title: [Identification of some macrosatillite sites of chromosome 19 in primary gastric carcinoma with loss of heterozygosity].
abstract: OBJECTIVE
  To investigate the possible correlation between the microsatellite DNA instability(MSI) and loss of heterozygosity(LOH) on the short arm of chromosome 19(19p) and the clinical significance in patients with primary gastric carcinoma, and to explore the importance of MSI and LOH in primary gastric carcinoma.
  
  
  METHODS
  PCR-SSLP-silver stain method was used to detect 7 loci MSI and LOH in 79 primary gastric carcinomas and paired normal control tissues. The PCR products were separated by electrophoresis on polyacrylamide gel. Genescan and genotype softwares were used to analyze MSI and LOH.
  
  
  RESULTS
  LOH with at least one marker on 19p occurred in 31.18%(27/79)tumors. Among them, LOH at D19S591 and D19S565 was 60.32%(38/63)and 48.15%(26/54), respectively. The high incidence of LOH was related to depth of invasion and distant metastases of primary gastric carcinoma (P<0.05),and there was no significance between MSI and primary gastric carcinoma.
  
  
  CONCLUSIONS
  LOH is related to depth of invasion and distant metastases of primary gastric carcinoma.The high incidence of LOH suggests that there might be putative tumor gene in these LOH sites.
authors.affiliation: Department of Laboratory Tests, Seventh People's Hospital of Shenzhen, Guangdong Shenzhen 518081, China . jm196601@126.com
authors.forename: Ming
authors.initials: M
authors.lastname: Jiang
authors.forename: Long
authors.initials: L
authors.lastname: Xu
authors.forename: Yi
authors.initials: Y
authors.lastname: Zhao
authors.forename: Hong-hui
authors.initials: HH
authors.lastname: Fang
authors.forename: Zhao-hui
authors.initials: ZH
authors.lastname: Chen
authors.forename: Yuan
authors.initials: Y
authors.lastname: Gao
mesh_terms: D000230:Adenocarcinoma / Q000235:genetics; D000328:Adult; D000368:Aged; D002888:Chromosomes, Human, Pair 19 / Q000235:genetics*; D005260:Female; D042822:Genomic Instability; D006801:Humans; D019656:Loss of Heterozygosity; D008297:Male; D018895:Microsatellite Repeats / Q000235:genetics*; D008875:Middle Aged; D016133:Polymerase Chain Reaction / Q000379:methods; D013274:Stomach Neoplasms / Q000235:genetics*