title: Nucleolar organizer regions in precancerous and cancerous lesions of the bronchus.
abstract: Using a silver staining technique, nucleolar organizer region-associated proteins (Ag-NOR) were studied in paraffin sections of five specimens of normal bronchial epithelium, eight of atypical squamous metaplasia, five of carcinoma in situ, and seven of microinvasive squamous cell carcinoma. The mean number of Ag-NOR in the nucleus were normal epithelium 1.2 +/- 0.1 (mean +/- SD), atypical squamous metaplasia (borderline lesion) 2.2 +/- 0.5, carcinoma in situ 3.8 +/- 0.6, and microinvasive squamous cell carcinoma 4.8 +/- 1.1. There was a highly significant difference between the Ag-NOR numbers in the atypical squamous metaplasia and those in the carcinoma in situ (P less than 0.01). The Ag-NOR staining is a useful technique for the differential diagnosis of difficult borderline lesions in the bronchial epithelium.
authors.affiliation: First Department of Medicine, School of Medicine, Hokkaido University, Sapporo, Japan.
authors.forename: S
authors.initials: S
authors.lastname: Abe
authors.forename: S
authors.initials: S
authors.lastname: Ogura
authors.forename: H
authors.initials: H
authors.lastname: Kunikane
authors.forename: N
authors.initials: N
authors.lastname: Suko
authors.forename: N
authors.initials: N
authors.lastname: Watanabe
authors.forename: I
authors.initials: I
authors.lastname: Nakajima
authors.forename: Y
authors.initials: Y
authors.lastname: Kawakami
authors.forename: K
authors.initials: K
authors.lastname: Inoue
mesh_terms: D001984:Bronchial Neoplasms / Q000473:pathology*; D002278:Carcinoma in Situ / Q000473:pathology; D002294:Carcinoma, Squamous Cell / Q000473:pathology; D006801:Humans; D009697:Nucleolus Organizer Region / Q000473:pathology*; D011230:Precancerous Conditions / Q000473:pathology*