Cellular Markers in Treated or Untreated Non-tuberculous Mycobacterial Respiratory Infection in Patients With Cystic Fibrosis

Condition(s) studied

Investigational drug(s) / intervention(s)

Scheduled visit (V1): During the scheduled visit (V1), as part of routine care, a blood draw will be performed. On this occasion, an additional 7 ml tube will be collected to perform serology and culture. This will help define the group (NTM+ Cases/NTM- Controls) and measure cellular biomarkers.

Study summary

This study evaluates a diagnostic serological test for Non-Tuberculous Mycobacteria (NTM) infection in cystic fibrosis patients by measuring T cell response. It aims to highlight a dynamic response associated to the pathogen's presence. This multicenter case-control study involves two populations, providing a better understanding of the circulating T-IFNγ-MNT response in these patients.

Eligibility

Primary outcome measure(s)

• Determination of interferon-gamma release assay — day 1 (V1)
  Evaluation of T lymphocyte activation following mycobacterial antigen stimulation. The level of interferon gamma (IFN-γ) released is the measured marker of this activation, quantified in IU/ml. Sensitivity and specificity pairs will be calculated for each threshold value of the IFNγ rate in the T cell response test. A Receiver Operating Characteristic (ROC) curve will be plotted with its Area Under the Curve (AUC) and 95% confidence interval. For each threshold, sensitivity and specificity values will be computed, along with their 95% confidence intervals. The assessment aims to diagnose NTM in patients, as confirmed by serology and/or positive culture.

Trial sites (1)

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