title: Evidence for loss of heterozygosity (LOH) at chromosomes 9p and 17p in oral granular cell tumors: a pilot study.
abstract: OBJECTIVE
  The objective of this study was to assess loss of heterozygosity (LOH) in tumor suppressor gene loci in oral granular cell tumors (GCTs).
  
  
  METHODS
  We assessed LOH in 8 samples of oral GCT using polymorphic microsatellite markers at chromosome regions 3p, 9p, 11q, and 17p, flanking areas close to tumor suppressor genes. We further performed immunohistochemistry to detect the p53 and Ki-67 proteins and associated these expressions with the molecular results.
  
  
  RESULTS
  Five samples showed LOH in 3 markers at chromosomes 9p and 17p (markers P53, AFM238WF2 and D9S162) with fraction of allelic loss of 42.8% for each of these markers. No LOH was identified in any other chromosome. LOH was not associated with the immunohistochemical expression of p53 and Ki-67.
  
  
  CONCLUSIONS
  The present study shows LOH at chromosomes 9p and 17p in oral GCTs.
authors: Department of Pathology, Biological Sciences Institute, Universidade Federal de Minas Gerais, Belo Horizonte, Brazil.
authors: Carolina Cavaliéri
authors: CC
authors: Gomes
authors: Thiago
authors: T
authors: Fonseca-Silva
authors: Ricardo Santiago
authors: RS
authors: Gomez
mesh_terms: D000293:Adolescent; D000328:Adult; D002648:Child; D002874:Chromosome Mapping; D002886:Chromosomes, Human, Pair 17; D002899:Chromosomes, Human, Pair 9; D005260:Female; D016147:Genes, Tumor Suppressor; D016586:Granular Cell Tumor / Q000235:genetics*; D006801:Humans; D007150:Immunohistochemistry; D019656:Loss of Heterozygosity; D008297:Male; D018895:Microsatellite Repeats; D008875:Middle Aged; D009062:Mouth Neoplasms / Q000235:genetics*; D010865:Pilot Projects