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Validation of kappa free light chains as a diagnostic biomarker in multiple sclerosis and clinically isolated syndrome: A multicenter study.

Presslauer, Stefan; Milosavljevic, Dejan; Huebl, Wolfgang; Aboulenein-Djamshidian, Fahmy; Krugluger, Walter; Deisenhammer, Florian; Senel, Makbule; Tumani, Hayrettin; Hegen, Harald.
Mult Scler; 22(4): 502-10, 2016 Apr.
Artigo em Inglês | MEDLINE | ID: mdl-26199348

BACKGROUND:

Kappa free light chains (KFLCs) have been proposed as a diagnostic biomarker in patients with clinically isolated syndrome (CIS) and multiple sclerosis (MS).

OBJECTIVE:

The objective of this paper is to validate the diagnostic accuracy of intrathecal KFLC synthesis in a multicenter study.

METHODS:

KFLCs were measured by nephelometry under blinded conditions in cerebrospinal fluid (CSF) and serum sample pairs of patients with CIS (n = 60), MS (n = 60) and other neurological diseases (n = 60) from four different MS centers. The upper normal limit for intrathecal KFLC concentrations depending on blood-CSF barrier function was previously calculated in a cohort of 420 control patients.

RESULTS:

Diagnostic sensitivity of intrathecal KFLC synthesis, IgG synthesis according to Reiber, IgG index and oligoclonal bands (OCBs) was 95%, 72%, 73% and 93% in patients with MS and 82%, 47%, 43% and 72% in patients with CIS. Specificity of intrathecal KFLC synthesis was 95% and 98% for all other measures.

CONCLUSION:

These findings further support the diagnostic value of intrathecal KFLC synthesis in CIS and MS patients and demonstrate a valid, easier and rater-independent alternative to OCB detection.
Selo DaSilva