title: Epidermal growth factor receptor distribution in pericoronal follicles: relationship with the origin of odontogenic cysts and tumors.
abstract: OBJECTIVE
  Investigate the distribution of epidermal growth factor receptor (EGFR) in pericoronal follicles as a predictor of progression to odontogenic cysts and tumors.
  
  
  METHODS
  Immunohistochemical EGFR staining patterns (membrane-only, cytoplasm-only, or combined membrane and cytoplasmic staining) in the reduced enamel epithelium and nests of odontogenic epithelium associated with follicles of impacted molar teeth were evaluated. The staining pattern of 20 specimens of pericoronal follicle was compared with that of 16 normal oral mucosa samples and to squamous cell carcinoma samples.
  
  
  RESULTS
  Combined membrane and cytoplasmic staining was observed for normal oral mucosa mostly in proliferating layers (basal and suprabasal), decreasing in intensity toward the surface. Seven epithelial nests presented membrane-only staining, and the majority presented either a cytoplasm-only or a combined staining pattern. The staining patterns observed in reduced enamel epithelium were cytoplasm-only and combined.
  
  
  CONCLUSIONS
  EGFR membrane-only staining may be an indicator of increased potential for epithelial nests to become odontogenic cysts or tumors.
authors.affiliation: Graduate Program in Dentistry, Oral Pathology, Universidade Federal do Rio Grande do Sul, Porto Alegre, RS, Brazil. csbaumgart@yahoo.com.br
authors.forename: Cristina
authors.initials: C
authors.lastname: da Silva Baumgart
authors.forename: Isabel
authors.initials: I
authors.lastname: da Silva Lauxen
authors.forename: Manoel Sant'Anna
authors.initials: MS
authors.lastname: Filho
authors.forename: Onofre Francisco
authors.initials: OF
authors.lastname: de Quadros
mesh_terms: D000293:Adolescent; D000328:Adult; D016022:Case-Control Studies; D002462:Cell Membrane / Q000737:chemistry; D002471:Cell Transformation, Neoplastic; D003593:Cytoplasm / Q000737:chemistry; D003795:Dental Sac / Q000737:chemistry; D004847:Epithelial Cells / Q000737:chemistry; D066246:ErbB Receptors / Q000032:analysis*; D005260:Female; D006801:Humans; D008297:Male; D008964:Molar, Third; D009061:Mouth Mucosa / Q000166:cytology; D009807:Odontogenic Cysts / Q000209:etiology*; D009808:Odontogenic Tumors / Q000209:etiology*; D013194:Staining and Labeling / Q000379:methods; D018709:Statistics, Nonparametric; D019228:Tooth Crown; D014095:Tooth, Impacted / Q000150:complications*
chemical_list: D066246:ErbB Receptors