title: [Expression of tumor suppressor gene PTEN, PIP3 and cyclin D1 in oral squamous cell carcinoma and their correlations].
abstract: OBJECTIVE
  To detect the expression of PTEN, PIP3 and cyclin D1 in oral squamous cell carcinoma and precancerous lesions and analyze their correlation.
  
  
  METHODS
  Immunohistochemistry SP method was used to detect the expression of PTEN, PIP3 and cyclin D1 in 63 cases of oral squamous cell carcinoma, 29 cases of simple hyperplasia, 33 cases of dysplasia, and 25 cases of normal oral mucosa.
  
  
  RESULTS
  The negative or low expression of PTEN in oral squamous cell carcinoma was 25%, which was remarkably lower than that in other groups. The positive expression of PIP3 in simple hyperplasia, dysplasia and oral squamous cell carcinoma was 66%, 64%, and 76% respectively, which were much higher than those in normal oral mucosa. The positive expression of cyclin D1 in oral squamous cell carcinoma was 49%, which was significantly higher than that in other groups. The negative correlation between PTEN with PIP3, cyclin D1 and the positive correlation between PIP3 and cyclin D1 were observed.
  
  
  CONCLUSIONS
  PTEN may play a role in the oncogenesis of oral squamous cell carcinoma, and PTEN may down-regulate the expression of PIP3, and then down-regulate the expression of cyclin D1, which leads to the suppression of cell growth.
authors.affiliation: Graduate College, Southern Medical University, Guangzhou 510515, China.
authors.forename: Si-ming
authors.initials: SM
authors.lastname: Xie
authors.forename: Li-jia
authors.initials: LJ
authors.lastname: Shen
authors.forename: Cao
authors.initials: C
authors.lastname: Yin
authors.forename: Ping
authors.initials: P
authors.lastname: Ruan
authors.forename: Xi
authors.initials: X
authors.lastname: Yao
mesh_terms: D002294:Carcinoma, Squamous Cell / Q000378:metabolism* / Q000473:pathology; D019938:Cyclin D1 / Q000378:metabolism*; D016147:Genes, Tumor Suppressor; D006801:Humans; D009062:Mouth Neoplasms / Q000378:metabolism* / Q000473:pathology; D051059:PTEN Phosphohydrolase / Q000378:metabolism*; D011230:Precancerous Conditions / Q000378:metabolism* / Q000473:pathology
chemical_list: D019938:Cyclin D1; D051059:PTEN Phosphohydrolase; C494929:PTEN protein, human