title: Different keratin profiles in craniopharyngioma subtypes and ameloblastomas.
abstract: Craniopharyngiomas are generally considered to arise from the remnants of Rathke's pouch or a misplaced enamel organ. We tried to refine these hypotheses, comparing the subtypes of craniopharyngioma with Rathke's cleft cyst, a known Rathke's pouch derivative, and with ameloblastoma, an enamel organ derivative. Nineteen craniopharyngiomas (14 adamantinomatous and 5 papillary type tumors) and 17 ameloblastomas were immunostained for cytokeratin (CK) 7, CK 8, CK 14, and human hair keratin (HHK). All cases of adamantinomatous craniopharyngioma were CK 7+/CK 8+/CK 14+. Two cases (40%) of papillary craniopharyngioma were CK 7+/CK 8+/CK 14+, whereas the remaining three cases (60%) were CK 7+/CK 8-/CK 14+. Fifteen cases (88%) of ameloblastoma were CK 7-/CK 8+/CK 14+. Only the shadow cells present in adamantinomatous craniopharyngiomas were positive for HHK, which may indicate their follicular differentiation. In Rathke's cleft cyst, ciliated cuboidal cells were CK 7+/CK 8+/CK 14- and metaplastic squamous cells were CK 7+/CK 8/CK 14+. These findings suggest that both subtypes of craniopharyngioma may differ from ameloblastoma in histogenesis, although cytokeratin expression patterns may change during tumor development. Adamantinomatous craniopharyngioma may be related to a heterotopic ectodermal tissue which can differentiate into hair follicles, while papillary craniopharyngioma may arise from Rathke's cleft cyst.
authors.affiliation: Department of Pathology, Nagoya City University Medical School, Nagoya, Aichi, Japan. htate@med.nagoya-cu.ac.jp
authors.forename: H
authors.initials: H
authors.lastname: Tateyama
authors.forename: T
authors.initials: T
authors.lastname: Tada
authors.forename: M
authors.initials: M
authors.lastname: Okabe
authors.forename: E
authors.initials: E
authors.lastname: Takahashi
authors.forename: T
authors.initials: T
authors.lastname: Eimoto
mesh_terms: D000293:Adolescent; D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D000564:Ameloblastoma / Q000737:chemistry / Q000378:metabolism* / Q000473:pathology; D014408:Biomarkers, Tumor / Q000032:analysis; D003397:Craniopharyngioma / Q000737:chemistry / Q000378:metabolism* / Q000473:pathology; D005260:Female; D006801:Humans; D007124:Immunoenzyme Techniques; D007573:Jaw Neoplasms / Q000737:chemistry / Q000378:metabolism* / Q000473:pathology; D007633:Keratins / Q000032:analysis / Q000145:classification / Q000378:metabolism*; D008297:Male; D008875:Middle Aged; D009363:Neoplasm Proteins / Q000032:analysis; D010911:Pituitary Neoplasms / Q000737:chemistry / Q000378:metabolism* / Q000473:pathology; D012189:Retrospective Studies
chemical_list: D014408:Biomarkers, Tumor; D009363:Neoplasm Proteins; D007633:Keratins