title: Correlation between the prognostic value and the expression of the stem cell marker CD133 and isocitrate dehydrogenase1 in glioblastomas.
abstract: Cancer stem cells are thought to be responsible for tumor recurrence and resistance in glioblastomas. An isocitrate dehydrogenase1 (IDH1) mutation, affecting codon132 of the isocitrate dehydrogenase1 gene, has prognostic significance in glioblastomas. We investigated whether stem cell marker expression [CD133, CD34, and vascular endothelial growth factor (VEGF)] and IDH1 mutation correlate with clinical factors and prognosis in glioblastoma. CD133, CD34, and VEGF expression was evaluated by immunohistochemistry in 67 cases of glioblastoma identified between 2005 and 2012. IDH1 mutation was assessed by immunohistochemistry, peptide-nucleic-acid mediated PCR clamping, and direct gene sequencing. Diffuse CD133 expression was detected in 12 (17.9 %) cases and was associated with poor overall survival (OS) (P = 0.010) and progression-free survival (P = 0.017). CD34 and VEGF expression were not associated with prognosis in these samples. IDH1 mutation was detected in ten (14.9 %) cases. Eight were clinically secondary tumors and two were primary tumors (P < 0.001); the mean age of the secondary tumor patients was significantly younger (P = 0.001, 41.20 vs. 59.14). IDH1-positive patients had longer OS than IDH1-negative patients (25.78 vs. 22.95 months), but this difference was not significant. In addition, IDH1 and CD34 expression showed a negative correlation (P = 0.024). Multivariate analysis showed that age, extent of surgery, and diffuse CD133 expression correlated with OS. CD133 may be a survival marker for glioblastoma. Further characterization of CD133, IDH1, and vascular markers in glioblastoma may help identify new therapeutic targets.
authors.affiliation: Department of Hospital Pathology, College of Medicine, The Catholic University of Korea, Seoul, Korea, shinjungha@gmail.com.
authors.forename: Jung Ha
authors.initials: JH
authors.lastname: Shin
authors.forename: Youn Soo
authors.initials: YS
authors.lastname: Lee
authors.forename: Yong-Kil
authors.initials: YK
authors.lastname: Hong
authors.forename: Chang Suk
authors.initials: CS
authors.lastname: Kang
mesh_terms: D000071916:AC133 Antigen; D015703:Antigens, CD / Q000378:metabolism*; D014408:Biomarkers, Tumor / Q000032:analysis*; D001932:Brain Neoplasms / Q000235:genetics / Q000378:metabolism* / Q000401:mortality / Q000473:pathology; D005260:Female; D005500:Follow-Up Studies; D005909:Glioblastoma / Q000235:genetics / Q000378:metabolism* / Q000401:mortality / Q000473:pathology; D006023:Glycoproteins / Q000378:metabolism*; D006801:Humans; D007124:Immunoenzyme Techniques; D007521:Isocitrate Dehydrogenase / Q000235:genetics*; D008297:Male; D008875:Middle Aged; D009154:Mutation / Q000235:genetics*; D009367:Neoplasm Staging; D014411:Neoplastic Stem Cells / Q000378:metabolism* / Q000473:pathology; D010455:Peptides / Q000378:metabolism*; D016133:Polymerase Chain Reaction; D011379:Prognosis; D012189:Retrospective Studies; D015996:Survival Rate
chemical_list: D000071916:AC133 Antigen; D015703:Antigens, CD; D014408:Biomarkers, Tumor; D006023:Glycoproteins; C000606023:PROM1 protein, human; D010455:Peptides; D007521:Isocitrate Dehydrogenase; C543588:IDH1 protein, human