RELB and cancer: Western blotting results indicated that the levels of phosphorylated IKKα/β (pIKKα/β) and phosphorylated NF‐κB2 (pNF‐κB2), which are the key kinases of the activated noncanonical NF‐κB pathway, were upregulated in cytotoxin‐induced NDCs cancer cells, alongside other components, such as NIK, p100, p52, and RelB (Figure 6C–E and Figure S4C,D, Supporting Information).