title: Immunohistochemical study of cytokeratin expression in nevus sebaceous.
abstract: BACKGROUND
  The histogenesis of nevus sebaceous (NS) is unclear.
  
  
  METHODS
  To elucidate the histogenesis of NS, cytokeratin (CK) profiles were examined immunohistochemically using 10 anti-keratin antibodies in the three stages of NS.
  
  
  RESULTS
  In the first stage, stratified differentiated keratins (CK1 and 10) were reduced, and basal keratin (CK14) was increased in the epidermis and primitive follicular structure (PFS). In the second stage, in addition to reduced CK1 and CK10 expressions and increased CK14 expression, CK17 expression was strongly expressed in the sebaceous ducts in proportion to the development of sebaceous gland. In the third stage, CK14, CK17 and CK19 were expressed in secondary tumors. CK16 was not detected throughout all stages of NS.
  
  
  CONCLUSIONS
  These results suggest that NS is not hyperproliferative but involves hamartomatous differentiation with undifferentiated keratins.
authors.affiliation: Department of Dermatology, Mie University Graduate School of Medicine, Mie, Japan. kuroichi@clin.medic.mie-u.ac.jp
authors.forename: Ichiro
authors.initials: I
authors.lastname: Kurokawa
authors.forename: Keisuke
authors.initials: K
authors.lastname: Nishimura
authors.forename: Kei-ichi
authors.initials: K
authors.lastname: Yamanaka
authors.forename: Ken-ichi
authors.initials: K
authors.lastname: Isoda
authors.forename: Yoshiki
authors.initials: Y
authors.lastname: Taniguchi
authors.forename: Daisuke
authors.initials: D
authors.lastname: Tsuruta
authors.forename: Airo
authors.initials: A
authors.lastname: Tsubura
authors.forename: Hitoshi
authors.initials: H
authors.lastname: Mizutani
mesh_terms: D000293:Adolescent; D000328:Adult; D002648:Child; D002675:Child, Preschool; D004817:Epidermis / Q000378:metabolism; D005260:Female; D006801:Humans; D007150:Immunohistochemistry; D053547:Keratin-14 / Q000378:metabolism; D053536:Keratin-16 / Q000378:metabolism; D053537:Keratin-17 / Q000378:metabolism; D007633:Keratins / Q000378:metabolism*; D008297:Male; D008875:Middle Aged; D054000:Nevus, Sebaceous of Jadassohn / Q000378:metabolism* / Q000473:pathology; D012627:Sebaceous Glands / Q000378:metabolism
chemical_list: D053547:Keratin-14; D053536:Keratin-16; D053537:Keratin-17; D007633:Keratins