Impact of Familial Multiple Sclerosis on Disease Progression in Human Subjects
In a study of 3,094 individuals with multiple sclerosis (MS), no significant links were found between having a family history of MS and long-term disability progression, cognitive decline, or MRI activity. Hazard ratios for disability worsening among those with first and second-/third-degree relatives were close to 1.0, indicating minimal difference compared to those without a known family history.
- Most relevant to
- Neurologist, Geneticist
Why it matters
These findings suggest that a family history of MS may not significantly alter disease outcomes once MS has developed, challenging existing assumptions about familial influences on MS progression.
What this does not prove
This study does not prove that familial MS influences long-term outcomes, and the reasons behind these observations remain unclear.
Next milestone
No next milestone was established from the available source.
Study facts
- Study design
- Observational
- Participants / samples
- 3094 · basis not reported
- Randomised
- Not reported
- Controlled
- Not applicable
- Primary endpoint met
- No
- Relevant MS type
- Not reported
- Publication date
- 2026-09-26
- Evidence reviewed
- Abstract only
- Regulatory approval
- Not reported
- Research areas
- Not classified
Original sources
- Primary evidenceImpact of Family History on MS Outcomes ↗
Supporting passages (11)
study designWe investigated whether familial MS, including degree of relatedness, is associated with baseline characteristics and disease outcomes.
subjectsMETHODS: We included individuals with incident MS from the Swedish population-based epidemiologic investigation of multiple sclerosis study with longitudinal follow-up through the Swedish MS registry.
sample sizeAmong 3,094 participants, 239 (7.7%) reported a first-degree relative with MS and 468 (15.1%) reported a second-/third-degree relative with MS.
controlledNo significant associations were observed between familial MS status and disability progression, cognitive decline, MRI disease activity, or patient-reported worsening.
primary endpoint metNo significant associations were observed between familial MS status and disability progression, cognitive decline, MRI disease activity, or patient-reported worsening.
publication datePublication date: 2026-09-26
comparatorCompared with individuals without a known family history of MS, the HR for CDW was 1.06 (95% CI 0.89-1.30) among individuals with first-degree familial MS and 1.04 (95% CI 0.90-1.20) among those with second-/third-degree familial MS.
primary endpointOutcomes included confirmed disability worsening (CDW), progression to Expanded Disability Status Scale milestones 3 and 4, cognitive worsening measured by the symbol digit modalities test, MRI disease activity, and worsening on the Multiple Sclerosis Impact Scale-29.
follow uplongitudinal follow-up through the Swedish MS registry.
findingsFamily history of MS did not appear to have a substantial prognostic impact on long-term disease outcomes after MS onset.
limitationsBACKGROUND: Family history is a well-established risk factor for multiple sclerosis (MS), but its influence on disease progression remains unclear.
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