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From the University of Vermont, Burlington.
Address correspondence and reprint requests to Dr. Hillel Panitch, University of Vermont College of Medicine, FAHC-UHC Campus, 1 S. Prospect St., Burlington, VT 05401; e-mail: hillel.panitch{at}vtmednet.org
Objective: To evaluate the efficacy and safety of interferon beta-1b (IFNß-1b) in subjects with secondary progressive multiple sclerosis (SPMS).
Methods: This 3-year, multicenter, double-blind, placebo-controlled, randomized trial of IFNß-1b included 939 subjects from the United States and Canada with SPMS and Expanded Disability Status Scale (EDSS) scores ranging from 3.0 to 6.5. Subjects were randomly assigned to receive either placebo or IFNß-1b (250 µg or 160 µg/m2 body surface area), administered subcutaneously every other day. The primary outcome was time to progression by
1.0 EDSS point (0.5 point if EDSS score was 6.0 to 6.5 at entry) confirmed at 6 months. Secondary outcomes included mean change in EDSS score from baseline, relapse-related measures, MRI activity, and a standardized neuropsychological function test.
Results: There was no significant difference in time to confirmed progression of EDSS scores between placebo-treated patients and either of the IFNß-1b treatment groups. However, IFNß-1b treatment resulted in improvement on secondary outcome measures involving clinical relapses, newly active MRI lesions, and accumulated burden of disease on T2-weighted MRI. Effects were similar for both IFNß-1b treatment groups. Neutralizing antibodies to IFNß-1b were detected in 23% of 250-µg and 32% of 160-µg/m2 recipients, but their presence did not consistently affect clinical or MRI outcomes. IFNß-1b was also well tolerated at both doses.
Conclusions: Although no treatment benefit was seen on the time to confirmed progression of disability, relapse- and MRI-related outcomes showed significant benefit with both dosing regimens tested, a result consistent with the outcomes of earlier clinical trials.
Received December 11, 2003. Accepted in final form September 27, 2004.
Additional material related to this article can be found on the Neurology Web site. Go to www.neurology.org and scroll down the Table of Contents for the November 23 issue to find the link for this article.
*Members of the North American Study Group on Interferon beta-1b in Secondary Progressive MS are listed in the Appendix on page 1794.
Members of the writing committee and advisory board have received honoraria to lecture at conferences or participate at advisory meetings, but none of them holds any financial interest in the pharmaceutical company.
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