Description

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.