title: Expression and prognostic significance of cyclin B1 and cyclin A in non-small cell lung cancer.
abstract: OBJECTIVE
  Aberrant expression of cell cycle regulators has been implicated in the pathogenesis of many neoplasms, including non-small cell lung cancer (NSCLC). The aim was to examine the expression and prognostic value of cyclin B1 and cyclin A, key regulators of the G(2)/M checkpoint of the cell cycle, in NSCLC and bronchial precursor lesions.
  
  
  RESULTS
  Immunohistochemical expression of cyclin B1 and A was examined in 90 cases of stage I-II primary NSCLC and bronchial precursor lesions using tissue microarrays. Increased cyclin B1 and A expression was found in 40.9 and 58.9% of NSCLC cases, respectively, and was significantly higher in primary NSCLC, lymph node metastases and some bronchial precursor lesions compared with normal bronchial epithelium. Increased expression of cyclin A and cyclin B1 correlated with tumour type, poorly differentiated tumours and male gender. A significant association was found between increased cyclin B1 expression and reduced survival using Kaplan-Meier survival analysis. On multivariate analysis, cyclin B1 was not an independent prognostic factor (P = 0.067). Cyclin A expression was not associated with survival.
  
  
  CONCLUSIONS
  Cyclin B1 and cyclin A are aberrantly expressed in NSCLC and some precursor lesions. Cyclin B1, but not cyclin A, shows some promise as a potential prognostic marker in NSCLC.
authors.affiliation: Department of Anatomical Pathology, Royal Prince Alfred Hospital, Sydney, NSW, Australia. Wendy.Cooper@sswahs.nsw.gov.au
authors.forename: Wendy A
authors.initials: WA
authors.lastname: Cooper
authors.forename: Maija R J
authors.initials: MR
authors.lastname: Kohonen-Corish
authors.forename: Brian
authors.initials: B
authors.lastname: McCaughan
authors.forename: Catherine
authors.initials: C
authors.lastname: Kennedy
authors.forename: Robert L
authors.initials: RL
authors.lastname: Sutherland
authors.forename: Cheok Soon
authors.initials: CS
authors.lastname: Lee
mesh_terms: D000328:Adult; D000368:Aged; D014408:Biomarkers, Tumor / Q000378:metabolism*; D002289:Carcinoma, Non-Small-Cell Lung / Q000175:diagnosis* / Q000378:metabolism* / Q000473:pathology; D016022:Case-Control Studies; D002453:Cell Cycle; D019925:Cyclin A / Q000235:genetics / Q000378:metabolism*; D019926:Cyclin B / Q000235:genetics / Q000378:metabolism*; D056744:Cyclin B1; D005260:Female; D005500:Follow-Up Studies; D015972:Gene Expression Regulation, Neoplastic; D006801:Humans; D053208:Kaplan-Meier Estimate; D008175:Lung Neoplasms / Q000175:diagnosis* / Q000378:metabolism* / Q000473:pathology; D008207:Lymphatic Metastasis; D008297:Male; D008875:Middle Aged; D015999:Multivariate Analysis; D011230:Precancerous Conditions / Q000378:metabolism; D011379:Prognosis; D012044:Regression Analysis; D012189:Retrospective Studies
chemical_list: D014408:Biomarkers, Tumor; C534699:CCNB1 protein, human; D019925:Cyclin A; D019926:Cyclin B; D056744:Cyclin B1