title: Clinical significance of cyclin B1 protein expression in squamous cell carcinoma of the tongue.
abstract: OBJECTIVE
  Cyclin B1 plays an important role in control of the G(2)-M transition of the cell cycle. We have shown recently that overexpression of cyclin B1 is associated with poor outcome in patients with early stage squamous cell carcinoma (SCC) of the lung.
  
  
  METHODS
  To determine the role of cyclin B1 in SCC of the tongue, we analyzed tumor specimens from 41 patients with stage II-IV SCC of the tongue who underwent curative surgery using immunohistochemistry.
  
  
  RESULTS
  The median follow-up of all patients was 83 months. Overexpression of cyclin B1 was observed in 15 (37%) of the 41 tumors, a similar frequency to that found in SCC of the lung. Patients whose tumors showed overexpression of cyclin B1 had a poor event-free survival compared with those lacking this feature (P = 0.04 by Log-rank test). Multivariate analysis of traditional clinical/pathological factors showed that cyclin B1 overexpression was an independent prognostic indicator.
  
  
  CONCLUSIONS
  Our study indicates that cyclin B1 is overexpressed in a subset of SCC of the tongue and is associated with a more aggressive biological behavior of the disease.
authors.affiliation: Department of Thoracic/Head and Neck Medical Oncology, The University of Texas M. D. Anderson Cancer Center, 1515 Holcombe Boulevard, Houston, TX 77030, USA.
authors.forename: K A
authors.initials: KA
authors.lastname: Hassan
authors.forename: A K
authors.initials: AK
authors.lastname: El-Naggar
authors.forename: J C
authors.initials: JC
authors.lastname: Soria
authors.forename: D
authors.initials: D
authors.lastname: Liu
authors.forename: W K
authors.initials: WK
authors.lastname: Hong
authors.forename: L
authors.initials: L
authors.lastname: Mao
mesh_terms: D002294:Carcinoma, Squamous Cell / Q000378:metabolism / Q000473:pathology*; D019926:Cyclin B / Q000096:biosynthesis*; D056744:Cyclin B1; D005260:Female; D006801:Humans; D007150:Immunohistochemistry; D008297:Male; D008875:Middle Aged; D016019:Survival Analysis; D014062:Tongue Neoplasms / Q000378:metabolism / Q000473:pathology*
chemical_list: C534699:CCNB1 protein, human; D019926:Cyclin B; D056744:Cyclin B1