Pharmacokinetics and pharmacodynamics of turoctocog alfa and N8-GP in haemophilia A dogs.

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Agerso H, Stennicke HR, Pelzer H, Olsen EN, Merricks EP, Defriess NA, Nichols TC, Ezban M

Pharmacokinetics and pharmacodynamics of turoctocog alfa and N8-GP in haemophilia A dogs.

Haemophilia. 2012 Nov;18(6):941-7. doi: 10.1111/j.1365-2516.2012.02896.x. Epub 2012 Jul 20.

PubMed ID
22812621 [ View in PubMed
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Abstract

The objective of the present study was to evaluate the pharmacokinetic (PK) and pharmacodynamic (PD) profiles of the new recombinant FVIII compound turoctocog alfa and a Glyco-PEGylated FVIII derivative thereof (N8-GP) in Haemophilia A dogs. Six haemophilic dogs divided into two groups were included in the study. Each dog was administered a dose of 125 U kg(-1) , blood samples were collected at predetermined time points for both pharmacokinetic (FVIII measured by one-stage aPTT assay) and pharmacodynamic [whole blood clotting time (WBCT)] evaluations. After intravenous administration to haemophilic dogs, the plasma concentration at the first sampling point was comparable for turoctocog alfa and N8-GP, and the clearance was estimated to be 6.5 and 3.9 mL h(-1) kg(-1) for turoctocog alfa and N8-GP respectively. Both turoctocog alfa and N8-GP were able to reduce the WBCT time to normal levels (<20 min), however, the reduced clearance was reflected in the WBCT, which returned to baseline at a later time point for N8-GP as compared with dogs dosed with turoctocog alfa. The clearance was 40% reduced for N8-GP as compared with turoctocog alfa. Simulations of a multiple dosing regimen in dogs, suggest that to maintain WBCT <20 min N8-GP can be dosed at reduced intervals, e.g. with 4 days between doses, whereas turoctocog alfa will have to be dosed with 2(1/2) day between doses. Data thereby supports N8-GP as an alternative to standard rFVIII replacement therapy, with a more convenient dosing regimen.

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