Full results of the Evidence of Interferon Dose-Response-European North American Comparative Efficacy (EVIDENCE) study: A multicenter, randomized, assessor-blinded comparison of low-dose weekly versus high-dose, high-frequency interferon β-1a for relapsing multiple sclerosis
Department of Nuerology, University of Rochester, Rochester, New York 14642, USA. Clinical Therapeutics
(Impact Factor: 2.73).
09/2007; 29(9):2031-48. DOI: 10.1016/j.clinthera.2007.09.025
Interferon (IFN)-beta therapy represents an important advance in the management of relapsing multiple sclerosis (MS), but information about the relative benefits and risks of available preparations is limited.
This report describes the full results of the Evidence of Interferon Dose-response-European North American Comparative Efficacy (EVIDENCE) study, combining analyses that were previously reported in separate publications for different phases of the study.
The EVIDENCE study was a multicenter, randomized, assessor-blinded comparison of 2 IFN-beta dosing regimens. In the study, patients with relapsing MS were randomly assigned to SC IFN-beta1a 44 lag TIW (Rebif, Serono Inc., Geneva, Switzerland) or IM IFN-betala 30 mug QW (Avonex, Biogen Idec, Cambridge, Massachusetts) for 1 to 2 years. The primary clinical end point during the comparative phase was the proportion of patients who remained free from relapses; secondary and tertiary clinical end points included the annualized relapse rate and time to first relapse, re- spectively. All clinical and magnetic resonance imaging (MRI) evaluations were performed by blinded assessors. In the crossover phase of the study, patients who were originally randomized to low-dose QW treatment switched to the high-dose TIW treatment for an additional 8 months. Adverse events were determined by spontaneous reporting and monthly laboratory testing during the comparative phase.
A total of 677 patients were enrolled in the study and evenly randomized to treatment; 605 patients completed the comparative phase and 439 completed the crossover phase. During the comparative phase, a significantly higher proportion of patients in the high-dose TIW treatment group remained free from relapses when compared with patients in the low-dose QW treatment group (adjusted odds ratio, 1.5; 95% CI, 1.1-2.0; P = 0.023). The high-dose TIW regimen was also associated with a significant reduction in the annualized relapse rate (-17%; P = 0.033) and a prolonged time to first relapse (hazard ratio, 0.70; P = 0.002). MRI measures of disease activity were significantly reduced in the high-dose TIW group compared with the low-dose QW treatment. During the crossover phase, a 50% reduction in mean relapse rates was observed in patients who converted from low-dose QW treatment to high-dose TIW treatment (P < 0.001), with significant concomitant reductions in MRI activity. Injection-site reactions were significantly more common with high-dose TIW treatment than with low-dose QW treatment (85% vs 33%; P < 0.001). Neutralizing antibody formation was more common with high-dose TIW treatment than with low-dose QW treatment (26% vs 3%; P < 0.001).
The comparative phase of the EVIDENCE study found that treatment of MS with SC IFN-beta1a 44 microg TIW was associated with a significant reduction in clinical and imaging measures of disease activity over 1 to 2 years, when compared with IM IFN-betala 30 microg QW treatment. The crossover phase found that patients who changed from low-dose QW treatment to high-dose TIW treatment experienced enhanced benefits of treatment without a substantial increase in adverse events.
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- "Injected every other day (EOD) subcutaneously (SC), IFN beta-1b (Betaseron® in the USA, Betaferon® in Europe; Bayer) was joined in 1996 by IFN beta-1a (Avonex®; Biogen Idec), which requires intramuscular (IM) injection weekly. A second IFN beta-1a (Rebif®; Merck Serono), which is injected three times a week SC, gained approval in 2002, only after head-to-head comparison with Avonex in the Evidence of Interferon Dose–Response-European North American Comparative Efficacy (EVIDENCE; ClincalTrials.gov #NCT00292266) trial . Extavia® (Novartis), launched in 2009, uses the same biological ingredient (IFN beta-1b) and administration route as Betaseron. "
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ABSTRACT: Interferon (IFN) beta-1b was the first disease-modifying therapy to be approved for the treatment of multiple sclerosis (MS), and over 21 years of follow-up data demonstrate its efficacy and long-term safety profile. Following recent regulatory approvals in the USA and European Union, IFN beta-1b is now one of the seven disease-modifying therapies [intramuscular IFN beta-1a; subcutaneous (SC) IFN beta-1a; IFN beta-1b SC; glatiramer acetate SC; oral dimethyl fumarate; oral teriflunomide; and intravenous alemtuzumab] indicated for first-line use in relapsing–remitting MS. Here we review the clinical trial and follow-up data for IFN beta-1b and discuss factors that clinicians may consider when selecting this treatment, both at first line in early MS, and later in the disease course.
Electronic supplementary material
The online version of this article (doi:10.1007/s12325-014-0149-1) contains supplementary material, which is available to authorized users.
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- "According to results from clinical trials, IFN-β treatment reduces relapse rates by about 30%, decreases the formation of inflammatory lesions in the CNS and extends remission periods (Schwid and Panitch, 2007). However, a major problem is that a high proportion of about 20% of the patients do not or only poorly respond to IFN-β treatment. "
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