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Simultaneous Detection of Different Antibody Classes in a Multiplexed Serological Test
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Multiplex serum biomarker assessments: technical and biostatistical issues.

Lisa H Butterfield1, Douglas M Potter, John M Kirkwood

  • 1University of Pittsburgh Cancer Institute, Pittsburgh, PA 15213, USA. butterfieldl@upmc.edu

Journal of Translational Medicine
|October 13, 2011
PubMed
Summary

Standardized serum sample storage can introduce unexpected protein level variations. Lot-to-lot kit changes confound biomarker assay results, necessitating enhanced controls for accurate circulating protein analysis.

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Area of Science:

  • Biomarker discovery and validation
  • Proteomics and immunoassay standardization
  • Clinical chemistry and laboratory medicine

Background:

  • Identifying predictive and prognostic biomarkers in disease is crucial for personalized medicine.
  • Circulating proteins in blood are frequently investigated as potential biomarkers.
  • Standardization of materials and procedures is essential but challenging in biomarker studies.

Purpose of the Study:

  • To investigate unexpected variability in commonly tested serum analytes under standardized storage conditions.
  • To identify sources of variation in multiplex Luminex assays for cytokine, chemokine, and growth factor detection.
  • To highlight the impact of lot-to-lot reagent changes on biomarker data interpretation.

Main Methods:

  • Serum samples from melanoma patients and healthy donors were stored at -80°C.
  • Analyte levels were measured using multiplex Luminex assays.
  • Data analysis involved Wilcoxon rank-sum testing and Spearman's correlation.
  • Controls included Luminex kit standards, cytokine standards, and WHO cytokine controls.

Main Results:

  • Unexpected variability in analyte levels was observed in serum samples over storage time.
  • Apparent changes in cytokine, chemokine, and growth factor levels were detected.
  • Lot-to-lot variations in Luminex kit standard curve reagents confounded data interpretation.

Conclusions:

  • This study reveals previously unrecognized sources of variation in a widely used biomarker assay.
  • Additional control measures are required to ensure the accurate identification of true changes in circulating protein levels.
  • The findings emphasize the need for rigorous quality control in biomarker assay development and application.