Kidney disease and plasma cell dyscrasias: ambiguous cases solved by serum free light chain dimerization analysis

Olga Kukuy, Batia Kaplan*, Sizilia Golderman, Alexander Volkov, Adrian Duek, Merav Leiba, Ilan Ben-Zvi, Avi Livneh

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

4 Scopus citations


Background: Plasma cell dyscrasias (PCD) comprise a wide spectrum of disorders, which may adversely affect the kidney. However, in some PCD cases associated with kidney disease, the routine laboratory tests may be incapable to determine precisely the form of PCD, i.e., benign or malignant. Moreover, the kidney biopsy needed for precise diagnosis may be risky or declined. To overcome these limitations, we have developed and reported a new non-invasive technique based on serum free light chains (FLC) monomer (M) and dimer (D) pattern analysis (FLC MDPA), which allowed differentiation between malignant and benign PCD forms. The objective of our retrospective study was to demonstrate the utility of FLC MDPA in solving ten puzzling PCD cases complicated with kidney disease (patients 1–10). Methods: Ten patients with uncertain form of PCD or with a questionable response to treatment were studied. In addition to routine laboratory tests and clinical evaluation of the PCD patients, our previously developed FLC MDPA in sera and biochemical amyloid typing in biopsy tissues were applied. Results: The FLC MDPA aided the diagnosis of the PCD underlying or accompanying the kidney disease in patients 1–5, and helped to interpret properly the response to treatment in patients 1, 6–10. The FLC MDPA findings were confirmed by a biochemical analysis of tissue amyloid deposits and subsequently by the outcome of these patients. Conclusions: FLC MDPA is a non-invasive diagnostic test useful in the management of ambiguous cases of PCD associated with kidney disease.

Original languageEnglish
Pages (from-to)763-772
Number of pages10
JournalClinical and Experimental Nephrology
Issue number6
StatePublished - 1 Jun 2019


  • Amyloidosis
  • Free light chains
  • Kidney diseases


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