title: Gliomas: advances in molecular analysis and characterization.
abstract: BACKGROUND
  Gliomas represent the most common primary brain tumor. Despite recent advances in diagnostic imaging, neurosurgical technique, radiation therapy, and chemotherapy, significant advances in accurate prognosis and improved survival have not been achieved. Nevertheless, new developments in molecular biology could have potential impact on the clinical management of patients with these brain tumors. This review will describe the technological advances being used to enrich the classification of gliomas, present specific studies that have successfully used the new technologies to identify molecular subtypes of glioblastoma, and discuss the implications of such enhanced classification and molecular characterizations for the prediction of therapeutic response and the design of future brain tumor therapies.
  
  
  RESULTS
  Innovative techniques using complementary DNA and oligonucleotide microarrays (gene chips), tissue microarrays (tissue chips), and differential immunoabsorption have provided high throughput and potentially comprehensive approaches for the molecular characterization of human gliomas. Alterations of several tumor suppressor genes and oncogenes have already been identified as being critical to glioma transformation and progression. These approaches have led to the subclassification of glioblastoma multiforme into distinct subtypes based on the molecular signatures of the tumors.
  
  
  CONCLUSIONS
  Classifications of gliomas can now be enhanced with new techniques for comprehensive molecular characterization. Improved and efficient molecular profiling of brain tumors is advancing diagnosis/prognosis and identifying targets for novel and rational therapeutic approaches. Neurosurgeons and neuro-oncologists should be aware of these new developments so they can better advise and treat their patients.
authors.affiliation: Division of Neurosurgery, Brain Research Institute, Geffen School of Medicine at UCLA, University of California-Los Angeles, 10833 Le Conte Avenue, Los Angeles, CA 90095, USA.
authors.forename: Christine R
authors.initials: CR
authors.lastname: Boudreau
authors.forename: Isaac
authors.initials: I
authors.lastname: Yang
authors.forename: Linda M
authors.initials: LM
authors.lastname: Liau
mesh_terms: D014408:Biomarkers, Tumor / Q000235:genetics*; D001932:Brain Neoplasms / Q000145:classification / Q000175:diagnosis* / Q000235:genetics; D020869:Gene Expression Profiling / Q000379:methods / Q000639:trends; D015972:Gene Expression Regulation, Neoplastic / Q000235:genetics; D005819:Genetic Markers / Q000235:genetics*; D005910:Glioma / Q000145:classification / Q000175:diagnosis* / Q000235:genetics; D006801:Humans; D008495:Medical Oncology / Q000379:methods / Q000639:trends; D008967:Molecular Biology / Q000379:methods / Q000639:trends; D020411:Oligonucleotide Array Sequence Analysis / Q000379:methods / Q000639:trends
chemical_list: D014408:Biomarkers, Tumor; D005819:Genetic Markers