title: CD97, but not its closely related EGF-TM7 family member EMR2, is expressed on gastric, pancreatic, and esophageal carcinomas.
abstract: CD97 expression is related closely to the dedifferentiation and tumor stage in thyroid carcinomas. We systematically examined the role of CD97 and its closest relative, EMR2, in normal and malignant gastric, esophageal, and pancreatic tissue. The normal tissues were EMR2-, whereas CD97 was expressed slightly in the parietal cells of gastric mucosa and in exocrine pancreatic cells. Interestingly, intralobular and interlobular pancreatic ducts were CD97+. All tumors were EMR2-. CD97 was expressed by 44 of 50 gastric, 14 of 18 pancreatic, and 10 of 13 esophageal carcinomas. Of the 44 gastric cancers, 27 showed disseminated or scattered tumor cells at the invasion front with stronger CD97 expression than tumor cells located in solid tumor formations. There was no correlation between CD97 levels in the tumors or soluble CD97 in the serum samples and the clinicopathologic features of the patients. Taken together, significant numbers of gastric, esophageal, and pancreatic carcinomas are CD97+, whereas its homolog, EMR2, does not have any role in such tumors.
authors.affiliation: Institute of Anatomy, University of Leipzig, Germany.
authors.forename: Gabriela
authors.initials: G
authors.lastname: Aust
authors.forename: Matthias
authors.initials: M
authors.lastname: Steinert
authors.forename: Alexander
authors.initials: A
authors.lastname: Schütz
authors.forename: Carsten
authors.initials: C
authors.lastname: Boltze
authors.forename: Mandy
authors.initials: M
authors.lastname: Wahlbuhl
authors.forename: Jörg
authors.initials: J
authors.lastname: Hamann
authors.forename: Manja
authors.initials: M
authors.lastname: Wobus
mesh_terms: D000368:Aged; D015703:Antigens, CD; D014408:Biomarkers, Tumor / Q000378:metabolism; D002277:Carcinoma / Q000378:metabolism* / Q000473:pathology; D004815:Epidermal Growth Factor / Q000235:genetics / Q000378:metabolism*; D004938:Esophageal Neoplasms / Q000378:metabolism* / Q000473:pathology; D005260:Female; D006801:Humans; D007150:Immunohistochemistry; D008297:Male; D008562:Membrane Glycoproteins / Q000235:genetics / Q000378:metabolism*; D008875:Middle Aged; D010190:Pancreatic Neoplasms / Q000378:metabolism* / Q000473:pathology; D012333:RNA, Messenger / Q000378:metabolism; D012334:RNA, Neoplasm / Q000032:analysis; D043562:Receptors, G-Protein-Coupled; D020133:Reverse Transcriptase Polymerase Chain Reaction; D013274:Stomach Neoplasms / Q000378:metabolism* / Q000473:pathology; D014407:Tumor Cells, Cultured
chemical_list: C412456:ADGRE2 protein, human; C095004:ADGRE5 protein, human; D015703:Antigens, CD; D014408:Biomarkers, Tumor; D008562:Membrane Glycoproteins; D012333:RNA, Messenger; D012334:RNA, Neoplasm; D043562:Receptors, G-Protein-Coupled; D004815:Epidermal Growth Factor