Quantitative and Functional Study of TH17 Lymphocytes in Horton's Disease (HD)

Inclusion Criteria: Patients * Patients who have provided written informed consent * Patients with national health insurance cover * Age: 50 to 90 years Patients with Horton' s disease : * at the diagnosis, before any treatment * or in remission * or in relapse Patients with an infectious disease : * Bacteriologically or radiologically confirmed * Presenting an inflammatory syndrome defined by : * CRP ≥ 10 mg / L * and Fibrinogen ≥ 4 g / L or ESR ≥ 30 mm at H1 Patients with neoplasia ( solid tumour or hemopathy ) : * At the diagnosis, before treatment by chemotherapy * Presenting an inflammatory syndrome defined by: * CRP ≥ 10 mg / L * and Fibrinogen ≥ 4 g / L or ESR ≥ 30 mm at H1 Controls : These are healthy volunteers recruited among blood donators at Dijon CHU, voluntary hospital personnel ( nurses, doctors and secretaries ), patients at the EPHAD ( Champmaillot centre for geriatric patients ) and patients without infectious, inflammatory, or auto-immune disease ( CRP \< 5mg / L ) or cancer recruited from the investigating departments of Dijon CHU. They will be matched for age and sex. * Age: 18 - 90 years * Patients with national health insurance cover * who have provided written informed consent * Absence of an inflammatory syndrome ( CRP \< 5 mg / L ) Exclusion Criteria : * Any patient who does not meet the inclusion criteria