Skip to navigation Skip to content



“NfL” Biomarker Associated with Disability Progression in Large Swedish Study of People with MS

May 20, 2020

Higher blood levels of a molecule called Neurofilament light chain (NfL) were associated with progression of disability in blood samples from 4,385 people with MS. Although further study is needed before this blood test can be used routinely to predict disease course and guide the care of individuals with MS, these findings add to growing evidence that NfL has potential as a predictive biomarker of MS disease activity and disability progression. .
  • NfL is a fragment that is part of the debris that enters the spinal fluid and blood when nerve wires (axons) are damaged. Studies of NfL in the bloodstream and in spinal fluid have been underway to better define how this biomarker may be employed to help detect and predict disease activity and response to treatments, not only in MS but in other disorders.
  • In this large study, the researchers identified 4,385 people with MS from Swedish MS registries, and 1,026 people who did not have MS. They tested NfL levels in blood samples and followed the participants for five years.
  • People with MS had significantly higher levels of NfL in their blood, compared to people without MS. Higher NfL levels were significantly associated with worsening disability during the next year and with the likelihood of reaching moderate disability (affecting daily activities but not walking ability).
  • This large study adds to a growing body of knowledge needed to determine the best use of NfL as a biomarker for MS care, treatment decisions, and clinical trials. Additional studies underway will help standardize its use and help understand how age and other health conditions impact NfL levels. 
Plasma neurofilament light levels are associated with the risk of disability in multiple sclerosis” by Ali Manouchehrinia, PhD, and colleagues from the Karolinska Institutet was published on May 20, 2020 in Neurology.

About Multiple Sclerosis

Multiple sclerosis is an unpredictable, often disabling disease of the central nervous system. There is currently no cure for MS. Symptoms vary from person to person and range from numbness and tingling, to mobility challenges, blindness and paralysis. An estimated 1 million people live with MS in the United States. Most people are diagnosed between the ages of 20 and 50, and it affects women three times more than men.

About the National Multiple Sclerosis Society

The National MS Society, founded in 1946, funds cutting-edge research, drives change through advocacy, and provides programs and services to help people affected by MS live their best lives. Connect to learn more and get involved:, Facebook, Twitter, Instagram, YouTube or 1-800-344-4867.


© 2021 The National Multiple Sclerosis Society is a tax exempt 501(c)3 nonprofit organization. Its Identification Number (EIN) is 13-5661935.