It is interesting that this is finally getting contested, because it was introduced artificially by the pharma industry to get interferons approved.
Progressive Forms of Multiple Sclerosis: Distinct Entity or Age-Dependent Phenomena.
https://www.ncbi.nlm.nih.gov/pubmed/29157397
Abstract
In multiple sclerosis (MS), disease course is defined by a subclinical or clinical relapsing remitting phase, a progressive phase, and the overlapping phase in-between. Each phase can have intermittently active or inactive periods.
Subclinical activity in radiologically isolated syndrome evolving to primary-progressive MS is mostly indistinguishable from relapsing-remitting MS evolving to secondary-progressive MS.
The onset of progressive-phase MS is age-dependent but time and pre-progressive phase agnostic.
Pathologic hallmarks of progressive MS onset also appear to be age-dependent but pre-progressive phase agnostic. Onset of progressive MS is characterized by a peak in smoldering plaques.
Report against division of MS in clinical types
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