The Pharmacokinetics and Pharmacodynamics of A Novel Recombinant Activated Human Factor VII, GEN-0828, in Hemophilia B Mice

GEN-0828, a proposed clinical candidate for hemophilia and trauma hemorrhage treatment, is a novel recombinant activated human factor VII (rFVIIa). The purpose of this paper is to compare the pharmacokinetics and pharmacodynamics of GEN-0828 in hemophilia B mice with those of NovoSeven®, the only marketed rFVIIa product worldwide., GEN-0828 and NovoSeven® showed similar affinity bioactivity to recombinant tissue factor (rTF) in vitro. Pharmacodynamics data indicated a generally similar hemostatic efficacy (ED50) of GEN-0828 (10.91 KIU·kg-1) and NovoSeven® (18.91 KIU·kg-1) at the doses studied in hemophilia B mice, while GEN-0828 represented a lower initial effective dosage compared with that of NovoSeven® in terms of both blood loss and APTT. GEN-0828 exhibited linear pharmacokinetic profiles in hemophilia B mice at the 30-338 KIU·kg-1 dose range, the comparative pharmacokinetic study with NovoSeven® indicated better characteristics than NovoSeven® in terms of the appropriate higher maximal concentration (Cmax) and area under the plasma concentration-time curve (AUClast) and longer mean residence time (MRT). In conclusion, GEN-0828 was a promising new type of rFVIIa compound with favourable pharmacokinetic and pharmacodynamic profiles.