title: [The relationship of p53 gene mutation to cell differentiation and metastasis of laryngeal squamous cell carcinoma].
abstract: OBJECTIVE
  To inquire about the relationship of p53 gene mutation to the histopathological findings and clinical manifestation in cases of laryngeal squamous cell carcinoma(LSCC).
  
  
  METHODS
  The fresh samples from 60 cases of LSCC were examined. Polymerase chain reaction and silver staining-single strand conformation polymorphism (PCR-SSCP) and DNA direct sequencing were used to detect the mutation of p53 gene in exons 5-8.
  
  
  RESULTS
  The mutation rates were 69.2% and 85.3% in patients at clinical stage I-II and stage III-IV respectively (P>0.05). In the well-, moderately- and poorly-differentiated cell of LSCC, the mutation rates were 52.9%, 83.3% and 94.7% respectively (P<0.05). The p53 gene mutation rate of LSCC patients with neck lymph-node metastasis was 96.4%, whereas that of patients without neck lymph-node metastasis was 62.5% (P<0.05). Twenty samples showed positive results in SSCP; 19 samples showed deletion and mutation in codons 125-292 by DNA direct sequencing.
  
  
  CONCLUSIONS
  The mutation of p53 gene in exons 5-8 was closely related to cell differentiation and the neck lymph-node metastasis of LSCC, but it was not related to the clinical stages of the LSCC cases.
authors.affiliation: Department of Otorhinolaryngology, the Fourth Affiliated Hospital, Sichuan University, Chengdu, Sichuan, 610041 P. R. China. iooi@263.net
authors.forename: Xiaoqing
authors.initials: X
authors.lastname: Zhang
authors.forename: Lihong
authors.initials: L
authors.lastname: Wang
authors.forename: Shixi
authors.initials: S
authors.lastname: Liu
authors.forename: Xuesong
authors.initials: X
authors.lastname: Ouyang
authors.forename: Chuanyu
authors.initials: C
authors.lastname: Liang
mesh_terms: D002294:Carcinoma, Squamous Cell / Q000235:genetics* / Q000556:secondary; D002454:Cell Differentiation / Q000235:genetics*; D005091:Exons; D006801:Humans; D007822:Laryngeal Neoplasms / Q000235:genetics* / Q000473:pathology; D008207:Lymphatic Metastasis / Q000235:genetics; D009154:Mutation; D009367:Neoplasm Staging; D016133:Polymerase Chain Reaction / Q000379:methods; D018807:Polymorphism, Single-Stranded Conformational; D017422:Sequence Analysis, DNA / Q000379:methods; D016159:Tumor Suppressor Protein p53 / Q000235:genetics*
chemical_list: D016159:Tumor Suppressor Protein p53