NFKB1 and esophageal squamous cell carcinoma: PDFD‐D plays an important role in cell proliferation, apoptosis, transformation, invasion, metastasis, angiogenesis and other biological processes,59 and its downregulation expression has been reported to inhibit the NF‐κB pathway for cell proliferation and invasion, and induce apoptosis in esophageal squamous cell carcinoma.30