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Population pharmacokinetics of recombinant factor VIII Fc fusion protein
Author(s) -
Nestorov Ivan,
Neelakantan Srividya,
Ludden Thomas M,
Li Shuanglian,
Jiang Haiyan,
Rogge Mark
Publication year - 2014
Publication title -
clinical pharmacology in drug development
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.711
H-Index - 22
eISSN - 2160-7648
pISSN - 2160-763X
DOI - 10.1002/cpdd.167
Subject(s) - dosing , pharmacokinetics , population , covariate , volume of distribution , medicine , von willebrand factor , recombinant dna , pharmacology , chemistry , statistics , mathematics , biochemistry , environmental health , platelet , gene
Population pharmacokinetics (PK) of FVIII activity‐time profiles following recombinant factor VIII Fc fusion protein (rFVIIIFc) and recombinant factor VIII (rFVIII) dosing were evaluated in previously treated patients with severe hemophilia A (from two clinical trials). Potential covariates that may be determinants of variability in FVIII activity were identified. A 2‐compartment model adequately described the PK of both compounds. von Willebrand Factor (VWF) concentration was the major covariate for rFVIIIFc clearance, reflecting its protective role in FVIII activity clearance. The effect of body weight and hematocrit on the central volume of distribution of rFVIIIFc was minor. The results of these analyses confirmed that rFVIIIFc clearance (1.65 dL/h) is much lower than that of rFVIII (2.53 dL/h), while the steady state volumes of distribution were similar. The strong positive correlations between the PK parameters of rFVIIIFc and rFVIII suggest that individuals who have high time‐related PK characteristics with rFVIII are likely to have comparable characteristics with rFVIIIFc. Steady‐state activity‐time profiles for selected rFVIIIFc dosing regimens were simulated accounting for uncertainty in model parameters. These population PK analyses and simulations provide a comprehensive characterization of the PK of rFVIIIFc and rFVIII and may be useful for designing dosing regimens.