For example; in esophageal squamous cell carcinoma abrogation of JAK-STAT3 signaling downregulates NF-κB signaling, in head and neck squamous cell carcinoma interfering with NF-κB reduced STAT3 signaling and in brain pericytes STAT3 cooperates with NF-κB to induce IL-6 production (38–40). This evidence concerns the gene IL6 and head and neck squamous cell carcinoma.