title: Pulmonary adenocarcinomas with enteric differentiation: histologic and immunohistochemical characteristics compared with metastatic colorectal cancers and usual pulmonary adenocarcinomas.
abstract: Primary pulmonary adenocarcinomas with enteric differentiation (PAED) are mainly composed of tall-columnar cells that show similarity to intestinal epithelia and colorectal carcinomas. In this study, we analyzed the immunostaining profiles of 7 PAEDs in comparison with 14 metastatic colorectal carcinomas (MCRs) and 30 usual pulmonary adenocarcinomas (PACs), using antibodies against CDX-2, cytokeratin 7 (CK7), cytokeratin 20 (CK20), TTF-1, surfactant apoprotein-A (SP-A), Napsin A, and MUC2. The positive rates for CDX-2, CK7, CK20, TTF-1, SP-A, Napsin A, and MUC2 were 71%, 100%, 43%, 43%, 14%, 0%, and 43%, respectively, in the PAEDs; 100%, 0%, 86%, 0%, 0%, 0%, and 57% in the MCRs; 3%, 100%, 0%, 93%, 73%, 90%, and 0% in PACs. As expected, immunoreactivity of CDX-2, CK20, and MUC2 was detected in PAEDs. The observed decrease or loss of immunoreactivity for TTF-1, SP-A, and Napsin A indicates that these lesions demonstrate a shift away from their pulmonary phenotype, although CK7 expression was retained. The results indicate that CK7 and CK20 may be useful markers for distinction of PAEDs from MCRs.
authors.affiliation: Department of Pathology, Cancer Institute, Japanese Foundation for Cancer Research, Tokyo, Japan.
authors.forename: Kentaro
authors.initials: K
authors.lastname: Inamura
authors.forename: Yukitoshi
authors.initials: Y
authors.lastname: Satoh
authors.forename: Sakae
authors.initials: S
authors.lastname: Okumura
authors.forename: Ken
authors.initials: K
authors.lastname: Nakagawa
authors.forename: Eiju
authors.initials: E
authors.lastname: Tsuchiya
authors.forename: Masashi
authors.initials: M
authors.lastname: Fukayama
authors.forename: Yuichi
authors.initials: Y
authors.lastname: Ishikawa
mesh_terms: D000230:Adenocarcinoma / Q000737:chemistry / Q000556:secondary*; D014408:Biomarkers, Tumor / Q000032:analysis; D002452:Cell Count; D002471:Cell Transformation, Neoplastic; D015179:Colorectal Neoplasms / Q000737:chemistry / Q000473:pathology*; D005260:Female; D006801:Humans; D007124:Immunoenzyme Techniques; D008175:Lung Neoplasms / Q000737:chemistry / Q000473:pathology* / Q000556:secondary*; D008297:Male; D009367:Neoplasm Staging
chemical_list: D014408:Biomarkers, Tumor