Thursday, December 28, 2006

MedImmune In-Licenses Novel Inflammatory Disease Target

GAITHERSBURG, Md., December 28, 2006 /PRNewswire-FirstCall/ -- MedImmune, Inc. announced today that it intends to develop a monoclonal antibody (MAb) targeting pathways within the CD28 receptor family for treatment of certain inflammatory diseases under a recently signed license agreement with Japan Tobacco, Inc. (JT). MedImmune's initial efforts will focus on developing the current lead antibody, which aims to inhibit a receptor believed to play a key role in controlling adaptive immune responses, called inducible-costimulator (ICOS), and thereby regulate T-cell dependent activation of B cells. Inappropriate activation of T cells resulting in B-cell activation is implicated in a variety of autoimmune disorders.

"The addition of this novel target to MedImmune's inflammatory disease pipeline underscores our commitment to developing innovative therapies for the treatment of unmet medical needs, such as systemic lupus erythematosus (SLE or lupus), Sjogrens syndrome and rheumatoid arthritis," said Anthony J. Coyle, Ph.D., MedImmune senior director, research, and head, inflammation biology. "As we work to develop the anti-ICOS MAb as a potential treatment for such immune system disorders, we also hope to continue to collect scientific knowledge related to the role of signaling pathways in regulating immune response outcomes."

Under the terms of the agreement, JT will receive an undisclosed upfront payment, milestone payments and royalties on any future marketed products. JT retains exclusive development and marketing rights for the current lead antibody in Japan. MedImmune has exclusive development and marketing rights to this antibody for the rest of world and certain rights worldwide for other antibodies developed as a result of the agreement.

About Anti-ICOS MAbs

Preclinical study results indicate that ICOS is only expressed on a subset of T cells and is essential for T-cell dependent B-cell activation. In addition, ICOS is required for IL-17 secretion from activated T cells. IL-17 is a T-cell derived cytokine that is implicated in the development of various inflammatory diseases, including rheumatoid arthritis. In preclinical studies, ICOS-inhibition with MAbs was shown to be effective in models of rheumatoid arthritis, asthma, multiple sclerosis and lupus.

About Japan Tobacco

Japan Tobacco Inc. is the world's third largest international manufacturer of tobacco products. Since its privatization in 1985, JT has actively diversified its operations into pharmaceuticals and foods. JT entered into the pharmaceutical business in 1987 and established the Central Pharmaceutical Research Institute in 1993. JT is currently engaged in the research and development of new drugs in various areas such as glucose and lipid metabolism, anti-virus, immune disorders and inflammation, and bone metabolism. The company's net sales were 4.637 trillion yen in the fiscal year that ended March 31, 2006.

About MedImmune

MedImmune strives to provide better medicines to patients, new medical options for physicians, rewarding careers to employees, and increased value to shareholders. Dedicated to advancing science and medicine to help people live better lives, the company is focused on the areas of infectious diseases, cancer and inflammatory diseases. With more than 2,500 employees worldwide, MedImmune is headquartered in Maryland. For more information, visit the company's website at

This announcement contains, in addition to historical information, certain "forward-looking statements" regarding the development of inflammatory disease product candidates by MedImmune, Inc. Such forward-looking statements are based on current expectations and involve inherent risks and uncertainties, including factors that could delay, divert or change current expectations and could cause actual outcomes and results to differ materially from current expectations. In addition, MedImmune can provide no assurance that these products will be commercially successful. In addition to risks and uncertainties disclosed in MedImmune's filings with the U.S. Securities and Exchange Commission, no assurance exists that development efforts for these products will succeed, that these products will receive required regulatory approval or that, even if regulatory approval is received, they will be commercially successful. MedImmune undertakes no obligation to update any forward-looking statement, whether as a result of new information, future events or otherwise except as may be required by applicable law or regulation.

CONTACT: Media: Jamie Lacey, +1-301-398-4035, or Investors: Peter Vozzo,+1-301-398-4358, both of MedImmune, Inc.

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Ticker Symbol: (NASDAQ-NMS:MEDI)

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