Efficacy and safety of prophylaxis with once-weekly BAY 79-4980 compared with thrice-weekly rFVIII-FS in haemophilia A patients: A randomised, active-controlled, double-blind study

Jerry S Powell, Uri Martinowitz, Jerzy Windyga, Giovanni Di Minno, Andrzej Hellmann, Ingrid Pabinger, Monika Maas Enriquez, Lawrence Schwartz, Jørgen Ingerslev

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22 Scopus citations


The benefits of prophylaxis of haemophilia A patients regarding joint health and quality-of-life are well established. However, adherence to an up to every-other-day infusion regimen is a barrier to widespread adoption of prophylaxis. BAY 79-4980 is an investigational drug consisting of rFVIII-FS (sucrose-formulated recombinant FVIII) reconstituted with liposome solvent. Previous clinical studies showed extended protection from bleeding after a single injection of BAY 79-4980 (13.3 ± 6.2 days) compared with rFVIII-FS (7.2 ± 1.7 days). The effect of once-a-week prophylaxis with BAY 79-4980 (35 IU/kg) compared with three times-per-week rFVIII-FS (25 IU/kg) in previously treated, severe haemophilia A patients was evaluated in a 52-week, double-blind, two-arm, randomised, controlled study. The primary and secondary endpoints were protection from total bleeds and joint bleeds, respectively. Short- and long-term safety and tolerability of BAY 79-4980 including effects on lipid levels were assessed. A total of 139 and 131 subjects were evaluable for safety and efficacy analyses, respectively. A large difference in efficacy between treatment groups was observed with 72.1% (49/68) in the rFVIII-FS control group demonstrating <9 bleeds/year compared with 38.1% (24/63) of BAY 79-4980-treated subjects. A similar difference was seen in annualised joint bleeds, with 43 subjects (63.2%) in the control group demonstrating <5 joint bleeds/year compared with 24 subjects (38.1%) treated with BAY 79-4980. The distribution of bleeds seven days post-prophylactic treatment with BAY 79-4980 showed that 61% of bleeds occurred after day 4 post dosing. There were no safety concerns identified. The investigational treatment arm was prematurely discontinued due to failure to achieve the primary endpoint.

Original languageEnglish (US)
Pages (from-to)913-922
Number of pages10
JournalThrombosis and Haemostasis
Issue number5
StatePublished - Sep 2012



  • Haemophilia
  • PEGylated liposome
  • Prophylaxis

ASJC Scopus subject areas

  • Hematology

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