New Definition of Light Chain Monoclonal Gammopathy of Undetermined Significance.

Importance: Recent studies suggest standard reference intervals for serum free light chains (FLC) are inaccurate and that this problem can only be partially remedied by using separate reference intervals for individuals with impaired kidney function. This decreases the utility of FLC testing in the clinical evaluation and follow-up of plasma cell disorders, particularly affecting the diagnosis of light chain (LC) monoclonal gammopathy of undetermined significance (MGUS).

Objective: To evaluate the distribution of serum FLC and FLC ratios in individuals with preserved kidney function and to propose revised reference intervals and a new definition of LC-MGUS.

Income and education affect prognosis and treatment in symptomatic myeloma : A population-based study on 8672 multiple myeloma patients diagnosed 2008-2021 from the Swedish myeloma registry.

Despite advancements in multiple myeloma treatment, prognostic variability persists. We investigated the impact of income and education on treatment and survival in a country with publicly funded healthcare. We analysed data from the Swedish Myeloma Registry (2008-2021) linked to national registers.

Approaching hypercalcemia in monoclonal gammopathy of undetermined significance: insights from the iStopMM screening study.

Hypercalcemia in monoclonal gammopathy of undetermined significance (MGUS) presents a clinical challenge because it may indicate progression to multiple myeloma (MM) but could also be due to a multitude of unrelated disorders. To inform the approach to this clinical challenge, we conducted a nested cohort study within the Iceland Screens, Treats, or Prevents Multiple Myeloma screening study. Of the 75 422 Icelanders aged 40 years and above who underwent screening for MGUS, we included 2546 with MGUS who were in active follow-up, including regular serum calcium measurements.

Defining new reference intervals for serum free light chains in individuals with chronic kidney disease: Results of the iStopMM study.

Serum free light chain (FLC) concentration is greatly affected by kidney function. Using a large prospective population-based cohort, we aimed to establish a reference interval for FLCs in persons with chronic kidney disease (CKD). A total of 75422 participants of the iStopMM study were screened with serum FLC, serum protein electrophoresis and immunofixation.