Neurofilament Light Chain Levels in a Large Idiopathic Peripheral Neuropathy Cohort

Area of Science:

• Neurology
• Biomarker Research
• Peripheral Neuropathy

Background:

• Neurofilament light chain (Nf-L) is a known biomarker for neurodegeneration in various neuromuscular conditions.
• Idiopathic peripheral neuropathy (IPN) is the second most common axonal polyneuropathy subtype.

Purpose of the Study:

• To investigate the utility of Nf-L as a biomarker in idiopathic peripheral neuropathy (IPN).

Main Methods:

• Quantified Nf-L levels in plasma from 294 IPN patients using ultrasensitive digital immunoassay.
• Included patients with confirmed IPN via electrodiagnostic testing, IENFD, and/or neuromuscular examination.
• Ensured all participants had normal standard laboratory testing for polyneuropathy.

Main Results:

• Majority (78.1%) of IPN patients had age-adjusted normal Nf-L levels.
• Elevated Nf-L correlated with higher neuropathy severity scores and abnormal electrodiagnostic findings.
• Nf-L levels did not correlate with disease duration, neuropathic pain, or paresthesia location; age was the strongest correlate.

Conclusions:

• Nf-L levels in IPN correlate with disease severity but are normal in most patients.
• The limited range of Nf-L in IPN restricts its utility as a biomarker in clinical trials for new treatments.