title: The role of nucleolar organiser regions as prognostic factors in breast cancer.
abstract: Nucleolar organiser regions (NORs) were stained in paraffin-embedded biopsy specimens of 80 female breast carcinomas by the silver (Ag) technique. The patients were prospectively followed up for a mean of 12.4 years (range 11.5-13.3). The number of different types of Ag-NORs was correlated with the histological grade, clinical stage, DNA ploidy, S-phase fraction (SPF) and clinical outcome. Grade III tumours showed higher Ag-NOR counts than low grade tumours. The total number of Ag-NORs (P = 0.0059) and the number of dispersed Ag-NOR (P = 0.0199) were significantly related to DNA ploidy aneuploid tumours showing higher Ag-NOR counts. The number of aggregated Ag-NORs was predictive (P = 0.0413) for the development of metastatic disease during follow-up. On the other hand, crude, cancer-related or recurrence-free survival could not be predicted significantly by the Ag-NORs. The results suggest that the number of Ag-NORs is clearly related to the proliferative activity in breast cancer, but the prognostic value of Ag-NOR counting is inferior to the previously recognised prognostic factors.
authors.affiliation: Department of Surgery, Kuopio University Central Hospital, Finland.
authors.forename: M J
authors.initials: MJ
authors.lastname: Eskelinen
authors.forename: P K
authors.initials: PK
authors.lastname: Lipponen
authors.forename: Y
authors.initials: Y
authors.lastname: Collan
authors.forename: K J
authors.initials: KJ
authors.lastname: Syrjänen
mesh_terms: D001943:Breast Neoplasms / Q000235:genetics* / Q000648:ultrastructure; D004273:DNA, Neoplasm / Q000032:analysis; D005260:Female; D006801:Humans; D008875:Middle Aged; D009697:Nucleolus Organizer Region / Q000648:ultrastructure*; D011379:Prognosis; D011446:Prospective Studies; D016196:S Phase; D013997:Time Factors
chemical_list: D004273:DNA, Neoplasm