The abstract is read at the publisher; the summary is JClub's.
SuStaIn applied to multimodal 3 T MRI in 1017 multiple sclerosis patients identifies four reproducible MRI subtypes—lesion-led (44%), cortex-led (23%), tract-led (23%), and deep grey matter/cerebellar-led (10%).
- Why it matters: Conventional clinical categories only partially reflect biological heterogeneity, and MRI lesion, microstructural, and atrophy signals are often analyzed separately. A subtype framework is needed to link imaging biology to disability and progression.
- What they did: The study used SuStaIn on T2 lesion volume, mean diffusivity in lesions and major tracts, and cortical and deep grey matter volumes, with disability, cognition, genetic risk, and longitudinal follow-up (median 6.57 years). It validated the four-subtype structure in an independent cohort (247 patients, 141 controls).
- The result: Progressive disease was enriched in cortex-led (47%) and deep grey matter/cerebellar-led (56%), while relapsing-remitting predominated in lesion-led (66%) and tract-led (71%; P < 0.001). Disability (EDSS ≥4.0/≥6.0) and relapse-independent progression-free survival differed by subtype, and within each subtype higher SuStaIn stage predicted worse cognition (all P ≤ 0.030).
The findingWhy it mattersWhat they didThe result
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