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