30 RA patients starting an anti-TNF will be recruited.~Before and after 6-months of anti-TNF treatment, blood will be collected using the TruCulture system (2x 1ml in non-stimulated and Lipopolysaccharide (LPS)-stimulated TruCulture tubes) to measure Whole Blood Oxylipin Response (WBOR), cytokine response, PUFA cell content and gene expression under homeostatic and stimulated conditions (i.e. LPS).~At baseline and after 6 months of treatment, the rheumatologist will perform a clinical evaluation of their RA patients using Disease Activity Score using 28 joint-count (DAS28-CRP). Non-responders will be defined as RA patients failing to achieve good or moderate EULAR response after 6 month of anti-TNF treatment, discontinued the drug, initiated a new bDMARD, or increased dosage of oral corticosteroids greater than 10 mg/d at the second visit.
OPERA aims to better understand and predict the responsiveness of rheumatoid arthrits (RA) patients to biological disease modifying anti-rheumatic drugs (bDMARDs).~Our objectives will be (i) to determine, at baseline, the differences of oxylipin response between responders vs non-responders to Anti-Tumor necrosis factor (Anti TNF) and (ii) to investigate the relationships between the oxylipin response, the polyunsatured fatty acid (PUFA) content of immune cells and the cytokine response.