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Pharmacokinetics of Optivate®, a high-purity concentrate of factor VIII with von Willebrand factor, in patients with severe haemophilia A


Dr Clive H Dash, Bio Products Laboratory, Dagger Lane, Elstree, Herts WD6 3 BX, UK.
Tel.: +44 20 8957 2565; fax: +44 20 8957 2611;


Summary.  Optivate® is a high purity factor VIII/von Willebrand factor (FVIII/VWF) concentrate, which is manufactured using two antiviral processes: solvent/detergent and terminal dry heating (80°C for 72 h). A multicentre, non-randomized open-label study in 15 patients was conducted to test the pharmacokinetics (PK) of Optivate®. PK variables were analysed for the patients’ prior FVIII product (PK1), their first dose of Optivate® (PK2) and at 3 months therapy (PK3). Mean non-compartmental half-lives (h) were 14.1, 12.4 and 12.1, respectively (P = 0.45), mean clearances (mL h−1 kg−1) were 3.6, 3.2 and 3.1, respectively (P = 0.051), MRTs (h) were 19.0, 17.3 and 17.4, respectively (P = 0.39) and mean AUC0–48h (h IU mL−1) were 14.3, 15.4 and 16.6, respectively (P = 0.051) and mean AUC0–∞ (h IU mL−1) were 15.9, 16.4 and 17.9, respectively (P = 0.18). The recovery data from this PK study was aggregated with recovery data collected from another study, with similar design but devoid of the other PK measurements. A total of 309 recoveries were conducted in 70 patients. The overall mean recovery per subject across 27 Optivate® batches was 2.7 IU dL−1 per IU kg−1. There were no clinical differences between Optivate® and other FVIII products, and except for volume of distribution (Vd), no statistically significant differences were seen with respect to any of the other PK variables, or in recovery between weeks 0 and 12. Therefore, the PK of FVIII is not affected by the processes used to manufacture Optivate®, which can be expected to be effective in the management of patients with haemophilia A.