Lilly and MacroGenics to develop and commercialize teplizumab

Eli Lilly and Company and MacroGenics, Inc. have announced that the two companies have entered into a global strategic alliance to develop and commercialize teplizumab, a humanized anti-CD3 monoclonal antibody, as well as other potential next generation anti-CD3 molecules for use in the treatment of autoimmune diseases.

As part of the deal, Lilly will acquire the exclusive rights to the molecule. Teplizumab is currently being studied in the PROTEGE trial, a global pivotal Phase II/III clinical trial for individuals with recent-onset type 1 diabetes. MacroGenics will continue to oversee the PROTEGE trial.

Under the terms of the agreement, MacroGenics will receive an initial payment of $41 million, as well as $3 million in other committed funds. MacroGenics may also receive up to $200 million in potential development milestones for the type 1 diabetes indication. If teplizumab is successfully commercialized, MacroGenics may receive up to $250 million in potential sales milestones and would receive escalating royalties on sales commensurate with the current stage of development of the product. In addition, MacroGenics would have the option to co-promote teplizumab for certain indications in the U.S. Lilly may make an equity investment in MacroGenics of up to $10 million in the company's next private financing round or initial public offering. Lilly may also decide to pursue several additional indications for teplizumab or other next generation anti-CD3 molecules developed with MacroGenics. If Lilly pursues each one of those indications and they all ultimately gain approval, additional milestone payments to MacroGenics could exceed $600 million. Other terms of the deal were not disclosed.

The transaction is expected to become effective in the fourth quarter of 2007, contingent upon clearance under the Hart-Scott-Rodino Anti-Trust Improvements Act, if required. At closing, Lilly would expect a charge to earnings for acquired in-process research and development. The amount of the charge has not yet been determined, but is estimated to be $0.03 per share. The impact to Lilly's fourth quarter and full-year 2007 earnings per share guidance is included in the 2007 Financial Guidance section of Lilly's third quarter financial results press release that was issued today.

"This agreement will expand Lilly's pipeline of late stage molecules and will strengthen one of our core therapeutic areas," said David Moller, M.D., Lilly, vice president of endocrine and cardiovascular research and clinical investigation. "We remain committed to maintaining our leadership role in diabetes care, including an expanded presence in the area of type 1 diabetes. We will continue to seek out innovative molecules to add to our diabetes portfolio in order to best respond to the growing health crisis posed by diabetes worldwide."

"Teplizumab is a significant addition to our growing portfolio of biotechnology-derived medicines, which are a key strategy for Lilly," said Thomas Bumol, Ph.D., Lilly, vice president, biotechnology discovery research, and president, Applied Molecular Evolution. "Immune tolerance represents a novel therapeutic approach to the treatment of autoimmune disease, and we are excited to be partnering with MacroGenics to clinically evaluate this mechanism in type 1 diabetes."

"We are delighted to enter into this deal with Lilly, an established leader in diabetes care, to develop teplizumab in multiple T-cell-mediated autoimmune diseases and to advance the molecule toward regulatory submission for recent-onset type 1 diabetes," stated Dr. Scott Koenig, president and CEO of MacroGenics. "We also look forward to working with Lilly to develop next generation CD3 product candidates to potentially treat a variety of autoimmune diseases, such as psoriasis and rheumatoid arthritis."

About Teplizumab

Teplizumab, also called MGA031, is a humanized, non-Fc receptor binding, anti-CD3 monoclonal antibody. Teplizumab binds to an epitope of the CD3- epsilon chain expressed on mature T lymphocytes and, by doing so, may modulate the pathological immunologic responses underlying multiple autoimmune diseases. Specifically, teplizumab may inhibit unwanted effector T cells and enhances beneficial regulatory T cell functions, thus promoting immune tolerance.

About the PROTEGE Trial

The PROTEGE trial, a global, pivotal Phase II/III clinical trial study, is evaluating the safety and efficacy of three teplizumab dosing regimens administered at the start of the study and again at six months in individuals with recent-onset type 1 diabetes ages 8 to 35 who are up to 12 weeks from their diagnosis.

Type 1 diabetes is an autoimmune disease in which the body's immune system attacks and destroys the insulin-producing beta cells of the pancreas. Researchers believe teplizumab may control the T lymphocytes that mediate destruction of the insulin-producing beta cells of the islets of the pancreas. In doing so, they believe teplizumab may have the ability to preserve and protect the remaining beta cells of the pancreas.

Additional information regarding the PROTEGE trial is available online at www.protegediabetes.org.