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Clinical Chemistry and Laboratory Medicine (CCLM)

Published in Association with the European Federation of Clinical Chemistry and Laboratory Medicine (EFLM)

Editor-in-Chief: Plebani, Mario

Ed. by Gillery, Philippe / Greaves, Ronda / Lackner, Karl J. / Lippi, Giuseppe / Melichar, Bohuslav / Payne, Deborah A. / Schlattmann, Peter


IMPACT FACTOR 2018: 3.638

CiteScore 2018: 2.44

SCImago Journal Rank (SJR) 2018: 1.191
Source Normalized Impact per Paper (SNIP) 2018: 1.205

Online
ISSN
1437-4331
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Volume 47, Issue 9

Issues

Serum free light chains: diagnostic and prognostic value in multiple myeloma

Pavai Sthaneshwar / Veerasekaran Nadarajan / Jayaranee A.S. Maniam / Nani Nordin / Gan Gin Gin

Abstract

Background: Measurement of serum free light chains (FLCs) has recently become available for the diagnosis and monitoring of patients with plasma cell dyscrasias. The aim of this study was to investigate the performance of the serum FLC assay as a tumour marker by comparing FLC concentrations with serum protein electrophoresis (PE) results in the diagnosis of multiple myeloma (MM). In addition, we also evaluated the prognostic value of the baseline serum FLC ratio in patients with MM.

Methods: We measured FLC concentrations and calculated the kappa/lambda (κ/λ) FLC ratios for three groups (control, polyclonal gammopathy and MM).

Results: The FLC ratio at a cut-off threshold of 2.0 showed higher sensitivity and specificity compared with serum electrophoresis for the diagnosis of MM. We used the median FLC ratio of >57.5 and <0.04 for κ and λ secretors, respectively, for assessing survival. Survival was 30 months in patients with the κ/λ ratio of >57.5 and <0.04 compared to 47 months in patients with the ratio <57.5 and >0.04, indicating that more abnormal serum FLC ratios are associated with poorer survival (p<0.011).

Conclusions: Despite the limitations of the assay, the results of our study indicate that the FLC assay in combination with serum PE has an increased sensitivity in the diagnosis of MM. Also, baseline measurement of the κ/λ ratio provides prognostic information in these same patients.

Clin Chem Lab Med 2009;47:1101–7.

Keywords: β2-microglobulin; multiple myeloma; serum electrophoresis; serum free light chains

About the article

Corresponding author: Pavai Sthaneshwar, Department of Pathology, University of Malaya, 50603 Kuala Lumpur, Malaya


Received: 2009-05-02

Accepted: 2009-06-26

Published in Print: 2009-09-01


Citation Information: Clinical Chemistry and Laboratory Medicine, Volume 47, Issue 9, Pages 1101–1107, ISSN (Online) 1437-4331, ISSN (Print) 1434-6621, DOI: https://doi.org/10.1515/CCLM.2009.260.

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