title: [Mutation and expression of tumor suppressor gene phosphatase and tensin homolog deleted in chromosome 10 in oral squamous cell carcinoma].
abstract: OBJECTIVE
  To investigate the role of mutation and mRNA expression of tumor suppressor gene phosphatase and tensin homolog deleted in chromosome 10 (PTEN) in tumorigenesis and progression of oral squamous cell carcinoma (OSCC).
  
  
  METHODS
  The mutation of exon 3, 5, 6 and exon 8 of PTEN gene in 42 oral squamous cell carcinoma tissue and paired normal tissue were detected by polymerase chain reaction (PCR) and DNA sequencing methods. The levels of PTEN mRNA expression in these tissues were assayed using semi-quantitative RT-PCR. Data was analyzed with SPSS 14.0 software package.
  
  
  RESULTS
  Mutated exon 5 of PTEN gene was found in 2 cases of advanced OSCC. The expression of PTEN mRNA was detected in all OSCC and paired normal tissue. The level of PTEN mRNA in OSCC tissue (0.36 +/- 0.12) was significantly lower than that of paired normal tissue (0.64 +/- 0.09, P < 0.01).
  
  
  CONCLUSIONS
  The decreased expression of PTEN mRNA contributes to tumorigenesis of OSCC.
authors.affiliation: Department of Stomatology, Chinese Academy of Medical Sciences, Peking Union Medical College, Beijing 100730, China.
authors.forename: Qian
authors.initials: Q
authors.lastname: Li
authors.forename: Ji-zhi
authors.initials: JZ
authors.lastname: Zhao
authors.forename: Yong-ning
authors.initials: YN
authors.lastname: Chen
authors.forename: Tao
authors.initials: T
authors.lastname: Zhang
authors.forename: Lian
authors.initials: L
authors.lastname: Zhou
authors.forename: Ye
authors.initials: Y
authors.lastname: Jin
mesh_terms: D002294:Carcinoma, Squamous Cell / Q000235:genetics*; D002879:Chromosomes, Human, Pair 10; D005091:Exons; D015870:Gene Expression; D016147:Genes, Tumor Suppressor; D006801:Humans; D008840:Microfilament Proteins; D009062:Mouth Neoplasms / Q000235:genetics*; D009154:Mutation; D051059:PTEN Phosphohydrolase / Q000235:genetics*; D010744:Phosphoric Monoester Hydrolases / Q000235:genetics*; D016133:Polymerase Chain Reaction; D012333:RNA, Messenger / Q000378:metabolism; D000070876:Tensins
chemical_list: D008840:Microfilament Proteins; D012333:RNA, Messenger; D000070876:Tensins; D010744:Phosphoric Monoester Hydrolases; D051059:PTEN Phosphohydrolase; C494929:PTEN protein, human