated for psoriasis (completed Phase 2
and planned Phase 3), psoriatic arthritis (Phase 2) and asthma (Phase 2).

•    AMG 139 is a human monoclonal antibody. AMG 139 is being investigated in Phase 1b for
Crohn's disease.

•    AMG 181 is a human monoclonal antibody. AMG 181 is being investigated in Phase 1a and
Phase 1b for ulcerative colitis and Crohn's disease.

•    AMG 557 is a human monoclonal antibody that binds to B7-related protein 1 (B7RP-1).
AMG 557 is being investigated in Phase 1b for autoimmune diseases such as systemic
lupus erythematosus.

•    AMG 157 is a human monoclonal antibody that blocks interaction of thymic stromal
lymphopoietin (TSLP) with the TSLP receptor. AMG 157 is being investigated in Phase 1b for asthma.

About Amgen
Amgen discovers, develops, manufactures and delivers innovative human therapeutics. A biotechnology pioneer since 1980, Amgen was one of the first companies to realize the new science's promise by bringing safe and effective medicines from lab, to manufacturing plant, to patient. Amgen therapeutics have changed the practice of medicine, helping millions of people around the world in the fight against cancer, kidney disease, rheumatoid arthritis, bone disease and other serious illnesses. With a deep and broad pipeline of potential new medicines, Amgen remains committed to advancing science to dramatically improve people's lives. To learn more about our pioneering science and our vital medicines, visit www.amgen.com. Follow us on www.twitter.com/amgen.

About AstraZeneca

AstraZeneca is a global, innovation-driven biopharmaceutical business with a primary focus on the discovery, development and commercialization of prescription medicines for gastrointestinal, cardiovascular, neuroscience, respiratory and inflammation, oncology and infectious disease. AstraZeneca operates in over 100 countries and its innovative medicines are used by millions of patients worldwide. For more information please visit: www.astrazeneca.com.
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AMGEN AND ASTRAZENECA ANNOUNCE COLLABORATION TO JOINTLY DEVELOP AND COMMERCIALIZE CLINICAL-STAGE INFLAMMATION PORTFOLIO Page 4 regulations and reimbursement policies may affect the development, usage and pricing of Amgen's products. In addition, Amgen competes with other companies with respect to some of its marketed products as well as for the discovery and development of new products. Amgen believes that some of its newer products, product candidates or new indications for existing products, may face competition when and as they are approved and marketed. Amgen's products may compete against products that have lower prices, established reimbursement, superior performance, are easier to administer, or that are otherwise competitive with its products. In addition, while Amgen routinely obtains patents for its products and technology, the protection offered by its patents and patent applications may be challenged, invalidated or circumvented by its competitors and there can be no guarantee of Amgen's ability to obtain or maintain patent protection for its products or product candidates. Amgen cannot guarantee that it will be able to produce commercially successful products or maintain the commercial success of its existing products. Amgen's stock price may be affected by actual or perceived market opportunity, competitive position, and success or failure of its products or product candidates. Further, the discovery of significant problems with a product similar to one of Amgen's products that implicate an entire class of products could have a material adverse effect on sales of the affected products and on Amgen's business and results of operations.
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