PK-guided personalized prophylaxis with Nuwiq® (human-cl rhFVIII) in adults with severe haemophilia A

Abstract

Introduction: Nuwiq^® (human-cl rhFVIII) is a 4^th generation recombinant human FVIII, without chemical modification or protein fusion, produced in a human cell-line.

Aims/methods: This study (NuPreviq) was a prospective, open-label, multicentre, phase IIIb study of the efficacy and safety of personalized prophylaxis with Nuwiq^® in 66 previously treated adults with severe haemophilia A. NuPreviq had three phases: (i) a 72-h pharmacokinetic (PK) phase; (ii) a 1-3 month standard prophylaxis phase; and (iii) a 6-month personalized prophylaxis phase. The personalized prophylaxis regimen was based on individual PK modelling for each patient according to whether their PK profile most closely fitted a two- or one-compartment model (NuPreviq approach). In cases of uncertainty, a noncompartment model was applied.

Results: The median dosing interval during personalized prophylaxis was 3.5 days, with 57% of patients on ≤2 weekly dosing. Mean annualized bleeding rates during personalized prophylaxis were 1.45 (median [interquartile range, IQR]: 0 [0, 1.9]) for all bleeds, 0.79 (median [IQR]: 0 [0, 0]) for spontaneous bleeds, and 0.91 (median [IQR]: 0 [0, 0]) for joint bleeds. During personalized prophylaxis, 83.1% of patients were spontaneous bleed-free. Compared with standard prophylaxis, median weekly prophylaxis dose was reduced by 7.2% from 100.0 to 92.8 IU kg^-1 during the last 2 months of personalized prophylaxis. There were no FVIII inhibitors or treatment-related serious or severe adverse events.

Conclusion: PK-guided personalized prophylaxis with Nuwiq^® provided bleeding protection and enabled the dosing interval to be extended to twice weekly or less in many patients and an overall dose reduction.

Keywords: Nuwiq®; haemophilia A; human-cl rhFVIII; personalized prophylaxis; pharmacokinetics; recombinant FVIII.