PDX1 and pancreatic neoplasm: This phenomenon was further validated in another subcutaneous pancreatic tumor model, established by inoculating a mouse pancreatic cancer KPC cell line (Pdx1‐cre/LSL‐KrasG12D/P53R172H) overexpressing chicken ovalbumin (OVA) antigen and luciferase(KPC‐OVA‐Luc) (Figure S2A, Supporting Information), whose pathological characteristics closely resemble those of human pancreatic cancer.