Recombinant Fusion Protein Linking Coagulation Factor IX With Albumin (rIX-FP) in Chinese Subjects With Hemophilia B Previously Treated With FIX Therapy

This study will investigate the pharmacokinetics (PK), efficacy, and safety of rIX-FP for the routine prophylaxis of bleeding episodes in male Chinese previously treated patients (PTPs) with hemophilia B (FIX activity of ≤ 2%). In addition to the scheduled rIX-FP prophylaxis regimen, subjects may also receive rIX-FP episodic (on-demand) treatment for breakthrough bleeding episodes and rIX-FP for the prophylaxis and treatment of bleeding in emergency surgical procedures.

Inclusion Criteria: * Male Chinese subjects aged ≤ 70 years * Subjects with documented severe or moderately severe hemophilia B (FIX activity of ≤ 2%) * Subjects have received FIX products for ≥ 150 exposure days (EDs) (subjects aged ≥ 6 years) or ≥ 50 EDs (subjects aged \< 6 years) * Subjects have no confirmed prior history of FIX inhibitor formation Exclusion Criteria: * Known hypersensitivity (allergic reaction or anaphylaxis) to any FIX product or hamster protein. * Known congenital or acquired coagulation disorder other than congenital FIX deficiency. * Currently receiving intravenous (IV) immunomodulating agents such as immunoglobulin or chronic systemic corticosteroid treatment. * Currently receiving a long-acting recombinant FIX treatment such as coagulation factor IX (recombinant), Fc fusion protein (Alprolix®). * Use of traditional or herbal Chinese medicine(s) with an impact on hemophilia, including coagulation, within 28 days before Day 1 and / or refusal to abstain from these during the study until the end of the subject's participation in the study.