Abstract
There is a limited correlation between white matter (WM) lesion load as determined by magnetic resonance imaging and disability in multiple sclerosis (MS). The reasons for this so-called clinico-radiological paradox are diverse and may, at least partly, relate to the fact that not just the overall lesion burden, but also the exact anatomical location of lesions predict the severity and type of disability. We aimed at studying the relationship between lesion distribution and disability using a voxel-based lesion probability mapping approach in a very large dataset of MS patients. T2-weighted lesion masks of 2348 relapsing-remitting MS patients were spatially normalized to standard stereotaxic space by non-linear registration. Relations between supratentorial WM lesion locations and disability measures were assessed using a non-parametric ANCOVA (Expanded Disability Status Scale [EDSS]; Multiple Sclerosis Functional Composite, and subscores; Modified Fatigue Impact Scale) or multinomial ordinal logistic regression (EDSS functional subscores). Data from 1907 (81%) patients were included in the analysis because of successful registration. The lesion mapping showed similar areas to be associated with the different disability scales: periventricular regions in temporal, frontal, and limbic lobes were predictive, mainly affecting the posterior thalamic radiation, the anterior, posterior, and superior parts of the corona radiata. In summary, significant associations between lesion location and clinical scores were found in periventricular areas. Such lesion clusters appear to be associated with impairment of different physical and cognitive abilities, probably because they affect commissural and long projection fibers, which are relevant WM pathways supporting many different brain functions.
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Anna Altermatt: No conflicts of interest. Laura Gaetano: Temporary employee of Novartis Pharma AG. Stefano Magon: received research support from Swiss MS Society, Swiss National Science Foundation, University of Basel and Stiftung zur Förderung der gastroenterologischen und allgemeinen klinischen Forschung sowie der medizinischen Bildauswertung des Universitätsspitals Basel. Dieter Haering, Davorka Tomic: Full-time employee of Novartis Pharma AG. Jens Wuerfel: is CEO of MIAC AG. He served on advisory boards for Actelion, Biogen, Genzyme, Novartis and Roche. He received research grants from Novartis, and speaker honoraria from Bayer, Biogen, Genzyme, Novartis, Teva and Biogen. JW was supported by the DFG, the EU, the German ministry of education and research (BMBF/KKNMS) and the German ministry of economy (BMWi). Ernst-Wilhelm Radue: has received research support from Biogen Idec, Merck-Serono, Novartis and Actelion. Ludwig Kappos: Author’s institution (University Hospital Basel) has received in last 3 years and used exclusively for research support: steering committee, advisory board, and consultancy fees (Actelion, Addex, Bayer HealthCare, Biogen Idec, Biotica, Genzyme, Lilly, Merck,Mitsubishi, Novartis, Ono Pharma, Pfizer, Receptos, Sanofi, Santhera, Siemens, Teva, UCB, XenoPort); speaker fees (Bayer HealthCare, Biogen Idec, Merck, Novartis, Sanofi, Teva); support of educational activities (Bayer HealthCare, Biogen, CSL Behring, Genzyme, Merck, Novartis, Sanofi, Teva); royalties (Neurostatus Systems GmbH); grants (Bayer HealthCare, Biogen Idec, European Union, Merck, Novartis, Roche Research Foundation, Swiss MS Society, Swiss National Research Foundation). Till Sprenger: has received no personal compensation. His previous and current institutions have received payments for research, for consulting and speaking activities from: Actelion, ATI, Biogen Idec, Electrocore, Sanofi Genzyme, Mitsubishi Pharma, Teva, Novartis; grants received (EFIC-Grünenthal, Novartis Pharmaceuticals Switzerland, Swiss MS Society, Swiss National Research Foundation).
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Altermatt, A., Gaetano, L., Magon, S. et al. Clinical Correlations of Brain Lesion Location in Multiple Sclerosis: Voxel-Based Analysis of a Large Clinical Trial Dataset. Brain Topogr 31, 886–894 (2018). https://doi.org/10.1007/s10548-018-0652-9
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DOI: https://doi.org/10.1007/s10548-018-0652-9