title: [Expression of isocitrate dehydrogenase 1 gene R132H and its diagnostic application in glioma].
abstract: OBJECTIVE
  To investigate the immunohistochemical expression of isocitrate dehydrogenase 1 gene (IDH1) R132H in glioma and its diagnostic utility.
  
  
  METHODS
  Immunohistochemical study of IDH1R132H expression was performed on formalin-fixed paraffin-embedded tissue samples of 75 gliomas, including 33 cases of grade II, 20 cases of grade III and 22 cases of grade IV tumors. Six cases of pilocytic astrocytoma and 12 cases of gliosis were used as controls.
  
  
  RESULTS
  Nineteen in 33 cases of grade II (57.6%), 8 in 20 cases of grade III (40.0%), 6 in 22 cases of grade IV (27.3%) showed positive cytoplasmic staining of IDH1R132H. Scattered invasive glioma cells at the tumor periphery also expressed IDH1R132H. Gliomas involving the frontal lobe showed more strong IDH1R132H staining. In contrast, none of the pilocytic astrocytomas and gliosis showed IDH1R132H staining. Moreover, the rate of p53 immunopositivities were 42.4% (14/33) in grade II, 65.0% (13/20) in grade III and 77.3% (17/22) in grade IV gliomas. There were no statistic correlations between expression of IDH1R132H and p53.
  
  
  CONCLUSIONS
  IDH1R132H tends to express preferentially in low-grade gliomas, and it thus may serve as a valuable marker in distinguishing low grade gliomas from gliosis.
authors.affiliation: Department of Pathology, Xuanwu Hospital, Capital Medical University, Beijing 100053, China. yspiao2002@yahoo.com.cn
authors.forename: Yue-shan
authors.initials: YS
authors.lastname: PIAO
authors.forename: De-hong
authors.initials: DH
authors.lastname: LU
authors.forename: Xiao-juan
authors.initials: XJ
authors.lastname: ZHANG
authors.forename: Guo-cai
authors.initials: GC
authors.lastname: TANG
authors.forename: Hong
authors.initials: H
authors.lastname: YANG
mesh_terms: D000293:Adolescent; D000328:Adult; D000368:Aged; D001254:Astrocytoma / Q000378:metabolism / Q000473:pathology; D001932:Brain Neoplasms / Q000378:metabolism* / Q000473:pathology*; D002648:Child; D003937:Diagnosis, Differential; D005260:Female; D005910:Glioma / Q000378:metabolism* / Q000473:pathology*; D005911:Gliosis / Q000378:metabolism / Q000473:pathology; D006801:Humans; D007521:Isocitrate Dehydrogenase / Q000235:genetics / Q000378:metabolism*; D008297:Male; D008875:Middle Aged; D009154:Mutation; D016159:Tumor Suppressor Protein p53 / Q000378:metabolism; D055815:Young Adult
chemical_list: D016159:Tumor Suppressor Protein p53; D007521:Isocitrate Dehydrogenase; C543588:IDH1 protein, human