TNF and inflammatory bowel disease: We then examined the association of individual IBD serological markers with levels of IL-1β, IL-2R, IL-6, IL-10, IL-17, IP-10, IFNγ, TNF, MIP-1α, MIP-1β, and MCP-1, and found a positive correlation only between anti-CBir1 antibody and IL-6 (r = 0.447, p = 0.048, Figure S2).