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Blood, 1 May 2001, Vol. 97, No. 9, pp. 2900-2902
BRIEF REPORT
Serum free light-chain measurements for identifying and
monitoring patients with nonsecretory multiple myeloma
Mark Drayson,
Lian X. Tang,
Roger Drew,
Graham P. Mead,
Hugh Carr-Smith, and
Arthur R. Bradwell
From the Department of Immunology, The Medical School,
University of Birmingham, Birmingham, England, and The Binding Site,
Birmingham, England.
Using sensitive, automated immunoassays, increased concentrations
of either or free light chains (and abnormal / ratios) were detected in the sera of 19 of 28 patients with nonsecretory multiple myeloma. Four other patients had suppression of one or both
light chains, and the remaining 5 sera had normal or raised free
light-chain concentrations with substantially normal / ratios.
Six of the patients with an elevated single free light chain, who were
studied during follow-up, had changes in disease activity that were
reflected by the changes in free light-chain concentrations. It is
concluded that quantification of free light chains in serum should
prove useful for the diagnosis and monitoring of many patients with
nonsecretory myeloma.

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