Light chain monoclonal gammopathy of undetermined significance is characterized by a high disappearance rate and low risk of progression on longitudinal analysis
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We determined the 10-year progression rate of light chain monoclonal gammopathy of undetermined significance (LCMGUS) and investigated potential associations with cancer utilizing the German population-based Heinz Nixdorf Recall Study. The Heinz Nixdorf Recall Study comprises 4814 men and women aged 45–75 years. Serum samples from baseline (2000–2003) and five-year (2006–2008) and 10-year (2011–2015) follow-up examinations were screened for monoclonal free light chains (FLC). LCMGUS was defined as abnormal FLC ratio, increase of involved FLC with complete loss of immunoglobulin heavy chain, and absence of a history of lymphoproliferative disease (LPD). Seventy-five individuals with LCMGUS were identified across all three evaluation time points (median age 64 years; 43 (57%) male; FLCR > 1.65 65 (87%); FLCR ≤ 0.65 10 (13%)). After a median observation time of 11.5 years, none of the LCMGUS cases had progressed to overt LPD; in particular, we did not observe incident light chain multiple myeloma. On serial analysis 17/31 (55%), LCMGUS could not be confirmed and disappearance of the monoclonal protein was associated with low concentrations of the involved FLC. Individuals with LCMGUS had a 1.5-fold increased risk of cancer but did not show differences in overall survival or renal function as compared to individuals with normal FLC. In conclusion, LCMGUS represents a relatively benign condition with a high disappearance rate of the monoclonal protein on longitudinal analysis and normal overall survival at least in the population-based setting.
KeywordsLight chain MGUS Germany Population-based Cancer Renal disease
We thank the participants of the Heinz Nixdorf Recall Study. We also thank the investigative group and the study personnel of the Heinz Nixdorf Recall Study.
Compliance with ethical standards
Conflict of interest
The authors declare that they have no conflict of interest.
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