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ThromboGenics and BioInvent Have Dosed the First Patient in Phase IIb Trial of TB-402 (Anti-Factor VIII) for Venous Thromboembolism (VTE) Prophylaxis

Trial to assess the benefits of partial Factor VIII inhibition in total hip replacement surgery patients

27-04-2011: ThromboGenics NV and co-development partner BioInvent International announce that the first patient has been dosed in a Phase IIb trial with their novel long-acting anticoagulant TB-402 (Anti-Factor VIII) for the prophylaxis of venous thromboembolism (VTE) after total hip surgery.

The Phase IIb study is a multicenter, double blind, randomised controlled trial. It is comparing the safety and efficacy of two dose levels of TB-402, given as a single intravenous infusion after hip surgery, with the recently approved Factor Xa inhibitor rivaroxaban. The trial will enrol 600 patients across 41 centers in Europe. Results are expected in the second half of 2012.

TB-402 is a recombinant human monoclonal antibody that has a novel mode of action. It targets Factor VIII, a key component of the coagulation cascade. An important benefit of TB-402 is that a single injection could provide a stable, long-acting antithrombotic effect, for the prophylaxis of VTE after orthopaedic surgery, which is expected to lead to reduced nursing time and improved patient compliance.

Importantly, TB-402’s anti-coagulant activity is easily reversible using Factor VIII, in case of bleeding or need for surgery. In contrast, certain newer anticoagulant therapies lack an antidote which can make it difficult to manage serious bleeds or which may complicate or delay acute surgical procedures.

In 2010, TB-402 reported positive results in a 315-patient Phase IIa trial for VTE prophylaxis after knee replacement surgery, compared with enoxaparin, the standard treatment for preventing VTE in this setting. The positive pooled results of three doses of TB-402 (0.3 mg/kg, 0.6 mg/kg and 1.2 mg/kg) showed a 22% incidence of total VTE compared with 39% for enoxaparin (p<0.05). In addition, TB-402 was generally well tolerated and demonstrated comparable safety to enoxaparin. The results were published in the Journal of Thrombosis and Haemostasis in February 2011.

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