Title: Subgroups of the BENEFIT study: risk of developing MS and treatment effect of interferon beta-1b
Authors: Polman, Chris H ×
Kappos, Ludwig
Freedman, Mark S
Edan, Gilles
Hartung, Hans-Peter
Miller, David H
Montalban, Xavier
Barkhof, Frederik
Selmaj, Krzysztof
Uitdehaag, Bernard M. J
Dahms, Susanne
Bauer, Lars
Pohl, Christoph
Sandbrink, Rupert
Dubois, Bénédicte
BENEFIT Investigators #
Issue Date: Apr-2008
Publisher: Springer-Verlag
Series Title: Journal of neurology vol:255 pages:480-487
Abstract: BACKGROUND : The BENEFIT study examined interferon beta (IFNB)-1b treatment in patients with clinically isolated syndrome (CIS) and > or = 2 clinically silent brain MRI lesions. METHODS : Subgroups of 468 patients (IFNB-1b: n = 292; placebo: n = 176) were created for demographics, clinical, laboratory, and MRI findings at onset. The 'natural' risk of clinically definite MS (CDMS) over 2 years was estimated by Kaplan Meier statistics in placebo-treated patients; the IFNB-1b treatment effect was analysed by Cox proportional hazards regression. RESULTS : The risk of CDMS was increased in placebo-treated patients (overall 45 %) if they were younger (< 30 years: 60%), were cerebrospinal fluid (CSF)-positive (49 %), or had received steroid treatment (48 %). MRI parameters implied a higher risk in placebo-treated patients with > or = 9 T2-lesions (48%) or > or = 1 gadolinium (Gd)-enhancing lesions (52 %). The CDMS risk was highest (75 %) in placebo-treated patients with monofocal disease onset displaying MRI disease activity (> or = 1 Gd-lesion) and dissemination (> or = 9 T2-lesions). Treatment effects were significant across almost all subgroups including patients with less disease dissemination/activity at onset (monofocal: 55%; < 9 T2-lesions: 60%; no Gd-lesions: 57%) and patients without steroid treatment for the CIS (62 %). Monofocal patients had greater treatment effects if they had > or = 9 T2-lesions (61 %), Gd-lesions (58 %), or both (65 %). CONCLUSIONS : This study confirms the impact of age of onset, CSF and MRI findings on risk of conversion from CIS to CDMS. IFNB-1b treatment effect was robust across the study population including patients without MRI disease activity and less clinical or MRI disease dissemination at onset and patients not receiving steroids for the CIS.
ISSN: 0340-5354
Publication status: published
KU Leuven publication type: IT
Appears in Collections:Research Group Experimental Neurology
Laboratory for Neuroimmunology
× corresponding author
# (joint) last author

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