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The kappa free light chain (FLC) index can detect intrathecal inflammation in neurological disorders, showing comparable performance to oligoclonal bands (OCB) detection. It serves as a valuable complementary tool for diagnosing inflammatory neurological disorders.

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Area of Science:

  • Neurology
  • Immunology
  • Biochemistry

Background:

  • Isoelectric focusing (IEF) detection of cerebrospinal fluid (CSF)-specific IgG oligoclonal bands (OCB) is standard for diagnosing inflammatory neurological disorders (IND), including multiple sclerosis.
  • Quantification of free light chains (FLC) is emerging as a surrogate marker for intrathecal inflammation.

Purpose of the Study:

  • To evaluate the diagnostic performance of kappa (κ) FLC measurement.
  • To compare κFLC measurement with OCB detection by IEF for diagnosing IND.

Main Methods:

  • Serum and CSF κFLCs were measured by turbidimetry using the SPAplus automated analyser.
  • The κ index was calculated in 142 samples from patients with multiple sclerosis (MS), IND, and non-inflammatory neurological disorders (NIND).
  • Patients were categorized as OCB-positive or OCB-negative.

Main Results:

  • The κFLC index was significantly elevated in OCB-positive MS and IND patients compared to OCB-negative patients.
  • κFLC index performance was comparable to IEF for MS diagnosis.
  • Using a κFLC index cutoff of 6.29, sensitivity for diagnosing IND increased to 75.7% (vs. 61.2% for IEF), with slightly lower specificity (82.1% vs. 100%).
  • Combining OCB status and κFLC index > 6.29 improved IND diagnostic sensitivity to 80.6% with equal specificity.

Conclusions:

  • The κFLC index is a reliable method for detecting intrathecal inflammation but does not differentiate MS from other IND.
  • κFLC quantification is a valuable complementary method to OCB detection for diagnosing IND.