Immunohistochemical analyses revealed a similar expression and distribution patterns of CDX2 (nuclear, Fig. 1H, M, R, and W), CK20 (cytoplasmic, Fig. 1I, N, S, and X), E‐Cadherin (membrane, Fig. 1J, O, T, and Y), MUC2 (extracellular, [Fig. 1K and P]; intracellular signet ring PMP [Fig. 1U and Z]) and MUC5AC (extra‐ and intracellular, Fig. 1L, Q, V, and Z') in PMP PDX tumor as in human tumors. This evidence concerns the gene MUC5AC and neoplasm.