There is an article in The Lancet proposing a reclassification of MS--abandoning the categories of RRMS, SPMS, RPMS, PPMS. Now ECTRIMS is conducting a Webinar about this proposed new method of classifying MS:
ECTRIMS Webinar: Redefining How MS is Classified
Summary of the Lancet article:
Multiple sclerosis progression: time for a new mechanism-driven framework - ScienceDirect