CXCL8 and rheumatoid arthritis: In FMS compared to controls:IL-1β, IL-2, IL-6, IL-8, IL-10, sIL-2 R, IFNγ, TNF: ↔ in sera +PBMCIL-1 RA: ⇑ in serumIL-8: ⇑ in plasmaIL-1 RA, IL-6: ⇑ in PBMCIL-6: ⇑ in PBMC of patients with disease duration > 2 years.