Intramuscular interferon beta-1a therapy in patients with relapsing-remitting multiple sclerosis: a 15-year follow-up study.
Disease-modifying drugs are initiated early and continued for years in patients with multiple sclerosis. Long-term tolerability and impact are not known. The objective of this study was to evaluate long-term tolerability of intramuscular interferon beta-1a and effects on disability and quality of life. Patients were evaluated an average of 15 years after randomization into a placebo-controlled, double-blind trial of intramuscular interferon beta-1a for relapsing multiple sclerosis. Patient-reported Expanded Disability Status Scale, the Short Form-36, a visual analog scale of self-care independence, and a living situation questionnaire were administered. Status was ascertained in 79% (136/172) of eligible patients. Analysis focused on 122 living patients. Despite open-label, non-standardized treatment after the 2-year clinical trial, 46% (n= 56) of the patients remained on intramuscular interferon beta-1a. Expanded Disability Status Scale scores were correlated highly with Short Form-36 subcategories and visual analog scale scores. Patients currently using intramuscular interferon beta-1a had a significantly lower mean Expanded Disability Status Scale score (p= 0.011), less progression to Expanded Disability Status Scale milestones, significantly better scores on the physical component of the Short Form-36 (p< 0.0001), and reported better general health and greater independence. We conclude that patients continuing to use intramuscular interferon beta-1a had less disability and better quality of life compared with patients not currently using intramuscular interferon beta-1a 15 years after randomization into a clinical trial.
Bermel
R A
RA
Department of Neurology, Mellen Center for Multiple Sclerosis Treatment and Research, Cleveland Clinic, Cleveland, OH 44195, USA. bermelr@ccf.org
Weinstock-Guttman
B
B
Bourdette
D
D
Foulds
P
P
You
X
X
Rudick
R A
RA
D000276:Adjuvants, Immunologic / Q000008:administration & dosage*; D000328:Adult; D000368:Aged; D004185:Disability Evaluation; D004311:Double-Blind Method; D005260:Female; D005500:Follow-Up Studies; D006801:Humans; D007273:Injections, Intramuscular; D000068556:Interferon beta-1a; D016899:Interferon-beta / Q000008:administration & dosage*; D008297:Male; D008875:Middle Aged; D020529:Multiple Sclerosis, Relapsing-Remitting / Q000188:drug therapy*; D011788:Quality of Life; D012720:Severity of Illness Index
D000276:Adjuvants, Immunologic; D016899:Interferon-beta; D000068556:Interferon beta-1a