GEO DataSets

Analysis of 50 glial brain tumors of various histogenesis. Results provide insight into the molecular mechanisms underlying gliomagenesis and define biological pathway maps associated with gliomagenesis as well as distinct glioma subtypes.

Organism:

Homo sapiens

Type:

Expression profiling by array, log2 ratio, 6 disease state sets

Platform:

GPL1833

Series:

GSE2223

53 Samples

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(Submitter supplied) Gene expression profiling in 50 glial brain tumors and 4 normal brains using 42,000-feature cDNA microarrays (from total RNA). Tumors: 50 fresh-frozen glioma specimens subjected to standard WHO classification. Specimens included astrocytic [2 juvenile pilocytic astrocytomas, 1 low-grade astrocytic glioma, 1 anaplastic astrocytomas, 31 glioblastomas (of these 2 secondary glioblastomas and 2 gliosarcomas)], oligodendroglial [5 oligodendrogliomas, 3 anaplastic oligodendrogliomas], and 6 anaplastic oligoastrocytomas tumors. more...

Organism:

Homo sapiens

Type:

Expression profiling by array

Dataset:

GDS1813

Platform:

GPL1833

54 Samples

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(Submitter supplied) Combined model of in vitro and in vivo resistance to alkylating agents (BCNU and Temozolomide) in glioblastoma multiforme. Three matched pairs of surgical specimens from initial (DI, ME, LX) and repeat (DIR, MER, LXR) tumor resection were used to establish cell lines. Patients received BCNU chemotherapy between the two operations, which rendered the sublines from repeat surgery more resistant to BCNU than those from initial surgery. more...

Organism:

Homo sapiens

Type:

Expression profiling by array; Genome variation profiling by array

Dataset:

GDS1830

Platform:

GPL1831

30 Samples

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(Submitter supplied) Set of arrays organized by shared biological context, such as organism, tumors types, processes, etc. Characterization of DNA copy number changes in 54 glial brain tumors using a cDNA microarray-based comparative genomic hybridization method. Tumors: 54 fresh-frozen glioma specimens subjected to standard WHO classification. Specimens included astrocytic [3 juvenile pilocytic astrocytomas, 1 low-grade astrocytic glioma, 3 anaplastic astrocytomas, 31 glioblastomas (of these 3 secondary glioblastomas and 2 gliosarcomas)], oligodendroglial [5 oligodendrogliomas, 3 anaplastic oligodendrogliomas], and 7 anaplastic oligoastrocytomas tumors. more...

Organism:

Homo sapiens

Type:

Genome variation profiling by array

Platform:

GPL1715

54 Samples

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Expression analysis of cell lines derived from primary and recurrent glioblastomas with resistance to O6-alkylating agents, BCNU and TMZ. Chemoresistance to these widely-used drugs is a major obstacle to tumor treatment. Results identify a transcriptomic signature of resistance to alkylating agents.

Organism:

Homo sapiens

Type:

Expression profiling by array, log2 ratio, 4 cell line, 2 disease state sets

Platform:

GPL1831

Series:

GSE2221

15 Samples

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(Submitter supplied) Alkylating agents are a frontline therapy for the treatment of several cancers including pediatric glioblastoma, a devastating lethal tumor in children. Unfortunately, many tumors are resistant to this therapy. We sought to identify ways of sensitizing tumor cells to alkylating agents while leaving normal cells unharmed; increasing therapeutic response while minimizing toxicity. Here we report using a siRNA screen targeting over 240 DNA damage response genes identified novel sensitizers to alkylating agents. more...

Organism:

Homo sapiens

Type:

SNP genotyping by SNP array

Platform:

GPL3718

35 Samples

Download data: CEL, CHP, TXT

(Submitter supplied) Diffuse intrinsic pontine glioma (DIPG) is one of the most devastating of paediatric malignancies and one for which no effective therapy exists. A major contributor to the failure of therapeutic trials is the assumption that biologic properties of brainstem tumours in children are identical to cerebral high-grade gliomas of adults. A better understanding of the biology of DIPG itself is needed in order to develop agents targeted more specifically to these children’s disease. more...

Organism:

Homo sapiens

Type:

Genome variation profiling by SNP array; SNP genotyping by SNP array

Platforms:

GPL6801 GPL3718

18 Samples

Download data: CEL, CHP

(Submitter supplied) The outcome of patients with anaplastic gliomas varies considerably depending on histology and single molecular markers such as codeletion of 1p/19q and mutations of the isocitrate dehydrogenase (IDH) gene. Whether a molecularly-based classification of anaplastic gliomas based on large scale genomic or epigenomic analyses is superior to histopathology, may reflect distinct biological subtypes, predict outcome and guide therapy decisions had yet to be determined. more...

Organism:

Homo sapiens

Type:

Methylation profiling by genome tiling array

Platform:

GPL13534

228 Samples

Download data: TXT

(Submitter supplied) Affymetrix expression profiling was used to evaluate the association between IL13Rα2 expression, and mesenchymal, proneural, classical and neural signature genes expression for glioma subclasses defined by Verhaak et al (Cancer Cell; 2010).

Organism:

Homo sapiens

Type:

Expression profiling by array

Platform:

GPL570

26 Samples

Download data: CEL

(Submitter supplied) Expression profiling by Illumina gene expression microarrays

Organism:

Homo sapiens

Type:

Expression profiling by array

Platform:

GPL10558

24 Samples

Download data: TXT

(Submitter supplied) CpG island methylation profiling of anaplastic gliomas compared to healthy control. Goal was to identify anaplastic glioma-specific differentially methylated regions (DMRs).

Organism:

Homo sapiens

Type:

Methylation profiling by genome tiling array

Platform:

GPL4126

4 Samples

Download data: TXT

(Submitter supplied) Migrated from 1.6 id: 1015897590491013 GEDP id: 760 In current clinical practice, histology-based grading of diffuse infiltrative gliomas is the best predictor of patient survival time. Yet histology provides little insight into the underlying biology of gliomas and is limited in its ability to identify and guide new molecularly targeted therapies. We have performed large-scale gene expression analysis using the Affymetrix HG U133 oligonucleotide arrays on 85 diffuse infiltrating gliomas of all histologic types to assess whether a gene expression-based, histology-independent classifier is predictive of survival and to determine whether gene expression signatures provide insight into the biology of gliomas. more...

Organism:

Homo sapiens

Type:

Expression profiling by array

Platforms:

GPL97 GPL96

170 Samples

Download data: CEL, CHP, TXT

(Submitter supplied) Diffuse infiltrating gliomas are the most common primary brain malignancy found in adults, and Glioblastoma multiforme, the highest grade glioma, is associated with a median survival of 7 months. Transcriptional profiling has been applied to 85 gliomas from 74 patients to elucidate glioma biology, prognosticate survival, and define tumor sub-classes. These studies reveal that transcriptional profiling of gliomas is more accurate at predicting survival than traditional pathologic grading, and that gliomas characteristically express coordinately regulated genes of one of four molecular signatures: neurogenesis, synaptic transmission, mitotic, or extra-cellular matrix. more...

Organism:

Homo sapiens

Type:

Expression profiling by array

Datasets:

GDS1975 GDS1976

Platforms:

GPL97 GPL96

170 Samples

Download data: CEL, TXT

Analysis of grades III and IV gliomas of various histologic types. Results used to develop a gene-expression based, histology independent-classification scheme, and provide insight into the biology of gliomas.

Organism:

Homo sapiens

Type:

Expression profiling by array, count, 4 cell type, 2 disease state sets

Platform:

GPL97

Series:

GSE4412

85 Samples

Download data: CEL

Analysis of grades III and IV gliomas of various histologic types. Results used to develop a gene-expression based, histology independent-classification scheme, and provide insight into the biology of gliomas.

Organism:

Homo sapiens

Type:

Expression profiling by array, count, 4 cell type, 2 disease state sets

Platform:

GPL96

Series:

GSE4412

85 Samples

Download data: CEL

(Submitter supplied) We carried out the analyses of chromosome variations between low-grade and high-grade gliomas in Chinese population. We found out the differences in chromosomes, cytobands, genes, pathways and GO functions.

Organism:

Homo sapiens

Type:

Genome variation profiling by SNP array; SNP genotyping by SNP array

Platform:

GPL6985

36 Samples

Download data: TXT

(Submitter supplied) This SuperSeries is composed of the SubSeries listed below.

Organism:

Mus musculus

Type:

Expression profiling by array; Genome variation profiling by genome tiling array

Platforms:

GPL11202 GPL7202 GPL15076

172 Samples

Download data: TXT

(Submitter supplied) We used genetically-engineered mice (GEM) to target constitutive RTK effector pathway (KrasG12D and/or Pten deletion) mutations in G1/S checkpoint-defective adult mouse astrocytes. Genetic lineage tracing showed that these mutations potentiated tumor initiation in cortical, diencephalic, brainstem, and olfactory bulb astrocytes, producing low-grade astrocytomas (LGA). LGA lacked copy number abnormalities (CNA), but showed oncogenic driver- and astrocyte location-specific transcriptome profiles, suggesting that both driver mutations and cellular origin contribute to LGA genomic heterogeneity. more...

Organism:

Mus musculus

Type:

Genome variation profiling by genome tiling array

Platform:

GPL15076

41 Samples

Download data: TXT

(Submitter supplied) We used genetically-engineered mice (GEM) to target constitutive RTK effector pathway (KrasG12D and/or Pten deletion) mutations in G1/S checkpoint-defective adult mouse astrocytes. Genetic lineage tracing showed that these mutations potentiated tumor initiation in cortical, diencephalic, brainstem, and olfactory bulb astrocytes, producing low-grade astrocytomas (LGA). LGA lacked copy number abnormalities (CNA), but showed oncogenic driver- and astrocyte location-specific transcriptome profiles, suggesting that both driver mutations and cellular origin contribute to LGA genomic heterogeneity. more...

Organism:

Mus musculus

Type:

Genome variation profiling by genome tiling array

Platform:

GPL15076

10 Samples

Download data: TXT

(Submitter supplied) We used genetically-engineered mice (GEM) to target constitutive RTK effector pathway (KrasG12D and/or Pten deletion) mutations in G1/S checkpoint-defective adult mouse astrocytes. Genetic lineage tracing showed that these mutations potentiated tumor initiation in cortical, diencephalic, brainstem, and olfactory bulb astrocytes, producing low-grade astrocytomas (LGA). LGA lacked copy number abnormalities (CNA), but showed oncogenic driver- and astrocyte location-specific transcriptome profiles, suggesting that both driver mutations and cellular origin contribute to LGA genomic heterogeneity. more...

Organism:

Mus musculus

Type:

Expression profiling by array

Platform:

GPL11202

43 Samples

Download data: TXT