First Report On The Safety And Efficacy Of A Long-Acting Recombinant Fviii (Turoctocog Alfa Pegol, N8-Gp) During Major Surgery In Patients With Severe Hemophilia A

Introduction N8-GP (turoctocog alfa pegol) is an extended half-life, recombinant factor VIII (FVIII) that has a site-specific glycoPEGylation in the truncated B-domain. Upon activation, the glycopegylated domain is cleaved from N8-GP yielding FVIIIa, which is identical to endogenous FVIIIa. Pathfinder TM 2 and pathfinder™3 (www.ClinicalTrials.gov identifiers: NCT01480180 and NCT01489111, respectively) are ongoing international, open-label, non-randomized, phase 3 clinical trials of N8-GP in patients aged ≥12 years with severe hemophilia A and with a documented history of at least 150 exposure days to other FVIII products, in line with regulatory guidelines. All patients in the pivotal pathfinder TM 2 trial are offered entry into pathfinder TM 3 if major surgery is required, thus enabling patients to undergo surgery without having to switch to another FVIII product. After completion of pathfinder TM 3, patients returned to the prophylactic or on-demand treatment arm in pathfinder TM 2 as per their prior participation in the trial. We report a planned main phase interim analysis of the single-arm pathfinder TM 3 trial evaluating the efficacy and safety of N8-GP during surgical procedures in patients with severe hemophilia A. Methods Patients recruited into the pathfinder TM 3 trial were males aged ≥12 years (aged ≥18 years in France and the Netherlands) with severe hemophilia A (FVIII activity level Results The main phase interim analysis includes results from 16 patients (median age of 36.5 years; range: 15−66 years) who underwent 18 major surgical procedures (including synovectomy, joint replacement, ankle arthrodesis, and psoas pseudo tumor excision). All surgeries were effectively performed with N8-GP. Hemostasis was successful (i.e., rated as 9excellent9 or 9good9) on completion of surgery in 17 (94.4%) procedures, and no change of treatment regimen was needed in any patient. For one procedure (complicated total hip replacement) the hemostatic response was rated 9moderate9 (5.6%) in a patient with multiple comorbidities and low platelet count at day of surgery. The postsurgical hemostatic effect success rate with N8-GP was 100%. N8-GP was well tolerated and no safety issues were identified during this trial; no FVIII inhibitors were detected, and no thromboembolic events occurred. Conclusions As the first report for a longer-acting glycoPEGylated FVIII product, the results from pathfinder™ 3 indicate that N8-GP is effective and well tolerated with a favorable safety profile for perioperative management of major surgical procedures in patients with severe hemophilia A. Disclosures Hampton: Novo Nordisk: Honoraria. Chowdary: CSL Behring: Consultancy, Research Funding; Bayer: Consultancy; SOBI: Consultancy; Biogen Idec: Consultancy; Baxter: Consultancy; Novo Nordisk: Consultancy, Research Funding; Pfizer: Consultancy, Research Funding. Dunkley: Baxter: Consultancy; Novo Nordisk: Honoraria; Bayer: Honoraria; Pfizer: Honoraria. Ehrenforth: Novo Nordisk: Employment. Jacobsen: Novo Nordisk: Employment. Neff: Alexion: Speakers Bureau; Baxter: Speakers Bureau; Novo Nordisk: Research Funding, Speakers Bureau. Santagostino: Bayer: Speakers Bureau; Octapharma: Speakers Bureau; Roche: Speakers Bureau; Biogen/Sobi: Speakers Bureau; Baxter/Baxalta: Speakers Bureau; Pfizer: Research Funding, Speakers Bureau; Biotest: Speakers Bureau; Novo Nordisk: Speakers Bureau; CSL Behring: Speakers Bureau; Kedrion: Speakers Bureau. Takedani: Novo Nordisk: Speakers Bureau; Baxter: Speakers Bureau; Bayer: Speakers Bureau; Kaketsuken: Speakers Bureau; Pfizer: Speakers Bureau. Takemoto: Novo Nordisk: Research Funding; Mast Therapeutics: Speakers Bureau. Negrier: Biogen/Sobi: Consultancy; Novo Nordisk: Consultancy, Research Funding; Pfizer: Consultancy, Research Funding; LFB: Consultancy; Bayer: Consultancy, Research Funding; Baxter: Consultancy, Research Funding; CSL Behring: Consultancy, Research Funding.