TOKYO, MUNICH, Germany and EDISON, New Jersey, December 7 /PRNewswire/ --

- ENGAGE-AF TIMI 48 Trial to Study 16,500 Patients in More Than 1,400 Centers Globally

DAIICHI SANKYO Company, Limited (TSE: 4568), announced today that it has initiated its pivotal Phase III trials for DU-176b, an investigational oral Factor Xa inhibitor, in patients with atrial fibrillation. DU-176b is being developed solely by DAIICHI SANKYO.

The Phase III global study, Effective Anticoagulation with Factor Xa Next Generation in Atrial Fibrillation (ENGAGE-AF TIMI 48), will compare DU-176b with warfarin in preventing stroke and systemic embolic events (SEE) in patients with atrial fibrillation. The primary safety assessment will be the incidence of bleeding.

Results from recently presented Phase II safety studies showed that the incidence of major and clinically relevant non-major bleeding events reported in the once-daily DU-176b treatment groups (30 mg or 60 mg) were similar to that in the warfarin-treated patient group. The incidence of major and clinically relevant non-major bleeding events was significantly higher in the twice-daily DU-176b treatment groups (30 mg or 60 mg), compared to the warfarin group. The Phase III study will therefore randomize approximately 16,500 patients to one of three treatment groups: 30 mg DU-176b once daily, 60 mg DU-176b once daily, or warfarin. Those randomized to warfarin will be dosed once daily with dose adjustments to maintain International Normalized Ratio (INR) between 2.0 and 3.0.

This is an event-driven, Phase III, multi-national, randomized, double-blind study with sites in North and South America, Africa, Asia, Europe, Australia and New Zealand. The expected median treatment duration of the study is 24 months; DAIICHI SANKYO expects the study to conclude in the first half of 2012.

There is a need for a safe and effective option for the prevention of clotting or stroke in patients with atrial fibrillation other than the current standard of care, warfarin, which requires extensive monitoring and poses potentially serious drug and food interactions, said John Alexander, M.D., M.P.H., global head of research and development, DAIICHI SANKYO Company, Limited. The start of our Phase III trial marks an important milestone in the clinical development of DU-176b and we hope this compound will prove to be another successful treatment in our cardiovascular portfolio.

About Atrial Fibrillation

Atrial fibrillation (AF) is an irregular heartbeat caused when the upper chambers of the heart (the atria) beat inconsistently and rapidly. When this happens, blood can become stagnant near the walls of the atria and form blood clots. These blood clots can break off and travel through the blood stream to the brain where they can block blood vessels possibly causing a stroke. These clots can also cause damage to other organs in the body by blocking peripheral arteries. About 4.5 Million people in Europe have atrial fibrillation.(1) Patients with atrial fibrillation have five times higher risk of having a stroke.(2) These patients also tend to have more serious first strokes than patients without atrial fibrillation, resulting in higher mortality rates and longer hospital stays.(3)

References

1. ACC/AHA/ESC 2006 Guidelines for the Management of Patients with Atrial Fibrillation. Europace 2006;8:651-745

2. Hylek AM, et al. N Engl J Med. 2003; 349:1019-1026.

3. Jorgensen, H.S., et.al. Stroke 1996;27: 1765-1769

About DU-176b

DU-176b is an oral anticoagulant that directly inhibits Factor Xa, a clotting factor in the blood. DAIICHI SANKYO is developing DU-176b as a potential new treatment for the prevention of both arterial and venous thromboembolism. Notably, DAIICHI SANKYO has more than 25 years experience conducting research in the area of Factor Xa inhibition and was the first company to test these molecules in man.

About DAIICHI SANKYO

DAIICHI SANKYO is a global pharmaceutical company that focuses on researching and marketing innovative medications. The company was created in 2005 through the merger of two traditional Japanese enterprises, Daiichi and Sankyo. With net sales of more than 5.4 billion EUR in fiscal year 2007, DAIICHI SANKYO is one of the world's 20 leading pharmaceutical companies. The company's world headquarters is in Tokyo, and its European base is located in Munich. DAIICHI SANKYO has affiliates in 12 European countries and has been one of the strongest Japanese pharmaceutical companies located in Europe since it set up European production facilities and marketing offices in 1990. The company's research activities focus on the areas of cardiovascular diseases, hematology, diabetes, anti-infectives and cancer. Its aim is to develop medications that are best in their class or to create new classes of pharmaceutical drugs. For more information, please visit: http://www.daiichi-sankyo.eu

Forward-looking statements

This press release contains forward-looking statements and information about future developments in the sector, and the legal and business conditions of DAIICHI SANKYO EUROPE GmbH. Such forward-looking statements are uncertain and are subject at all times to the risks of change, particularly to the usual risks faced by a global pharmaceutical company, including the impact of the prices for products and raw materials, medication safety, changes in exchange rates, government regulations, employee relations, taxes, political instability and terrorism as well as the results of independent demands and governmental inquiries that affect the affairs of the company. All forward-looking statements contained in this release hold true as of the date of publication. They do not represent any guarantee of future performance. Actual events and developments could differ materially from the forward-looking statements that are explicitly expressed or implied in these statements. DAIICHI SANKYO EUROPE GmbH assumes no responsibility for the updating of such forward-looking statements about future developments of the sector, legal and business conditions and the company.

Contact: Media, Dr. Thomas Portz, Corporate Communications, Phone +49(0)89-78-08-468, thomas.portz@daiichi-sankyo.eu; Medical, Dr. Felix Münzel, Medical/Scientific Affairs CV Europe, Phone +49(0)89-78-08-471, felix.muenzel@daiichi-sankyo.eu; Media, Toshiaki Sai, Daiichi Sankyo Company, Limited (Tokyo), Phone: +81-3-6225-1126