Epidemiology and Clinical Characteristics of Non-Tuberculous Mycobacteria Infections in Cystic Fibrosis Patients.

NCT ID: NCT03312075

Last Updated: 2018-01-04

Basic Information

• Recruitment Status: UNKNOWN
• Total Enrollment: 2000 participants
• Study Classification: OBSERVATIONAL
• Study Start Date: 2018-01-31
• Study Completion Date: 2022-01-31

Brief Summary

An increase in the prevalence of infections due to non-tuberculous mycobacteria (NTM) is observed in many countries and recent data suggest the circulation of dominant clones with a possibility of human-to-human contamination. The hypothesis is made that these infections are also increasing in France and that dominant NTM clones are circulating. The last French study carried out in 2004 already showed prevalences of up to 10% in certain French regions. It is essential to know the prevalence 8 years later, taking advantage of the new recommendations for the management of patients and samples, which will homogenize practices on French territory.

No data are currently available in France on the prevalence of positive serological responses in cystic fibrosis patients. Serological analyzes of the sera collected during this study will enable us to evaluate the performance of serology in mycobacterial culture and to identify patients with no positive respiratory specimen in culture but with positive serology indicating potential contact with a mycobacterium. The establishment of a serological follow-up of these patients will allow to correlate this result with a clinical evolution and / or the detection of NTM in subsequent samples. Serology is an innovative aspect of the CIMENT study.

Detailed Description

Non-tuberculous mycobacteria (NTM) are important new pathogens in cystic fibrosis, with prevalence estimates ranging from 6% to 13%. The diagnosis of the disease in cystic fibrosis patients is difficult because the infection may remain indolent in some cases without evidence of clinical consequence, while in other patients NTM are associated with significant morbidity and mortality. Treatment requires antibiotic therapy over a prolonged period (at least 12 to 18 months) with several drugs and varies according to NTM and their antibiotic resistance profile. The development of a specialized approach (clinicians / biologists) in the management of this infection, combined with the diagnosis and treatment of NTM infections, in cystic fibrosis patients is a research priority. It is an indispensable long-term strategy for this high-risk population.

Two main elements confirm the interest of a prevalence survey of NTM infections in cystic fibrosis (CF) patients: the diagnostic difficulty of "true" infections (as opposed to simple colonizations) to NTM, and the clinical impact on respiratory functions of NTM present in these patients. Two recent contradictory studies on the impact of NTM infections in CF patients have recently been published. The German monocentric study suggests a greater deterioration of respiratory function in CF patients not infected with NTM compared to CF patients infected with NTM. 26 patients were infected with NTM: 14/26 with M. avium complex (MAC), 10/26 with M. abscessus complex and 2/26 with M. gordonae. Only 5 patients out of a dozen positive to M. abscessus and 1 in 14 positive to MAC were treated. Comparatively, the other study found a significant deterioration in respiratory function (maximum expired volume in 1 seconde) of CF patients infected with M. abscessus. This Scandinavian national study reinforced its argument by the fact that an effective treatment made it possible to find changes in maximum expired volume in 1 seconde close to that observed before the infection. Some differences are observed in these two studies; including the age of the subjects included, older in the German study, and the number of positive lung samples per patient. The German study retained the criteria of the American Thoracic Society (ATS) / Infectious Disease Society of America (IDSA) for interpreting respiratory specimens positive for MNT. However, these criteria remain very difficult to apply for CF patients because the clinical and radiological manifestations of cystic fibrosis and mycobacterial infection are confounded and other criteria are necessary, such as the number of positive pulmonary samples: 5 vs. 2 to 4 or the decline in maximum expired volume in 1 seconde in the year prior to colonization / MNT infection (-5.8% per year vs. 0.7% per year). We see here the necessity of complementary studies, in order to be able to identify the diagnostic difficulties and the impacts of the therapeutics administered in these patients. Indeed, on the one hand the therapeutic impact is very difficult to evaluate in the face of the very weak correlation between the results of the "antibiograms" and therefore in vitro and the therapeutic effect in vivo. On the other hand, precise diagnostic interpretation remains essential, as published observational studies show real discrepancies, largely due to diagnostic biases. Recently, under the auspices of the American Foundation and the European Cystic Fibrosis Society, guidelines for the management of NTM infections in CF patients have been published. To this is added the references of Microbiology.

Several authors have shown that this diagnosis is an alternative in the context of NTM infections in cystic fibrosis patients. Indeed, as mentioned above, the microbiological diagnosis is often faulted, due to the difficulty of culturing the samples and their low yield in the context of NTM infections. An indirect diagnostic approach can only reinforce the screening of cystic fibrosis patients who have had contact with a NTM. Any serological response, although unable to date an infection, is the result of a potentially protective response of the host undergoing infection, and evidence of antibodies directed against the agent's bacterial products pathogen in circulating blood. A simple colonization does not allow the appearance of antibodies. An infectious process, even inapparent, must have taken place.

Conditions

Cystic Fibrosis

Study Design

• Observational Model Type: COHORT
• Study Time Perspective: PROSPECTIVE

Study Groups

cystic fibrosis patients

Sputum and blood samples

Sputum and blood samples

Intervention Type: OTHER

The cystic fibrosis patient will have a first series of sputum as well as a blood sample. On the same day of consultation, a second expectoration will be performed as far as possible.

Interventions

Sputum and blood samples

The cystic fibrosis patient will have a first series of sputum as well as a blood sample. On the same day of consultation, a second expectoration will be performed as far as possible.

Intervention Type: OTHER

Eligibility Criteria

Inclusion Criteria

• Patients with a confirmed diagnosis of cystic fibrosis regardless of CFTR genotype
• Affiliation to the social security system
• Patients able to expectorate spontaneously
• Patients enrolled in the French Register of Cystic Fibrosis
• Minor or major patients of expectorant age
• Consent signed by the patient or the holder of parental authority for the children

Exclusion Criteria

• Patient not registered in the French Register of Cystic Fibrosis
• Pulmonary transplant patients
• Persons deprived of liberty, persons under guardianship or curatorship, persons in emergency situations
• Person not affiliated to a social security system or not entitled

• Minimum Eligible Age: 7 Years
• Eligible Sex: ALL
• Accepts Healthy Volunteers: No

Sponsors

University Hospital, Brest

OTHER

Sponsor Role: lead

Responsible Party

Responsibility Role: SPONSOR

Locations

CHU Amiens

Amiens, , France

CHRU Brest

Brest, , France

CHU Côte de Nacre

Caen, , France

CHIC Créteil

Créteil, , France

CHU Grenoble

Grenoble, , France

CHU Lille

Lille, , France

AP-HP Hôpital Cochin

Paris, , France

CHU Bordeaux

Pessac, , France

Centre de Perharidy

Roscoff, , France

CHU Rouen

Rouen, , France

CHR Sud Réunion

Saint-Pierre, , France

AP-HP Hôpital Foch

Suresnes, , France

CHU Toulouse

Toulouse, , France

CHU Tours

Tours, , France

Countries

France

Central Contacts

Geneviève Hery-Arnaud, professor

Role: CONTACT

Genevieve.Hery-Arnaud@univ-brest.fr

0298145102 ext. +33

Facility Contacts

Claire Andrejak, Professor

Role: primary

clandrejak@gmail.com

03-22-45-59-03 ext. +33

Geneviève Hery-Arnaud, Professor

Role: primary

Genevieve.Hery-Arnaud@univ-brest.fr

0298145102 ext. +33

Karine Campbell, MD

Role: primary

campbell-k@chu-caen.fr

02-31-06-46-76 ext. +33

Laurence Bassinet, MD

Role: primary

laurence.bassinet@chicreteil.fr

01-57-02-20-80 ext. +33

Boubou Camara, MD

Role: primary

BCamara@chu-grenoble.fr

04-76-76-58-46 ext. +33

Anne Prevotat, MD

Role: primary

anne.prevotat@chru-lille.fr

pierre-Régis Burgel, Professor

Role: primary

pierre-regis.burgel@aphp.fr

01-46-33-82-53 ext. +33

Julie Macey, MD

Role: primary

julie.macey@chu-bordeaux.fr

05-57-62-32-90 ext. +33

sophie Ramel, MD

Role: primary

sophie.ramel@ildys.org

02-98-29-39-39 ext. +33

Hélène Morisse-Pradier, MD

Role: primary

helene.morisse-pradier@chu-rouen.fr

Céline Tasset, MD

Role: primary

celine.tasset@chu-reunion.fr

Dominique Grenet, MD

Role: primary

d.grenet@hopital-foch.org

01-46-25-25-82 ext. +33

Marlène Murris-Espin, MD

Role: primary

murris.m@chu-toulouse.fr

05-67-77-18-51 ext. +33

Julie Mankikian, MD

Role: primary

JMANKIKIAN@chu-tours.fr

02-47-47-98-34 ext. +33

References

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Reference Type: BACKGROUND

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Reference Type: BACKGROUND

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Other Identifiers

CIMENT (29BRC17.0001)

Identifier Type: -

Identifier Source: org_study_id