Cohort of Patients With Systemic Granulomatosis and Associated Biological Collection

Systemic granulomatosis is a group of diseases whose common feature is the anatomopathological existence of giganto-cellular granulomas composed of macrophages, epithelial cells and CD4+ T lymphocytes. The exact cause of the development of these granulomas remains unknown, although numerous studies suggest the hypothesis of environmental factors (infectious, exposure to particles) and genetic susceptibility factors. The persistence of granulomas is deleterious, ultimately leading to local destruction and tissue damage resulting in fibrosis of neighbouring tissues. Granulomatosis is a heterogeneous group in terms of aetiology: schematically, either an aetiology is identified: infection, environmental factors (berylliosis, pneumoconiosis), iatrogenesis (drugs), neoplasia, immune deficiency; or granulomatosis is said to be idiopathic, the most common case, falling within the definition of systemic sarcoidosis. Therefore, with a view to future research work, it seems imperative to set up a biological bank of patients being monitored for systemic granulomatosis within the division. It is particularly important to identify genetic variants, circulating biomarkers associated with the onset, severity and response to treatment of these diseases. The main aim of the "GRAMI-BIO" study is to describe the clinical evolution of patients with systemic granulomatosis (sarcoidosis and other granulomatoses) followed at the Bordeaux University Hospital, and to collect samples from blood fractionation (serum bank, plasma bank, urine bank, DNA, RNA bank) to constitute a biobank.

Inclusion criteria

• Patients aged 18 or over
• Patients with systemic granulomatosis (diagnosis proven by anatomopathological sampling) at diagnosis.
• Persons affiliated to or benefiting from a social security scheme.
• Free, informed and written consent signed by the participant and the investigator (at the latest on the day of inclusion and before any examination required by the research).

Exclusion criteria

• Patients infected with human immunodeficiency virus (HIV), Hepatitis B virus (HBV) and/or Hepatitis C virus (HCV)
• Pregnant or breast-feeding women
• Patients already receiving specific treatment for systemic granulomatosis
• Persons deprived of their liberty by a judicial or administrative decision, minors, persons of legal age who are the object of a legal protection measure or unable to express their consent.