Alexion Pharmaceuticals Inc. to Present at the William Blair 27th Annual Growth Stock Conference

CHESHIRE, Conn., June 13 /PRNewswire-FirstCall/-- Alexion Pharmaceuticals, Inc. today announced that Vikas Sinha, Senior Vice President and Chief Financial Officer of Alexion Pharmaceuticals, will present at the William Blair 27th Annual Growth Stock Conference in Chicago at 3:00 p.m., local time (4:00 p.m., eastern) on Wednesday, June 20, 2007.

An audio webcast of Mr. Sinha’s remarks will be available live. You can access the webcast at: www.alexionpharm.com. An archived version of the remarks will also be available through the Company’s web site for a limited time following the conference.

Alexion Pharmaceuticals, Inc.

CONTACT: Leonard Bell, M.D., Chief Executive Officer, AlexionPharmaceuticals, Inc., +1-203-272-2596; media, David Patti, Makovsky +Company, +1-212-508-9623, investors, Rhonda Chiger, Rx Communications,+1-917- 322-2569, both for Alexion Pharmaceuticals, Inc.

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