title: [Flow cytometric detection and significance of four cyclins in esophageal cancer].
abstract: OBJECTIVE
  To study the expression and significance of cyclin E, cyclin D1, CDK4 and p27 protein in esophageal squamous cell cancer (ESCC) and their correlation with tumor differentiation and lymph node metastasis.
  
  
  METHODS
  Expressions of cyclin E, cyclin D1, CDK4 and p27 protein in 65 patients with ESCC were quantitatively detected by flow cytometry.
  
  
  RESULTS
  The expressions of cyclin E, cyclin D1, CDK4 in poorly-differentiated ESCC were higher than those in well-differentiated ESCC (P = 0.0275, 0.0001, 0.0174). The expression of p27 in poorly-differentiated ESCC was lower than that in well-differentiated ESCC (P = 0.0042). There was positive correlation between cyclin E and cyclin D1, cyclin D1 and CDK4, but negative correlation between cyclin D1 and p27. The expressions of all four proteins were not correlated with lymph node metastasis.
  
  
  CONCLUSIONS
  The expressions of cyclin E, cyclin D1, CDK4 and p27 are closely related to tumor differentiation of ESCC. An imbalance between positive and negative control of cell cycling might be critical in the carcinogenesis of esophageal squamous cell cancer.
authors.affiliation: Department of Pathology, the Fouth Affiliated Hospital, Hebei Medical University, Shijiazhuang 050011, China.
authors.forename: Yun
authors.initials: Y
authors.lastname: Du
authors.forename: Xiao-ling
authors.initials: XL
authors.lastname: Wang
authors.forename: Guo-xiang
authors.initials: GX
authors.lastname: Wu
authors.forename: Yong-jun
authors.initials: YJ
authors.lastname: Wang
authors.forename: Hui-chai
authors.initials: HC
authors.lastname: Yang
authors.forename: Lian-fu
authors.initials: LF
authors.lastname: Zuo
mesh_terms: D000328:Adult; D000368:Aged; D002294:Carcinoma, Squamous Cell / Q000378:metabolism* / Q000556:secondary; D002454:Cell Differentiation; D019938:Cyclin D1 / Q000378:metabolism; D019927:Cyclin E / Q000378:metabolism; D051358:Cyclin-Dependent Kinase 4 / Q000378:metabolism; D050760:Cyclin-Dependent Kinase Inhibitor p27 / Q000378:metabolism; D016213:Cyclins / Q000378:metabolism*; D004938:Esophageal Neoplasms / Q000378:metabolism* / Q000473:pathology; D005260:Female; D005434:Flow Cytometry; D006801:Humans; D008198:Lymph Nodes / Q000473:pathology*; D008207:Lymphatic Metastasis; D008297:Male; D008875:Middle Aged
chemical_list: D019927:Cyclin E; D016213:Cyclins; D019938:Cyclin D1; D050760:Cyclin-Dependent Kinase Inhibitor p27; D051358:Cyclin-Dependent Kinase 4