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- W4283169543 abstract "Neutralizing factor VIII (FVIII) antibodies are a major complication in hemophilia A. Antihemophilic factor VIII (recombinant), porcine sequence (rpFVIII; susoctocog alfa; Baxalta US Inc., a Takeda company) has low cross-reactivity to anti-human FVIII antibodies and can provide functional FVIII activity in the presence of FVIII inhibitors.Evaluate in vitro thrombin generation and clot formation responses to rpFVIII in blood from patients with congenital hemophilia A.In this multicenter study, blood was obtained for in vitro analyses that included human and porcine FVIII inhibitors, low <5 Bethesda units (BU)/ml or high ≥5 BU/ml titer (Nijmegen-modified Bethesda assay); thrombin generation assay (TGA), clot viscoelasticity (thromboelastography), fibrin clot structure analysis (scanning electron microscopy), and epitope mapping.Blood samples were from 20 patients with congenital hemophilia A (FVIII activity <1%, mean [range] inhibitor titers: anti-human FVIII, 14 [1-427] BU/ml [n = 13 high, n = 6 low, n = 1 data unavailable]); anti-porcine FVIII, 12 (0-886) BU/ml (n = 11 high, n = 8 low, n = 1 data unavailable). Porcine inhibitor titer and TGA response measured by endogenous thrombin potential showed an inverse correlation (2.7-10.8 U/ml rpFVIII Spearman correlation coefficient: -0.594 to -0.773; p < 0.01). Clot structures in low anti-porcine inhibitor titer plasmas were similar to those in noninhibitor plasma.Recombinant porcine factor VIII demonstrated a dose-dependent correction of thrombin generation and clot formation in vitro, dependent on the anti-porcine FVIII inhibitor titer. Procoagulant responses to rpFVIII occurred in plasma containing FVIII inhibitors." @default.
- W4283169543 created "2022-06-21" @default.
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- W4283169543 date "2022-04-01" @default.
- W4283169543 modified "2023-09-30" @default.
- W4283169543 title "Recombinant porcine factor VIII corrects thrombin generation in vitro in plasma from patients with congenital hemophilia A and inhibitors" @default.
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- W4283169543 doi "https://doi.org/10.1002/rth2.12731" @default.
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