CXCL8 and neoplasm: F. nucleatum binds to E-cadherin of intestinal epithelial cells through FadA, activates the β-catenin signaling pathway, induces NF-κB pathway activation, upregulates proinflammatory cytokines (TNF-α, IL-6, IL-8 and IL-1β), and induces Fap2 to bind to TIGIT receptors on NK cells and other tumor infiltrating lymphocytes (TILs) thus promoting cancer progression and immune escape 76, 77.