Real-World Assessment of Pharmacokinetics, Clinical Outcomes, and Costs After Switching from Standard Half-Life to Extended Half-Life FVIII in Well-Controlled Hemophilia A Patients

<b>Objective:</b> This study aimed to analyze pharmacokinetic and clinical parameters (bleeding rates and joint health) before and after switching from standard half-life (SHL) factor VIII (FVIII) to extended half-life (EHL) PEGylated turoctocog alfa pegol in patients with severe/moderate hemophilia A (HA) on prophylaxis, one year prior to and following the switch in a real-world setting. <b>Methods:</b> A single-center, comparative, observational, sequential, retrospective, multidisciplinary study was designed. The population pharmacokinetic parameters were estimated using the WAPPS-Hemo^® platform. The annualized bleeding rate (including total and joint bleeds), joint health (Hemophilia Joint Health Score), FVIII consumption, administration frequency, and treatment costs were analyzed. <b>Results:</b> Eight patients with severe (n = 7) or moderate (n = 1) HA on prophylaxis were included after switching to turoctocog alfa pegol. With this regimen, the median FVIII half-life was 16.8 (15.2-19.1) hours, the area under the curve (AUC) was 18,182 (12,879-21,214) IU·h/dL, and the incremental recovery was 2.2 IU/dL per (1.6-2.4) IU/kg. The patients required a median of 2.0 infusions per week (2.0-2.0), corresponding to a weekly consumption of 57.8 (54.2-61.1) IU/kg. Clinically, the prophylactic regimen was associated with fewer infusions per week, stable joint health, and a reduction in overall treatment costs. <b>Conclusions:</b> Prophylaxis with turoctocog alfa pegol provided the expected pharmacokinetic profile of an EHL-FVIII concentrate, enabled a lower infusion frequency, and was linked to a decreased treatment burden and cost while maintaining joint health.