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CSL Behring Study in Animal Models Shows Feasibility of Developing a Half-Life Extended Recombinant FVIIa that Retains Biologic Activity
Date:12/10/2007

In data presented at the ASH 49th annual meeting recombinant factor VIIa-albumin fusion protein seen as first step toward more convenient

treatment option for hemophilia patients with inhibitors

ATLANTA, Dec. 10 /PRNewswire/ -- CSL Behring today announced the results of a pre-clinical study that show for the first time it is feasible to genetically fuse Factor VIIa (FVIIa) to human albumin, prolonging the half- life of this therapeutic protein while retaining its biologic activity. In the study, which was presented at the American Society of Hematology 49th Annual Meeting and Exposition, the half-life of recombinant VIIa-albumin fusion protein (rVIIa-FP) was shown to be extended 6-to-9 fold compared to wild type rFVIIa. Additionally, rVIIa-FP demonstrated a biologic activity comparable to wild type rFVIIa.

Recombinant factor VIIa (rFVIIa) may be used to control bleeding episodes in hemophilia patients with inhibitors. These patients develop an immune response that inhibits the substituted clotting factor from stopping a bleeding episode. However, rFVIIa has a short half-life of approximately 2.5 hours. This necessitates multiple injections, which are inconvenient for both physicians and patients, particularly during surgical intervention.

"A major unmet need in hematology is improving the pharmacokinetic parameters of coagulation factors, such as half-life, while retaining full hemostatic activity," said Dr. Stefan Schulte, Head Pre-clinical R&D, CSL Behring GmbH and lead investigator of the study. "The pharmacological properties of rVIIa-FP seen in our study could one day facilitate a single dosing regimen of one injection per bleeding event, as well as significantly reduce the number of injections hemophilia patients with inhibitors need during surgical interventions."

Recombinant VIIa-FP represents CSL Behring's initial corporate foray into research with recombinant coagulation product technology.

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