Fig. 3
Immunohistochemical analysis of the surgical specimen (original magnification, ×40). Immunohistochemical analysis revealed MUC1 expression in both adenosquamous carcinoma (a) and intraductal papillary mucinous neoplasm (b). Expression of p53 (c) and Ki67 (d) was observed only in adenosquamous carcinoma and, specifically, on both the adenocarcinoma and squamous cell carcinoma components. p40 expression was detected only in the squamous cell carcinoma components of adenosquamous carcinoma (e). There was stronger CK5/6 expression in the squamous cell carcinoma component than in the adenocarcinoma component (f)