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  • Title: Kappa free light chains is a valid tool in the diagnostics of MS: A large multicenter study.
    Author: Leurs CE, Twaalfhoven H, Lissenberg-Witte BI, van Pesch V, Dujmovic I, Drulovic J, Castellazzi M, Bellini T, Pugliatti M, Kuhle J, Villar LM, Alvarez-Cermeño JC, Alvarez-Lafuente R, Hegen H, Deisenhammer F, Walchhofer LM, Thouvenot E, Comabella M, Montalban X, Vécsei L, Rajda C, Galimberti D, Scarpini E, Altintas A, Rejdak K, Frederiksen JL, Pihl-Jensen G, Jensen P, Khalil M, Voortman MM, Fazekas F, Saiz A, La Puma D, Vercammen M, Vanopdenbosch L, Uitdehaag B, Killestein J, Bridel C, Teunissen C.
    Journal: Mult Scler; 2020 Jul; 26(8):912-923. PubMed ID: 31066634.
    Abstract:
    OBJECTIVE: To validate kappa free light chain (KFLC) and lambda free light chain (LFLC) indices as a diagnostic biomarker in multiple sclerosis (MS). METHODS: We performed a multicenter study including 745 patients from 18 centers (219 controls and 526 clinically isolated syndrome (CIS)/MS patients) with a known oligoclonal IgG band (OCB) status. KFLC and LFLC were measured in paired cerebrospinal fluid (CSF) and serum samples. Gaussian mixture modeling was used to define a cut-off for KFLC and LFLC indexes. RESULTS: The cut-off for the KFLC index was 6.6 (95% confidence interval (CI) = 5.2-138.1). The cut-off for the LFLC index was 6.9 (95% CI = 4.5-22.2). For CIS/MS patients, sensitivity of the KFLC index (0.88; 95% CI = 0.85-0.90) was higher than OCB (0.82; 95%CI = 0.79-0.85; p < 0.001), but specificity (0.83; 95% CI = 0.78-0.88) was lower (OCB = 0.92; 95% CI = 0.89-0.96; p < 0.001). Both sensitivity and specificity for the LFLC index were lower than OCB. CONCLUSION: Compared with OCB, the KFLC index is more sensitive but less specific for diagnosing CIS/MS. Lacking an elevated KFLC index is more powerful for excluding MS compared with OCB but the latter is more important for ruling in a diagnosis of CIS/MS.
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