TNF and Crohn disease: When the gingival crevicular fluid Th17 cytokine protein expressions were analyzed in Crohn’s patients, similar expression profiles of IL-1β, IL-6, IL-10, IL-12p40, IL-12p70, IFN-γ, and tumor necrosis factor (TNF)-α were observed in Crohn’s disease patients and in systemically healthy controls [27].