( that results ofclinical trials are not...)Studies Show Efficacy and Safety of Alexion's Soliris in Broad,Population of PNH Patients,Health

that results of clinical trials are not predictive of safety and efficacy results of Soliris in broader patient populations, the risk that third parties won't agree to license any necessary intellectual property to us on reasonable terms, the risk that third party payors will not reimburse for the use of Soliris at acceptable rates or at all, the risk that Soliris will not generate interest among physicians, the risk that estimates regarding the number of PNH patients are inaccurate, the risk that pending litigation may be resolved adversely, and a variety of other risks set forth from time to time in Alexion's filings with the Securities and Exchange Commission, including but not limited to the risks discussed in Alexion's Quarterly Report on Form 10-Q for the period ended March 31, 2007 and in our other filings with the Securities and Exchange Commission. Alexion does not intend to update any of these forward-looking statements to reflect events or circumstances after the date hereof, except when a duty arises under law.

1 Hillmen P. The Terminal Complement Inhibitor Eculizumab Reduces Thrombosis in Patients with Paroxysmal Nocturnal Hemoglobinuria (PNH). Study accepted for presentation at the 12th Congress of European Hematology, organized by The European Hematology Association (EHA), on Saturday, June 9 in Vienna, Austria.

2 Schrezenmeier H. Safety and Efficacy of the Terminal Complement Inhibitor Eculizumab in Patients with Paroxysmal Nocturnal Hemoglobinuria (PNH): SHEPHERD Phase III Clinical Study Results. Study accepted for presentation at the 12th Congress of European Hematology, organized by The European Hematology Association (EHA), on Saturday, June 9 in Vienna, Austria.

3 Muus P. The Clinical Benefit of Eculizumab is Demonstrable in All Subpopulations of Patients with Paroxysmal Nocturnal Hemoglobinuira PNH with Hemolysis. Study accepted for oral presentation at the 12th Congress of European Hematology, organized by The European Hem
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