title: Loss of heterozygosity on 10q23.3 and mutation of tumor suppressor gene PTEN in gastric cancer and precancerous lesions.
abstract: OBJECTIVE
  To investigate the loss of heterozygosity (LOH) and mutation of tumor suppressor gene PTEN in gastric cancer and precancerous lesions.
  
  
  METHODS
  Thirty cases of normal gastric mucosa, advanced and early stage gastric cancer, intestinal metaplasia, atrophic gastritis, and atypical hyperplasia were analyzed for PTEN LOH and mutations within the entire coding region of PTEN gene by PCR-SSCP denaturing PAGE gel electrophoresis, and PTEN mutation was detected by PCR-SSCP sequencing followed by silver staining.
  
  
  RESULTS
  LOH rate found in respectively atrophic gastritis was 10% (3/30), intestinal metaplasia 10% (3/30), atypical hyperplasia 13.3% (4/30), early stage gastric cancer 20% (6/30), and advanced stage gastric cancer 33.3% (9/30), None of the precancerous lesions and early stage gastric cancer showed PTEN mutations, but 10% (3/30) of the advanced stage gastric cancers, which were all positive for LOH, showed PTEN mutation.
  
  
  CONCLUSIONS
  LOH of PTEN gene appears in precancerous lesions, and PTEN mutations are restricted to advanced gastric cancer, LOH and mutation of PTEN gene are closely related to the infiltration and metastasis of gastric cancer.
authors.affiliation: Department of Gastroenterology, First Hospital of China Medical University, Shenyang 110001, Liaoning Province, China.
authors.forename: Yi-Ling
authors.initials: YL
authors.lastname: Li
authors.forename: Zhong
authors.initials: Z
authors.lastname: Tian
authors.forename: Dong-Ying
authors.initials: DY
authors.lastname: Wu
authors.forename: Bao-Yu
authors.initials: BY
authors.lastname: Fu
authors.forename: Yan
authors.initials: Y
authors.lastname: Xin
mesh_terms: D001483:Base Sequence; D002874:Chromosome Mapping; D002879:Chromosomes, Human, Pair 10; D017931:DNA Primers; D005091:Exons / Q000235:genetics; D005753:Gastric Mucosa / Q000502:physiology; D005819:Genetic Markers; D006801:Humans; D019656:Loss of Heterozygosity; D018895:Microsatellite Repeats; D009154:Mutation; D051059:PTEN Phosphohydrolase; D010744:Phosphoric Monoester Hydrolases / Q000235:genetics*; D018807:Polymorphism, Single-Stranded Conformational; D011230:Precancerous Conditions / Q000235:genetics* / Q000473:pathology; D013274:Stomach Neoplasms / Q000235:genetics* / Q000473:pathology; D025521:Tumor Suppressor Proteins / Q000235:genetics*
chemical_list: D017931:DNA Primers; D005819:Genetic Markers; D025521:Tumor Suppressor Proteins; D010744:Phosphoric Monoester Hydrolases; D051059:PTEN Phosphohydrolase; C494929:PTEN protein, human