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ThromboGenics And BioInvent Announce Results From Phase IIb Venous Thromboembolism Prevention Study With TB-402

LEUVEN, Belgium and LUND, Sweden, June 5, 2012 /PRNewswire/ --

- All further development of TB-402 will be stopped

ThromboGenics NV (Euronext Brussels: THR) and co-development partner BioInvent International (OMXS: BINV) announce today the results from a Phase IIb trial comparing TB-402, a long acting anticoagulant, against rivaroxaban (Xarelto®; Bayer), an oral anticoagulant.  The study showed that the incidence of venous thromboembolism (VTE) was similar with both drugs, but patients receiving TB-402 had a significantly higher incidence of bleeding events. Based on these results, ThromboGenics and BioInvent have decided to stop further development of TB-402.

The Phase IIb trial was a multicenter, randomised, double blind trial, evaluating single doses of either 25 or 50 mg TB-402 against rivaroxaban in patients undergoing hip replacement surgery. Rivaroxaban is a recently approved oral factor Xa inhibitor for the prevention of VTE after elective hip or knee replacement surgery.

TB-402 was administered as a single intravenous infusion two to four hours post-operatively, and rivaroxaban was administered as 10 mg once daily for 35 days. A total of 632 patients were enrolled between April and December 2011 in 36 centers across nine countries.

The primary efficacy outcome of the study was the incidence of total VTE up to 35 days post operatively. VTE consisted of both asymptomatic deep vein thrombosis (DVT), as detected by bilateral venography, and symptomatic VTE, i.e. DVT or pulmonary embolism (PE). The principle safety outcome was major bleeding or clinically relevant non-major bleeding events up to 35 days after surgery.

The study showed that the incidence of VTE was similar for TB-402 and rivaroxaban. In the pooled TB-402 group, 5.3% of patients had VTE, compared with 4.7% in the group treated with rivaroxaban. All incidences were asymptomatic DVT.  However, major or clinically relevant non-major bleeding occurred in 6.5% of the patients treated with TB-402 compared to 1.4% of patients treated with rivaroxaban, a statistically significant difference.

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