title: Epithelial and organ-related marker expression in pituitary adenomas.
abstract: The histologic expression of epithelial and organ-related immunohistochemical markers in primary sellar region tumors has received little attention to date. This lack of empirical data may lead to mistaken assumptions in the evaluation of sellar region neoplasms. To address this issue, the frequency and specificity of epithelial (cytokeratin 7(CK7), CK20) and organ-related differentiation markers (gross cystic disease fluid protein-15 (GCDFP-15), thyroid transcription factor-1 (TTF-1), Napsin A, paired box 8 (PAX-8), hepatocyte paraffin 1 (HepPar1) and estrogen receptor (ER)) were studied in 40 patients with adenomas comprising five hormonal sub-types. Non-parametric statistical procedures were used to examine associations between marker expression and tumor sub-type. CK7 and CK20 immunoreactivity were seen in 48% and 8% of tumors, respectively, although never in a diffuse pattern. CK20 expression was nearly exclusive to corticotrophs, whereas CK7 frequently highlighted cells with dendritic-type morphology. The specificity of organ-related differentiation markers was 100% (monoclonal Napsin A, GCDFP-15 and TTF-1), 97% (HepPar1 and PAX-8), 90% (polyclonal Napsin A) and 72% (ER); no tumors demonstrated significant co-expression of these organ-related markers with either CK7 or CK20. The first major conclusion of this study is that CK7 staining in adenoma is more frequent than has been previously than has been previously described. CK7 immunoreactive cells often displayed a dendritic-type morphology, including within large macroadenomas, which raises the question as to whether these represent tumor cells with folliculo-stellate cell-type differentiation, as these also have dendritic cell-type morphology and express CK7 in non-neoplastic glands. The second major conclusion, which confirms earlier findings, is that CK20 staining is a very infrequent immunohistochemical finding in adenomas that is virtually limited to corticotrophs and thus is helpful in diagnostic confirmation of that sub-type. The final conclusion is in regard to those features that separate adenomas from sellar region metastases: adenomas do not demonstrate significant expression of TTF-1, monoclonal Napsin A, PAX-8, HepPar1 or GCDFP-15, nor do they exhibit diffuse expression of CK7 and CK20.
authors.affiliation: Department of Pathology and Genomic Medicine, Houston Methodist Hospital, Houston, Texas, USA.
authors.forename: Matthew D
authors.initials: MD
authors.lastname: Cykowski
authors.affiliation: Department of Pathology and Genomic Medicine, Houston Methodist Hospital, Houston, Texas, USA.|Houston Methodist Neurologic Institute, Houston Methodist Hospital, Houston, Texas, USA.
authors.forename: Hidehiro
authors.initials: H
authors.lastname: Takei
authors.affiliation: Department of Neurosurgery and Kenneth R Peak Brain and Pituitary Tumor Center, Houston Methodist Hospital, Houston, Texas, USA.|Houston Methodist Neurologic Institute, Houston Methodist Hospital, Houston, Texas, USA.
authors.forename: David S
authors.initials: DS
authors.lastname: Baskin
authors.affiliation: Department of Pathology and Genomic Medicine, Houston Methodist Hospital, Houston, Texas, USA.|Houston Methodist Neurologic Institute, Houston Methodist Hospital, Houston, Texas, USA.
authors.forename: Andreana L
authors.initials: AL
authors.lastname: Rivera
authors.affiliation: Department of Pathology and Genomic Medicine, Houston Methodist Hospital, Houston, Texas, USA.|Houston Methodist Neurologic Institute, Houston Methodist Hospital, Houston, Texas, USA.
authors.forename: Suzanne Z
authors.initials: SZ
authors.lastname: Powell
mesh_terms: D000293:Adolescent; D000328:Adult; D000368:Aged; D000951:Antigens, Neoplasm / Q000378:metabolism; D016282:Aspartic Acid Endopeptidases / Q000378:metabolism; D014408:Biomarkers, Tumor / Q000378:metabolism*; D002352:Carrier Proteins / Q000378:metabolism; D002454:Cell Differentiation; D005260:Female; D006023:Glycoproteins / Q000378:metabolism; D006801:Humans; D053554:Keratin-20 / Q000378:metabolism; D053552:Keratin-7 / Q000378:metabolism; D008297:Male; D026901:Membrane Transport Proteins; D008875:Middle Aged; D009687:Nuclear Proteins / Q000378:metabolism; D000072636:PAX8 Transcription Factor / Q000378:metabolism; D010911:Pituitary Neoplasms / Q000378:metabolism* / Q000473:pathology; D011960:Receptors, Estrogen / Q000378:metabolism; D000074482:Thyroid Nuclear Factor 1; D014157:Transcription Factors / Q000378:metabolism; D055815:Young Adult
chemical_list: D000951:Antigens, Neoplasm; D014408:Biomarkers, Tumor; D002352:Carrier Proteins; D006023:Glycoproteins; C000600022:HepPar-1 protein, human; D053554:Keratin-20; D053552:Keratin-7; D026901:Membrane Transport Proteins; C000614412:NKX2-1 protein, human; D009687:Nuclear Proteins; D000072636:PAX8 Transcription Factor; C083325:PAX8 protein, human; C488892:PIP protein, human; D011960:Receptors, Estrogen; D000074482:Thyroid Nuclear Factor 1; D014157:Transcription Factors; D016282:Aspartic Acid Endopeptidases; C498549:NAPSA protein, human
keywords: immunohistochemistry; macroadenoma; metastasis; pituitary; sella