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Lymphocyte transformation test for drug allergy detection: When does it work?

Andreas Glässner1, Diana Dubrall2, Leonie Weinhold3

  • 1Research Division, Federal Institute for Drugs and Medical Devices (BfArM), Bonn, Germany.

Annals of Allergy, Asthma & Immunology : Official Publication of the American College of Allergy, Asthma, & Immunology
|June 22, 2022
PubMed
Summary

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The lymphocyte transformation test (LTT) shows varying sensitivity for drug allergies. This study found that the enzyme-linked immunosorbent assay method and specific clinical factors significantly improve LTT accuracy for diagnosing drug hypersensitivity.

Area of Science:

  • Immunology
  • Pharmacology
  • Clinical Diagnostics

Background:

  • The lymphocyte transformation test (LTT) is an in vitro assay used to detect drug-induced sensitization, a key factor in allergic drug reactions.
  • Existing literature reports wide variations in LTT sensitivity, with previous reviews averaging results without accounting for individual patient data or study-specific parameters.
  • This variability highlights the need for a more nuanced understanding of factors influencing LTT performance in clinical practice.

Purpose of the Study:

  • To investigate how patient-specific and methodological factors influence the sensitivity of the lymphocyte transformation test (LTT).
  • To analyze individual patient data from multiple studies to provide a more robust assessment of LTT performance.
  • To identify key parameters that can enhance the diagnostic accuracy of the LTT for drug allergies.

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Main Methods:

  • Conducted an advanced literature search in PubMed to identify relevant studies on the lymphocyte transformation test (LTT).
  • Extracted individual patient data from 30 selected studies, encompassing a total of 721 patients.
  • Performed random-effects meta-regression analyses to statistically evaluate the impact of various parameters on LTT sensitivity.

Main Results:

  • The enzyme-linked immunosorbent assay (ELISA)-based readout demonstrated higher sensitivity (80%) compared to the radioactivity method (66%).
  • Patients with Drug Reaction with Eosinophilia and Systemic Symptoms (DRESS)/Drug-Induced Hypersensitivity Syndrome (DIHS) showed a higher likelihood of a positive LTT (OR, 2.52) compared to those with bullous reactions.
  • Testing within two weeks of the allergic event occurrence was associated with a higher probability of a positive LTT result (OR, 2.12) compared to testing between two weeks and two months.

Conclusions:

  • The sensitivity of the lymphocyte transformation test (LTT) is significantly influenced by the chosen readout method and specific clinical parameters.
  • ELISA-based LTT and consideration of clinical phenotypes like DRESS/DIHS and testing timing can improve diagnostic accuracy.
  • This meta-analysis, utilizing individual patient data, offers a higher level of evidence than previous reviews or single-study analyses for optimizing LTT application.