Biomarkers for Diagnostic, Prognostic and of Response to Treatment in Adult Langerhans Cell Histiocytosis
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: Blood sampling, Biopsy, Blood sampling.
- Who it may be relevant to
- Registry conditions: Histiocytosis, Langerhans-Cell. 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
Biomarqueurs Diagnostiques, Pronostiques et de réponse au Traitement Dans l'Histiocytose Langerhansienne de l'Adulte
Overview
Adult Langerhans histiocytosis (LCH) is a rare disease of unknown etiology, characterized by the activation of the MAPK (Mitogen-activated protein kinases) pathway, driven by various somatic mutations in the specific lesions of involved organs/tissues. LCH is currently classified as myeloid neoplasia with an inflammatory component. In patients with active systemic LCH, MAPK mutations may also be identified in plasma free cell DNA in patients. In contrast, circulating MAPK mutations seem more rarely detected in patients with LCH limited to a single organ/tissue (single system disease), but this has not been accurately assessed in a large series of patients. The clinical presentation of LCH is very diverse, the prognosis variable, and the evolution marked by the occurrence of flares of the disease. A definitive diagnosis of LCH warrants histological confirmation obtained by a biopsy of an involved organ. In case of Pulmonary Langerhans cell histiocytosis (PLCH), a presumptive diagnosis is often acceptable when lung-computed tomography (CT) shows a nodulo-cystic pattern after excluding alternative diagnoses. In contrast, in case of purely cystic lung CT pattern, PLCH may be difficult to differentiate from other diffuse cystic lung diseases (mainly lymphangioléiomyomatose (LAM) and BHD (Birt-Hogg-Dubé syndrom), and eventually other rare disorders). Advanced PLCH may even be misdiagnosed as pulmonary emphysema that also occurs in smokers. In these situations, confirmation of PLCH warrants lung tissue, obtained most often by surgical lung biopsy that comprises significant morbidity or is not feasible in patients with altered lung function. Thus, the identification of specific blood biomarkers of cystic PLCH would be very useful. On another hand, personalized management of adult patients with LCH is limited given the absence of predictive factors for prognosis or response to treatment. The aim of this prospective study is to describe precisely the clinical phenotype at diagnosis and during follow-up of a large cohort of adult LCH patients and to seek for blood biomarkers eventually associated with prognosis or response to specific treatment. For patients with cystic PLCH specific markers for non-invasive diagnosis will also be investigated. In the subgroup of patients with Single system (SS) LCH and specific driver MAPK mutation in tissue lesions, we will also look for the identification of this mutation in plasma free DNA at the time of a flare of the disease.
Interventions
- Other Blood sampling
* at first visit in the reference center * at each follow-up visit ( once a year) * before and after specific treatment * in case of flare - Other Biopsy
In case of flare - Other Blood sampling
Once at inclusion visit
Primary outcome measures
- Description of the clinical phenotype at diagnosis and the outcome of adult LCH patients [Time frame: Up to 10 years]
Secondary outcome measures (4)
- Evaluation of the prognostic performance of blood biomarkers for adult LCH patients [Time frame: Up to 10 years]
- Evaluation of the predictive performance of blood biomarkers for the therapeutic response [Time frame: Up to 10 years]
- Evaluation of the diagnostic performance of blood biomarkers for patients with purely cystic Pulmonary Langerhans cell histiocytosis [Time frame: Up to 10 years]
- Evaluation of the presence of MAPK tissue mutation in plasma cell free DNA for patients with Single System LCH at the time of a flare of the disease [Time frame: Up to 10 years]
Eligibility criteria
Inclusion criteria
LCH patients :
- Age ≥ 18 years
- All confirmed LCH seen at the reference center whatever the clinical presentation
Controls :
- Age ≥ 18 years
- Patients with diffuse lung cystic disease, pulmonary emphysema and healthy smokers
All :
- Signing an informed consent
- Patients with health insurance
Exclusion criteria
- Persons under guardianship or curatorship, or deprived of freedom by a judicial or administrative decision.
- People benefiting from Medical Aid from the State (AME)
- Pregnant women, parturient and mothers who are breastfeeding.
- Persons subject to psychiatric care and persons admitted to a health or social establishment for purposes other than research
- Persons unable to express their consent
Criteria are shown verbatim from the registry (in English). Final eligibility is always assessed by the study center.
Healthy volunteers: Yes
Study design
- Observational model
- Cohort
Study locations
France · 1 center
- Hopital Saint Louis — Paris
Identifiers
NCT: NCT06197204 · APHP230748