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Pfizer Stops Clinical Trials of Thelin® and Initiates Voluntary Product Withdrawal in the Interest of Patient Safety
Date:12/10/2010

NEW YORK, Dec. 10, 2010 /PRNewswire-FirstCall/ -- Pfizer Inc. (NYSE: PFE) announced today that, in the interest of patient safety, it is voluntarily withdrawing Thelin® (sitaxentan) for the treatment of pulmonary arterial hypertension (PAH) in regions where it is approved (the European Union, Canada and Australia).  In addition, Pfizer is discontinuing clinical studies of Thelin worldwide.

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Pfizer's decision was based on a review of emerging safety information from clinical trials and post-marketing reports.  While liver toxicity is a known complication of the class of drugs to which Thelin belongs, a new potentially life-threatening idiosyncratic risk of liver injury with Thelin has been observed. Given the availability of alternate treatments, Pfizer has concluded that the overall benefit of Thelin no longer outweighs the risk in the general population of PAH patients.  The Company has notified health authorities about this finding and its decision to voluntarily withdraw Thelin from the market and stop clinical studies.  

"Pfizer's priority is to ensure the safety and well-being of patients, and we are in the process of communicating all of this information to the appropriate medical professionals and regulatory authorities in all regions as quickly as possible," said Cara Cassino, MD, vice president, Clinical Development and Medical Affairs for Pfizer's Pulmonary Vascular Disease unit.

Pfizer recommends that no new patients be prescribed Thelin and that patients receiving Thelin be transitioned to appropriate alternate therapies as soon as safely possible according to best local practice.  Patients taking Thelin or participating in Thelin studies are advised to consult with their health care professional as soon as possible.  Patients should not stop taking Thelin until they speak to their health care professional.  

For further information, contact the local Pfizer Country office. (Pfizer country websites can be accessed at http://www.pfizer.com/general/global_sites.jsp.)

Thelin is approved in the European Union, Australia and Canada to treat patients with pulmonary arterial hypertension.  Pulmonary arterial hypertension is a rare, progressive, life-threatening disease that may result in heart failure and premature death.  Pfizer remains committed to research in pulmonary vascular disease.

Prescribing information for Thelin from countries where it is currently approved is available at the following links:


Pfizer Inc: Working together for a healthier world™

At Pfizer, we apply science and our global resources to improve health and well-being at every stage of life. We strive to set the standard for quality, safety and value in the discovery, development and manufacturing of medicines for people and animals. Our diversified global health care portfolio includes human and animal biologic and small molecule medicines and vaccines, as well as nutritional products and many of the world's best-known consumer products. Every day, Pfizer colleagues work across developed and emerging markets to advance wellness, prevention, treatments and cures that challenge the most feared diseases of our time. Consistent with our responsibility as the world's leading biopharmaceutical company, we also collaborate with health care providers, governments and local communities to support and expand access to reliable, affordable health care around the world. For more than 150 years, Pfizer has worked to make a difference for all who rely on us. To learn more about our commitments, please visit us at www.pfizer.com.

About Pfizer's Specialty Care Business

Pfizer's Specialty Care Business Unit is the world's largest specialty pharmaceuticals business, with a commitment to the eradication, remission and relief of serious diseases. Pfizer's Specialty Care Business is committed to bringing together the best scientific minds to challenge the most feared diseases of our time. 


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