This study will assess the feasibility of using cytokine expression profiles in blood samples as a method for evaluating rheumatoid polyarthritis

Inclusion Criteria:

• The patient must have given their free and informed consent and signed the consent form
• The patient must be a member or beneficiary of a health insurance plan
• Patient is at least 18 years old
• Subjects included as patients have rheumatoid polyarthritis according to ACR EULA 2010, DAS28>3.2 criteria
• Subjects included as controls are healthy volunteers who have no overexpression of cytokines

Exclusion Criteria:

• The subject is participating in an interventional study, or is in a period of exclusion determined by a previous study
• The subject refuses to sign the consent
• It is impossible to give the subject informed information
• The patient has had at least 3 months of specific treatment that can potentially impact cytokine profile