Key Points

  • Targeting 1-3% and 8-12% FVIII troughs was efficacious, with fewer bleeds in the 8-12% arm; safety profiles in both arms were similar.

  • Rurioctocog alfa pegol consumption varied widely in each arm with overlapping ranges, emphasizing the need for personalized treatment.

Rurioctocog alfa pegol prophylaxis targeting factor VIII (FVIII) troughs ≥1% is efficacious and well-tolerated in people with hemophilia A (PwHA). As some may benefit from higher FVIII troughs, the PROPEL trial compared safety and efficacy of 2 target FVIII trough levels in PwHA with severe disease, aged 12-65 years, annualized bleeding rate ≥2, and previous FVIII treatment. They were randomized to 12 months' pharmacokinetic (PK)-guided rurioctocog alfa pegol prophylaxis targeting FVIII troughs of 1-3% (reference arm) or 8-12% (elevated arm). Treatment-adjustment period was in the first 6 months. Primary endpoint: proportion of PwHA (full analysis set [FAS]) with zero total bleeds (all bleeds) during second 6 months. Overall, 115 male PwHA were randomized (N=115, FAS; N=95, per-protocol analysis set [PPAS]). In the 1-3% and 8-12% arms, respectively, point estimates (95% CI) of proportions of PwHA with zero total bleeds were 42% (29-55%) and 62% (49-75%) in FAS (P=0.055) and 40% (27-55%) and 67% (52-81%) in PPAS (P=0.015). Dosing frequency and consumption varied widely in each arm. Adverse events (AEs) occurred in 70/115 (60.9%) PwHA. Serious AEs occurred in 7/115 (6%) PwHA, including 1 treatment-related serious AE in 8-12% arm (transient anti-FVIII inhibitor). There were no deaths, serious thrombotic events, or AE-related discontinuations. PK-guided prophylaxis was achievable and efficacious in both arms, with no new safety signal in the 8-12% arm vs previous studies. These results demonstrate elevated FVIII troughs can increase the proportion of PwHA with zero bleeds and also emphasize the importance of personalized treatment. Trial registration: (#NCT02585960).

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