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Background: Therapeutics in end-stage renal disease (ESRD) patients undergoing haemodialysis (HD) has to consider potential drug clearance during the dialysis procedure. Pegylated interferon-[alpha] (PEG-IFN-[alpha]), a middle-size protein drug active against viral hepatitis, allows convenient once-weekly dosing due to prolonged plasma half-life.

Aim: To investigate the impact of permeability and dialyser pore size on PEG-IFN-[alpha] blood levels during experimental HD.

Methods: Polymethylmetacrylate (PMMA) membrane 1.6 m2 dialysers with three different permeabilities/pore sizes were selected.

Results: A 40 kDa PEG-IFN-[alpha]2a (PEGASYS) was not cleared (< 5%) through low-flux/small pore size (25 A;B3A) and high-flux/middle-large pore size (60 A;BKP) dialysers, and was partially ([almost equal to]15%) through intermediate permeability/large pore size (100 A;BKF) dialysers. In contrast, unmodified 17 kDa IFN-[alpha]2a(Roferon-A) was removed (65%-95%) through BKP or BKF, but not B3A, PMMA dialysers. Moreover, 12 kDaPEG-IFN-[alpha]2b(PegIntron) was cleared (40%-80%) through PMMA dialysers with pore sizes >= 60 A. When B3A or BKP were replaced every hour PEG-IFN-[alpha]2a plasma levels remained constant throughout three experimental-HD-sessions, but PEG-IFN-[alpha]2b was cleared partially every BKP replacement. Porosity differ among high-flux dialysers. Neither PEG-IFN-[alpha]2a nor PEG-IFN-[alpha]2b were removed after three HD sessions through (27/31/33 A) pore size polysulphone dialysers. Although PEG-IFN-[alpha]2a was not cleared through middle pore-size (43 A/AN69ST) polyacrylonitrile dialyser, PEG-IFN-[alpha]2b was partially removed.

Conclusions: The pharmacokinetics of Peg-IFN-[alpha] may vary in a patient on dialysis.

Copyright (C) 2004 Blackwell Publishing Ltd.