Serum Neurofilament-light Chain and GFAP Levels in Patients From the OFSEP Cohort at Different Landmarks of Multiple Sclerosis

Prior treatment

• The patient is in an exclusion period determined by a previous study.

Other illness

• Clinically isolated syndrome (CIS) that does not meet the criteria of MS.
• Radiologically isolated syndrome (RIS).
• Patient with Neuromyelitis optica spectrum disorder.

Age

• The patient is under 15 years old.

Other

• Within the past three months, the patient has participated in another interventional study that may interfere with the results or conclusions of this study.
• The patient is under judicial protection.
• The patient refuses to sign the consent.
• It is impossible to correctly inform the patient (inability to understand the study, language problem).
• The patient is pregnant or breast-feeding.
• Inability to answer questionnaires.

• The patient has been correctly informed.
• The patient must have given their informed and signed consent.
• The patient must be insured or beneficiary of a health insurance plan.
• The patient is at least (≥)15 years old.
• The patient has MS according to diagnosis criteria (Thompson et al. 2017) and:
  • Participates to the OFSEP-HD cohort (ancillary study);
  • Has a Expanded Disability Status Scale score comprised between 0 - 7.0;
  • With or without Disease Modifying Drug;
  • For Work Package 3: patients enrolled in any OFSEP-HD centre that meet landmark criteria for an active MS (relapse, or Expanded Disability Status Scale progression, or active MRI) during follow-up;
  • For Work Package 4: patients with a stable disease enrolled in OFSEP-HD study in Nîmes or Nantes University Hospitals.