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Technical evaluation of three second generation CA 125 assays

J M Bonfrer1, A W Baan, E Jansen

  • 1Algemeen Klinisch Laboratorium, Het Nederlands Kanker Instituut/Antoni van Leeuwenhoek Ziekenhuis, Amsterdam, Nederland.

European Journal of Clinical Chemistry and Clinical Biochemistry : Journal of the Forum of European Clinical Chemistry Societies
|March 1, 1994
PubMed
Summary

Five CA 125 assays were evaluated for analytical performance in gynecological cancer patients. Newer CA 125 II assays demonstrated improved precision and reliability compared to older methods.

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Area of Science:

  • Clinical Chemistry
  • Immunoassays
  • Gynecologic Oncology

Background:

  • CA 125 is a tumor marker frequently used in gynecologic oncology.
  • Evaluating the analytical performance of different CA 125 assays is crucial for accurate patient management.
  • Previous generations of CA 125 assays had varying precision and reliability.

Purpose of the Study:

  • To compare the analytical performance of five different CA 125 assays.
  • To assess the precision, linearity, and potential interferences of these assays.
  • To evaluate the suitability of new generation CA 125 assays for clinical use.

Main Methods:

  • Analytical performance evaluation of five CA 125 assays (two homologous, three heterologous).
  • Utilized samples from healthy women and patients with gynecological malignancies.

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  • Assessed parameters including precision (intra- and inter-assay CV), linearity, carry-over, and hook effect.

    • Main Results:

    • Newer CA 125 II assays showed improved intra-assay precision (6.5% CV) compared to older LIA-mat I (11.6% CV).
    • Less than 1% of duplicate measurements required rejection with CA 125 II assays.
    • Inter-assay CVs ranged from 7.1% to 13.9% for automated systems; serum and plasma yielded similar results.
    • Excellent linearity was observed across all assays, with good correlation between them.

    Conclusions:

    • Newer generation CA 125 II assays offer enhanced precision and reliability for clinical application.
    • The evaluated assays demonstrate good analytical performance, supporting their use in monitoring gynecological malignancies.
    • Care should be taken regarding potential high-dose hook effects at concentrations above 20000 kU/l.