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• W1966221405 endingPage "2060" @default.
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• W1966221405 abstract "Three different recombinant interferon beta (IFNbeta) preparations are currently available for the treatment of MS, two IFNbeta-1a products (Rebif and Avonex) and one IFNbeta-1b product (Betaferon). These products differ with respect to the recommended dose, the dosage regimen, and the injection route. This study compared the relative biologic activity of these three products in vitro and in vivo.Blood samples were collected from 237 patients with MS (170 on IFNbeta therapy and 67 control subjects receiving no therapy). Samples with neutralizing antibodies were excluded. Levels of the antiviral protein MxA and soluble vascular cell adhesion molecule-1 (sVCAM) in the four groups were measured by ELISA. In the in vitro investigation, untreated blood was incubated for 24 hours with increasing concentrations of the three IFNs from a dose of 1 IU/mL to 1000 IU/mL, after which levels of MxA were measured.A difference between the groups was observed in vitro, with a significant change from baseline in MxA levels being observed at 10 IU for Betaferon compared with 100 IU for Rebif and Avonex. However, this might be due to the different methods used for the determination of IU by the manufacturers. At the single-dose level there were no significant differences between IFNbeta preparations. In vivo, there were significantly different levels of MxA in the four groups. In the Betaferon group, the median value for MxA was 2.29 ng/105 peripheral blood leukocytes (PBL), compared with 1.00 ng/105 PBL for Rebif, 0.57 ng/105 PBL for Avonex, and 0.14 ng/105 PBL for the control group. Some significant differences between the groups were also apparent with respect to levels of sVCAM, which were higher with Betaferon than with Rebif.IFNbeta-1b induces higher levels of the above markers of IFNbeta bioactivity than either of the two IFNbeta-1a preparations. Moreover, there is a less striking difference between the two IFNbeta-1a preparations in favor of subcutaneous IFNbeta-1a." @default.
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• W1966221405 date "2000-06-13" @default.
• W1966221405 modified "2023-10-16" @default.
• W1966221405 title "A comparative study of the relative bioavailability of different interferon beta preparations" @default.
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• W1966221405 doi "https://doi.org/10.1212/wnl.54.11.2055" @default.
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