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Related Experiment Videos

Cellular allergen stimulation test (CAST) 2003, a review.

A L de Weck1, M L Sanz

  • 1Department of Allergology and Clinical Immunology, Clinica Universitaria de Navarra, University of Navarra, Pamplona, Spain.

Journal of Investigational Allergology & Clinical Immunology
|March 2, 2005
PubMed
Summary

The CAST assay, a cellular test measuring sulfidoleukotrienes, shows diagnostic value for allergies, especially when other tests fail. Further research is needed to address remaining questions and improve its global adoption in allergy diagnosis.

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Area of Science:

  • Clinical immunology
  • Allergy diagnostics
  • In vitro cellular assays

Background:

  • Traditional allergy diagnosis relies on skin prick tests and specific IgE measurements.
  • Cellular tests, like histamine release and basophil degranulation, have had limited routine use.
  • The CAST assay measures sulfidoleukotrienes from allergen-stimulated basophils.

Purpose of the Study:

  • To evaluate the diagnostic value of the CAST assay.
  • To assess its utility in cases where other diagnostic methods are unreliable.
  • To explore its application in non-IgE-mediated immediate hypersensitivity reactions.

Main Methods:

  • A meta-analysis of 37 validated studies involving 1614 patients and 1145 controls.
  • In vitro stimulation of IL-3 primed basophils with allergens.

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  • Measurement of sulfidoleukotrienes (LTC4, LTD4, LTE4) as a marker of basophil activation.

    • Main Results:

    • The meta-analysis provides strong evidence for the diagnostic value of the CAST assay.
    • The test is particularly useful for diagnosing food and drug allergies.
    • It also shows potential in identifying non-IgE-mediated immediate hypersensitivity reactions.

    Conclusions:

    • The CAST assay is a valuable tool in allergy diagnostics, especially for complex cases.
    • Further systematic exploration of open questions could enhance its clinical application.
    • Wider global acceptance may depend on addressing practical limitations and demonstrating consistent utility.