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MALDI-TOF-MS Application in M-Protein Detection and Its Associations with Clinical Laboratory Findings in Geriatrics

Jing Cheng1, Yuying Zhang2, Mingjie Cao1

  • 1Department of Geriatrics, Affiliated Ninth People's Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai, China.

Journal of the College of Physicians and Surgeons--Pakistan : JCPSP
|April 16, 2025
PubMed

Insights

Matrix-assisted laser desorption/ionization-time-of-flight mass spectrometry (MALDI-TOF-MS) shows promise for detecting M-protein in elderly individuals. This method offers an alternative to traditional, less sensitive techniques.

Area of Science:

  • Clinical Chemistry
  • Mass Spectrometry
  • Geriatric Medicine

Background:

  • Current M-protein detection methods (SPEP, IFE, sFLC) are often insensitive, laborious, time-consuming, and costly.
  • There is a need for more efficient and accurate diagnostic tools for M-protein detection, particularly in geriatric populations.

Purpose of the Study:

  • To evaluate the performance of MALDI-TOF-MS for M-protein detection in geriatric patients.
  • To compare MALDI-TOF-MS results against immunofixation electrophoresis (IFE) as the gold standard.

Main Methods:

  • Assessed MALDI-TOF-MS performance against IFE in a geriatric cohort.
  • Calculated specificity, sensitivity, and consistency of MALDI-TOF-MS.
  • Analyzed agreement for different M-protein isotypes (IgA, IgM, IgG) and biclonal M-proteins.

Main Results:

  • MALDI-TOF-MS demonstrated high specificity (92.30%), sensitivity (89.68%), and consistency (90.06%) compared to IFE.
  • Excellent agreement was observed for IgA (100%) and biclonal M-proteins (100%), with good agreement for IgM (88.89%) and IgG (87.50%).
  • Elevated glycosylated hemoglobin levels were noted in patients positive by MS but negative by IFE, suggesting potential differences in detection.

Conclusions:

  • MALDI-TOF-MS is a viable alternative method for M-protein detection in the aged.
  • The method shows high accuracy and efficiency, especially for specific M-protein types.
  • Glycosylated hemoglobin differences may influence M-protein detection outcomes between MALDI-TOF-MS and IFE.

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