title: Identification of a new target region on the long arm of chromosome 7 in gastric carcinoma by loss of heterozygosity.
abstract: OBJECTIVE
  To define the common deleted region on the long arm of haman chromosome 7q linked to primary gastric carcinomas in Chinese by loss of heterozygosity (LOH) and its clinical significance.
  
  
  METHODS
  Nine microsatellite markers distributed over chromosome 7q with an average marker density of 10cM were used to examine 70 primary gastric carcinomas for LOH by PCR amplification. The PCR products were separated by electrophoresis on polyacrylamide gel. Genescan and Genotyper softwares were used to analyze LOH.
  
  
  RESULTS
  LOH with at least one marker on 7q occurred in 34.3% (12/50) of the tumors. Among them, LOH at D7S486 and D7S798 was higher in 24.0% (24/70) and 19.2% (5/26), respectively. By statistical analysis we also observed an obvious genotype-phenotype correlation on 7q (P<0.05). The frequency of LOH at D7S486 in patients with lymph node metastasis was significantly higher than that in those without lymph node metastasis (P=0.015).
  
  
  CONCLUSIONS
  The high incidence of LOH at D7S486 and its correlation with poorer prognosis suggest that there might be putative tumor suppressor genes in this region involved in the tumorigenesis and progression of gastric carcinoma.
authors: Research Section of Oncology, State Key Laboratory of Oncology in Southern China, Cancer Center, Zhongshan University, Guangzhou 510060, Guangdong Province, China.
authors: De-Sheng
authors: DS
authors: Weng
authors: Jin-Tian
authors: JT
authors: Li
authors: Shi-Juan
authors: SJ
authors: Mai
authors: Zhi-Zhong
authors: ZZ
authors: Pan
authors: Bing-Jian
authors: BJ
authors: Feng
authors: Qi-Sheng
authors: QS
authors: Feng
authors: Li-Xi
authors: LX
authors: Huang
authors: Qi-Jing
authors: QJ
authors: Wang
authors: Yong-Qiang
authors: YQ
authors: Li
authors: Xing-Juan
authors: XJ
authors: Yu
authors: Shi-Ping
authors: SP
authors: Chen
authors: Jia
authors: J
authors: He
authors: Jian-Chuan
authors: JC
authors: Xia