The pharmacokinetic diversity of two von Willebrand factor (VWF)/ factor VIII (FVIII) concentrates in subjects with congenital von Willebrand disease

Craig M. Kessler; Friedman Ken; Bruce A. Schwartz; Joan C. Gill; Jerry S. Powell; for the Wilate® PK Study Investigators

doi:10.1160/TH11-02-0057

Thrombosis and Haemostasis, Table of Contents

Thromb Haemost 2011; 106(02): 279-288
DOI: 10.1160/TH11-02-0057

Blood Coagulation, Fibrinolysis and Cellular Haemostasis

Schattauer GmbH

The pharmacokinetic diversity of two von Willebrand factor (VWF)/ factor VIII (FVIII) concentrates in subjects with congenital von Willebrand disease

Results from a prospective, randomised crossover study

Authors

Craig M. Kessler

¹Hemophilia and Thrombophilia Comprehensive Treatment Center, Lombardi Comprehensive Cancer Center, Georgetown University Medical Center, Washington, USA
Friedman Ken

²Comprehensive Center for Bleeding Disorders, Blood Center of Wisconsin and Medical College of Wisconsin, Milwaukee, Wisconsin, USA
Bruce A. Schwartz

³Octapharma USA Inc., Hoboken, New Jersey, USA
Joan C. Gill

²Comprehensive Center for Bleeding Disorders, Blood Center of Wisconsin and Medical College of Wisconsin, Milwaukee, Wisconsin, USA
Jerry S. Powell

⁴Hemophilia Treatment Center, University of California, Davis, Sacramento, California, USA

for the Wilate^® PK Study Investigators

Abstract

Summary

The pharmacokinetic (PK) profiles of von Willebrand factor (VWF) /factor VIII (FVIII) concentrates are important for treatment efficacy and safety of von Willebrand disease (VWD) patients. This prospective, head-to-head, randomised crossover study compared the PK profile of a new, high purity, human plasma-derived (pd)VWF/FVIII concentrate, Wilate^®, with the PK profile of an intermediate purity (pd)VWF/FVIII concentrate, Humate-P^¯, in VWD patients. Subjects with inherited VWD were randomised to a single intravenous dose (40 IU/kg VWF ristocetin cofactor activity [VWF:RCo]) of Wilate^® or Humate-P^¯ in Period 1, and switched to the other study drug in Period 2. Each period was preceded by a washout time of ≥7 days. Coagulation factor parameters were analysed at multiple time-points. Of 22 randomised subjects, 20 had evaluable PK profiles, which indicated comparability for VWF antigen and VWF:RCo between Wilate^® and Humate-P^¯. The reported VWF:RCo average and terminal t1/2 of 10.4 and 15.8 hours (h), respectively, for Wilate^® and 9.3 h and 12.8 h for Humate-P^®, were not statistically different. Also, the mean VWF:RCo in vivo recoveries (Wilate^® 1.89, Humate-P^® 1.99 IU/dl per IU/kg) were similar between the two replacement therapies. Wilate^® showed parallel decay curves for VWF:RCo and FVIII clotting activity (FVIII:C) over time, while FVIII:C of Humate-P^® displayed a plateau between 0 and 12–24 h. This study demonstrated bioequivalent PK properties for VWF between Wilate^® and Humate-P^®. The PK profile of Wilate^®, combined with the 1:1 VWF/FVIII ratio, theoretically should facilitate dosing and laboratory monitoring of VWF replacement to prevent bleeding in individuals with VWD.

keywords

Factor VIII/von Willebrand factor concentrate - Humate-P^® - pharmacokinetics - ristocetin co-factor - Wilate^®

Full Text

References

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