Merck Serono Acquires Rights to PI-2301 Program for Multiple Sclerosis

GENEVA, Switzerland, September 19, 2011 -

Merck Serono, a division of Merck KGaA, Darmstadt, Germany, today announced that it has acquired worldwide exclusive rights to PI-2301, an experimental drug for multiple sclerosis, previously developed by Peptimmune Inc. PI-2301 has completed Phase 1b in multiple sclerosis and is ready to initiate phase 2 clinical trials.

“Over the years we have continuously worked on developing innovative treatment options that meet the individual needs of people living with multiple sclerosis,” said Susan Herbert, Head of Global Portfolio Development at Merck Serono. “We are pleased to strengthen our development pipeline with the PI-2301 compound, which could play a valuable role in the treatment of this debilitating disease.”

The acquisition of PI-2301 covers its worldwide exclusive development and commercialization rights.

PI-2301 is a second-generation peptide copolymer that is thought to enhance the regulatory response of the immune system. Merck Serono will investigate the application of this product in autoimmune diseases such as multiple sclerosis.

About multiple sclerosis

Multiple sclerosis (MS) is a chronic, inflammatory condition of the central nervous system and is the most common, non-traumatic, disabling neurological disease in young adults. It is estimated that approximately two million people have MS worldwide. While symptoms can vary, the most common symptoms of MS include blurred vision, numbness or tingling in the limbs and problems with strength and coordination. The relapsing forms of MS are the most common.

About Merck Serono and multiple sclerosis

Merck Serono is a leader in multiple sclerosis (MS) with Rebif^® (interferon beta-1a), a disease-modifying drug used to treat relapsing forms of MS, which is registered in more than 80 countries worldwide. Full prescribing information for this product can be obtained by contacting the Company or visiting its website. Additional therapeutic options are currently under development at Merck Serono, including several products in early stage development. Merck Serono is also taking a leading role in developing an understanding of the role of genetics in MS.

About Merck Serono

Merck Serono is the biopharmaceutical division of Merck KGaA, Darmstadt, Germany, a global pharmaceutical and chemical company. Headquartered in Geneva, Switzerland, Merck Serono discovers, develops, manufactures and markets prescription medicines of both chemical and biological origin in specialist indications. In the United States and Canada, EMD Serono operates as a separately incorporated affiliate of Merck Serono.

Merck Serono has leading brands serving patients with cancer (Erbitux®, cetuximab), multiple sclerosis (Rebif®, interferon beta-1a), infertility (Gonal-f®, follitropin alfa), endocrine and metabolic disorders (Saizen® and Serostim®, somatropin), (Kuvan®, sapropterin dihydrochloride), (Egrifta®, tesamorelin), as well as cardiometabolic diseases (Glucophage®, metformin), (Concor®, bisoprolol), (Euthyrox®, levothyroxine). Not all products are available in all markets.

With an annual R&D expenditure of over € 1bn, Merck Serono is committed to growing its business in specialist-focused therapeutic areas including neurodegenerative diseases, oncology, fertility and endocrinology, as well as new areas potentially arising out of research and development in rheumatology.

About Merck

Merck is a global pharmaceutical and chemical company with total revenues of € 9.3 billion in 2010, a history that began in 1668, and a future shaped by more than 40,000 employees in 67 countries. Its success is characterized by innovations from entrepreneurial employees. Merck’s operating activities come under the umbrella of Merck KGaA, in which the Merck family holds an approximately 70% interest and shareholders own the remaining approximately 30%. In 1917 the U.S. subsidiary Merck & Co. was expropriated and has been an independent company ever since.

For more information, please visit www.merckserono.com or www.merckgroup.com

Merck Serono S.A. Genf, 9 Chemin des Mines, 1202 Genf, Schweiz, Media Relations, Tel: +41-22-414-36-00