Cellular Markers in Treated or Untreated Non-tuberculous Mycobacterial Respiratory Infection in Patients With Cystic Fibrosis
For patients and families
In plain language
An automatic summary of structured registry data. It is an orientation aid, not a substitute for the official protocol or a physician assessment.
- What is being studied
- The protocol lists: Scheduled visit (V1).
- Who it may be relevant to
- Registry conditions: Non-Tuberculous Mycobacterial Pneumonia. Basic parameters: from 18 years · All.
- What needs checking
- Age, condition and sex are only basic indicators. Prior treatment, laboratory values and other mandatory requirements appear in the eligibility criteria below.
- Where it takes place
- France
- Next step
- Save the trial, show it to the treating physician, and confirm current recruitment with the study center. Costs, documents and travel →
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Official title
Cellular Markers During a Non-tuberculous Mycobacterial Respiratory Infection, Treated or Untreated, in Patients With Cystic Fibrosis
Overview
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.
Detailed description
Background: Evidence shows that Non-tuberculous Mycobacterial (NTM) infections have increased and are 1,000 to 8,000 times more frequent in patients with cystic fibrosis compared to the general population. The diagnosis is based on clinical, radiological, and microbiological criteria. Unfortunately, the first two criteria lack specificity, and microbiological detection of NTM is limited due to frequent sputum contamination by other pathogens in cystic fibrosis patients. Given these factors and the high incidence of NTM infections in this population, alternative diagnostic methods are necessary.
Aim: This study aims to validate an innovative diagnostic test based on the IGRA (Interferon-Gamma Release Assay) method, which measures T lymphocyte response to Interferon gamma (IFNγ). The test will be conducted on a subset of patients selected from the CIMeNT cohort (ID-RCB: 2017-A00025-48). This cohort consists of cystic fibrosis patients whose NTM infection prevalence has been previously assessed.
Method: This research is a multicenter case-control study. It includes two groups: a case group of patients with positive serological and/or microbiological responses indicating NTM infection, and a control group of patients without such responses. The test measures the host's immune response by evaluating circulating T cell activity. Specifically, it measures IFNγ release when T cells are in contact with NTM antigens. This method provides more informative diagnostics of NTM infection dynamics compared to serology or microbiology, which have known technical limitations.
The study involves a single visit, which is part of the routine care for cystic fibrosis patients. During this visit, a routine blood draw will be performed and an additional 7 ml tube will be collected.
Interventions
- Other 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.
Primary outcome measures
- Determination of interferon-gamma release assay [Time frame: day 1 (V1)]
Secondary outcome measures (1)
- Evaluation of T lymphocyte response [Time frame: day 1 (V1)]
Eligibility criteria
Inclusion criteria
- Patient ≥18 years
- Patient previously included in the CIMeNT study
- Patient with a confirmed diagnosis of cystic fibrosis regardless of CFTR genotype
- Patient affiliated to the social security system
- Patient registered in the French Cystic Fibrosis Registry
- Adult patient capable of spontaneous expectoration or after induction
Exclusion criteria
- Lung transplant patients
- Person placed under judicial protection
- Pregnant and breastfeeding women
Criteria are shown verbatim from the registry (in English). Final eligibility is always assessed by the study center.
Healthy volunteers: No
Study design
- Observational model
- Case-control
Study locations
France · 1 center
- CHU de Montpellier - Hôpital Arnaud de Villeneuve — Montpellier
Identifiers
NCT: NCT06602869 · RECHMPL24_0124