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• W1982025963 abstract "ReFacto (moroctocog alfa), a recombinant factor VIII approved for the treatment of haemophilia A, is produced by a mammalian cell-culture process that includes therapeutic-grade human serum albumin (HSA) in the cell-culture medium. While to date there have been no cases of transmissible spongiform encephalopathy (TSE) resulting from the clinical use of HSA, Wyeth conducted a study to demonstrate that the ReFacto manufacturing process has significant capacity to remove a TSE agent if it were present as a contaminant in the HSA. The immunoaffinity (8A4 Sepharose) and anion-exchange (Q Sepharose) chromatography steps were evaluated for the clearance of the hamster TSE agent, strain 263K. This Good Laboratory Practice study was performed using appropriately qualified, laboratory-scale chromatography systems. Filtered brain homogenate from TSE-infected hamsters was added to loads of both chromatographic columns, and the concentration of TSE agent in the loads and product pools were determined using a validated western blot quantitation method. Replicate chromatography runs were consistent, as demonstrated by the < or =0.7 log(10) difference observed in TSE agent reduction between each pair of runs. The immunoaffinity and anion-exchanges steps demonstrated 3.8 log reduction and >5.2 log reduction respectively. These data provide a high degree of assurance that in the unlikely event of a TSE contamination of the HSA used in the ReFacto cell-culture process, the purification steps have the potential to remove the infectious agent to extremely low levels, thereby significantly reducing the risk to patients receiving ReFacto." @default.
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• W1982025963 date "2007-09-01" @default.
• W1982025963 modified "2023-09-23" @default.
• W1982025963 title "Transmissible spongiform encephalopathy agent clearance by the immunoaffinity and anion-exchange chromatography steps of the ReFacto^�manufacturing process" @default.
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• W1982025963 doi "https://doi.org/10.1111/j.1365-2516.2007.01441.x" @default.
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