TBK1 and cancer: Tank‐binding kinase 1 (TBK1) and its homologue IKKε are serine/threonine kinases that activate type I IFN and antiviral immunity by phosphorylating IRF3 and IRF7.[38] Upon viral infection, the stimulator of interferon genes (STING) binds with TBK1, thus to enhance the phosphorylation of TBK1 at S172 (pS172‐TBK1), which is located within the classical kinase activation loop of TBK1.[39] TBK1 is also involved in cancer progression,[40] but its mechanism is unclear.