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Recombinant factor VIIa (Eptacog Alfa): a review of its use in congenital or acquired haemophilia and other congenital bleeding disorders.

Recombinant factor VIIa (NovoSeven) [also known as recombinant activated factor VII or eptacog alfa] is a vitamin K-dependent glycoprotein that is structurally similar to human plasma-derived factor VIIa. It is a recombinant product, manufactured using DNA biotechnology. Intravenous recombinant factor VIIa has been evaluated in the treatment of bleeding episodes and for providing haemostasis cover during surgery in patients with certain bleeding disorders. Large, well controlled trials of recombinant factor VIIa have not been performed because of the rarity of these bleeding disorders. However, the efficacy of recombinant factor VIIa has been investigated in these patients in double-blind dose-finding or noncomparative clinical trials and worldwide compassionate-use programmes. Recombinant factor VIIa is effective and generally well tolerated in patients with haemophilia A or B with inhibitors, those with acquired haemophilia or Glanzmann's thrombasthenia. Also, recombinant factor VIIa is a treatment of choice in patients with haemophilia B with high-responding inhibitors and those with factor VII deficiency. Direct head-to-head comparisons and robust pharmacoeconomic data are required to fully determine the position of recombinant factor VIIa in relation to other therapies. Importantly though, the product appears to be relatively free of antigenicity, thrombogenicity and risk of viral transmission that, in the past, have limited the utility of blood products. Given that these characteristics are important determinants of the place of a treatment in bleeding disorders, recombinant factor VIIa provides a valuable treatment alternative in patients with haemophilia with inhibitors, platelet-refractory Glanzmann's thrombasthenia or congenital factor VII deficiency.