title: [Detailed deletion mapping of chromosome 9p21-22 in nasopharyngeal carcinoma].
abstract: OBJECTIVE
  To further refine the extent of deletion on chromosome 9p21-22 in nasopharyngeal carcinoma(NPC) and provide evidence for discovering new tumor suppressor genes.
  
  
  METHODS
  Loss of heterozygosity (LOH) on chromosome 9p21-22 was analyzed in 25 paired blood and tumor samples by using 11 high-density microsatellite polymorphic markers.
  
  
  RESULTS
  Of the 25 cases, 17(68.0%) showed LOH at one or more loci. Higher frequencies of LOH were found at four loci: D9S161(35.0%), D9S1678(31.6%), D9S263 (33.3%) and D9S1853(33.3%). In 6 cases, contiguous stretch of allelic loss was found.
  
  
  CONCLUSIONS
  The minimal common region of deletion might be defined between D9S161 and D9S1853 (approximately 2.7 cM in length) at 9p21.1, suggesting that inactivation of one or more tumor suppressor genes located in this region may be an important step in NPC.
authors.affiliation: Cancer Research Institute, Hunan Medical University, Changsha 410078.
authors.forename: J
authors.initials: J
authors.lastname: Yang
authors.forename: X
authors.initials: X
authors.lastname: Tang
authors.forename: L
authors.initials: L
authors.lastname: Deng
mesh_terms: D002874:Chromosome Mapping; D002899:Chromosomes, Human, Pair 9; D016147:Genes, Tumor Suppressor; D006801:Humans; D019656:Loss of Heterozygosity; D009303:Nasopharyngeal Neoplasms / Q000235:genetics*