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. 2021 Dec 15;11:795891. doi: 10.3389/fonc.2021.795891

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Copyright © 2021 Sun, Liu, Lv, Li, Liao and Gong

This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

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Immunohistochemical staining of duodenal carcinomas tissue. (A) Immunohistochemical stains of intestinal type: positive for CDX2 (left), CK20 (middle), and MUC2 (right) markers. (B) Immunohistochemical stains of gastric type: positive for MUC5AC (middle) and MUC6 (right) markers. (C) Immunohistochemical stains of pancreatic type: positive for MUC1 (middle) and CK7 (right) markers.