Kappa Free Light Chain Index in Multiple Sclerosis Patients

In a study involving 73 MS patients and 214 controls, the Kappa Free Light Chain (KFLC) Index displayed a significantly higher median in MS patients compared to controls. It achieved an area under the curve (AUC) of 0.978, indicating strong diagnostic performance, with 100% sensitivity and 93% specificity at a cut-off of ≥7.49.

Tags: #MSResearch
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Source: Read original source (PMID 42837749)

This plain-English summary was written by AI from a published abstract and may contain errors. It is not medical advice. Read the original study and talk to your MS team before making decisions about treatment.

Why it matters

These findings suggest that the KFLC Index could be a superior diagnostic tool for MS compared to traditional methods like the IgG Index and OCB.

What this does not prove

The study's retrospective nature and single-center design limit its generalizability. Additionally, elevated KFLC Index levels were also found in non-MS conditions, warranting further research on specificity.

Next milestone

No next milestone was established from the available source.

Study facts

Study design: Observational
Participants / samples: 287 · Total number of participants (73 MS patients and 214 controls)
Randomised: Not reported
Controlled: Not reported
Primary endpoint met: Yes
Relevant MS type: Not reported
Publication date: 2026-10-02
Evidence reviewed: Abstract only
Regulatory approval: Not reported
Research areas: Not classified

Original sources

Primary evidenceCorrelation and diagnostic accuracy of kappa free light chain index and Oligoclonal bands in multiple sclerosis and other neurological diseases. ↗DOI: 10.1016/j.msard.2026.107956

Supporting passages (10)

study designIn this single-center retrospective study, 73 MS patients and 214 controls (n = 287) were evaluated via Mann-Whitney U test and Receiver Operating Characteristic (ROC) analysis.

subjectsMATERIALS AND METHODS: In this single-center retrospective study, 73 MS patients and 214 controls (n = 287) were evaluated via Mann-Whitney U test and Receiver Operating Characteristic (ROC) analysis.

sample sizeMATERIALS AND METHODS: In this single-center retrospective study, 73 MS patients and 214 controls (n = 287) were evaluated via Mann-Whitney U test and Receiver Operating Characteristic (ROC) analysis.

sample size basisMATERIALS AND METHODS: In this single-center retrospective study, 73 MS patients and 214 controls (n = 287) were evaluated via Mann-Whitney U test and Receiver Operating Characteristic (ROC) analysis.

primary endpoint metThe KFLC Index provides exceptional quantitative sensitivity and specificity in MS diagnosis.

comparatorWe evaluated the diagnostic performance of cerebrospinal fluid (CSF) Kappa Free Light Chain (KFLC) Index compared to conventional Oligoclonal Bands (OCB) and IgG Index.

primary endpointWe evaluated the diagnostic performance of cerebrospinal fluid (CSF) Kappa Free Light Chain (KFLC) Index compared to conventional Oligoclonal Bands (OCB) and IgG Index.

findingsRESULTS: The median KFLC Index was significantly higher in MS (45.81, IQR: 26.36-144.54) than controls (2.27, IQR: 1.74-3.11; p < 0.0001).

publication datePublication date: 2026-10-02

limitationsTitle: Correlation and diagnostic accuracy of kappa free light chain index and Oligoclonal bands in multiple sclerosis and other neurological diseases.

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