Abstract

CONTEXT
Interferon beta is widely prescribed to treat multiple sclerosis (MS); however, its relationship with disability progression has yet to be established.
OBJECTIVE
To investigate the association between interferon beta exposure and disability progression in patients with relapsing-remitting MS.
DESIGN, SETTING, AND PATIENTS
Retrospective cohort study based on prospectively collected data (1985-2008) from British Columbia, Canada. Patients with relapsing-remitting MS treated with interferon beta (n = 868) were compared with untreated contemporary (n = 829) and historical (n = 959) cohorts.
MAIN OUTCOME MEASURES
The main outcome measure was time from interferon beta treatment eligibility (baseline) to a confirmed and sustained score of 6 (requiring a cane to walk 100 m; confirmed at >150 days with no measurable improvement) on the Expanded Disability Status Scale (EDSS) (range, 0-10, with higher scores indicating higher disability). A multivariable Cox regression model with interferon beta treatment included as a time-varying covariate was used to assess the hazard of disease progression associated with interferon beta treatment. Analyses also included propensity score adjustment to address confounding by indication.
RESULTS
The median active follow-up times (first to last EDSS measurement) were as follows: for the interferon beta-treated cohort, 5.1 years (interquartile range [IQR], 3.0-7.0 years); for the contemporary control cohort, 4.0 years (IQR, 2.1-6.4 years); and for the historical control cohort, 10.8 years (IQR, 6.3-14.7 years). The observed outcome rates for reaching a sustained EDSS score of 6 were 10.8%, 5.3%, and 23.1% in the 3 cohorts, respectively. After adjustment for potential baseline confounders (sex, age, disease duration, and EDSS score), exposure to interferon beta was not associated with a statistically significant difference in the hazard of reaching an EDSS score of 6 when either the contemporary control cohort (hazard ratio, 1.30; 95% CI, 0.92-1.83; P = .14) or the historical control cohort (hazard ratio, 0.77; 95% CI, 0.58-1.02; P = .07) were considered. Further adjustment for comorbidities and socioeconomic status, where possible, did not change interpretations, and propensity score adjustment did not substantially change the results.
CONCLUSION
Among patients with relapsing-remitting MS, administration of interferon beta was not associated with a reduction in progression of disability.

Links

Publisher Full Text

Authors

Shirani A, Zhao Y, Karim ME, Evans C, Kingwell E, van der Kop ML, Oger J, Gustafson P, Petkau J, Tremlett H

Institution

Division of Neurology and Brain Research Centre, Department of Medicine and Vancouver Coastal Health Research Institute, University of British Columbia, Vancouver, Canada.

Source

JAMA : the journal of the American Medical Association 308:3 2012 Jul 18 pg 247-56

MeSH

Adult
British Columbia
Cohort Studies
Disabled Persons
Disease Progression
Female
Humans
Immunologic Factors
Interferon-beta
Male
Middle Aged
Multiple Sclerosis, Relapsing-Remitting
Retrospective Studies
Young Adult

Pub Type(s)

Journal Article
Research Support, Non-U.S. Gov't

Language

eng

PubMed ID

22797642