Posted on January 16, 2013 by
Arch Neurol. 2012 Feb;69(2):183-90. doi: 10.1001/archneurol.2011.1426. Epub 2011 Oct 10.
Association between immediate initiation of intramuscular interferon beta-1a at the time of a clinically isolated syndrome and long-term outcomes: a 10-year follow-up of the Controlled High-Risk Avonex Multiple Sclerosis Prevention Study in Ongoing Neurological Surveillance.
Kinkel RP, Dontchev M, Kollman C, Skaramagas TT, O’Connor PW, Simon JH; Controlled High-Risk Avonex Multiple Sclerosis Prevention Study in Ongoing Neurological Surveillance Investigators.
Multiple Sclerosis Center, Beth Israel Deaconess Medical Center, Harvard Medical School, 330 Brookline Ave, KS 211, Boston, MA 02215, USA. email@example.com
To determine whether immediate initiation of treatment at the time of a clinically isolated syndrome in patients at high risk for clinically definite multiple sclerosis alters disease course over 10 years.
Prospective follow-up study.
Twenty-four Controlled High-Risk Subjects Avonex Multiple Sclerosis Prevention Study (CHAMPS) sites in the United States and Canada.
A total of 81 patients originally randomly assigned to receive intramuscular interferon beta-1a (the immediate-treatment group) and 74 patients originally randomly assigned to receive placebo (the delayed-treatment group). All patients were from CHAMPS.
For the immediate-treatment group, treatment was initiated within a month after the onset of a clinically isolated syndrome, and for the delayed-treatment group, treatment was initiated a median of 30 months (interquartile range, 24-35 months) after CHAMPS randomization.
MAIN OUTCOME MEASURES:
Rate of developing clinically definite multiple sclerosis, annualized relapse rate, disease course classification, disability measures, and magnetic resonance imaging measures.
The immediate-treatment group showed a lower 10-year rate of clinically definite multiple sclerosis (unadjusted hazard ratio, 0.64 [95% CI, 0.48-0.87]; P = .004) and a lower annualized relapse rate between years 5 and 10 (P = .03). There was no differential effect on disability, magnetic resonance imaging T2-weighted lesions, or the proportion of patients developing progressive disease at 10 years. Few patients reached the Expanded Disability Status Scale milestone scores of 4.0 or greater (9% of patients) or 6.0 or greater (6% of patients).
Immediate initiation of intramuscular interferon beta-1a at the time of a clinically isolated syndrome in high-risk patients reduces relapse rates over 10 years but does not improve disability outcomes compared with a control group that also initiated therapy relatively early in the disease course.
clinicaltrials.gov Identifier: NCT00179478.
[PubMed – indexed for MEDLINE]