GEO DataSets

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

Download data

(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

Download data

(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

Download data

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

Download data

(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:

GPL3718 GPL6801

18 Samples

Download data: CEL, CHP

(Submitter supplied) DNA methylation analysis of 68 glioblastoma specimen of patients treated within clinical trials, 5 samples of normal brain tissue (non-tumor brain) and 4 tumor-derived glioma sphere lines. The data was used to identify changes in DNA methylation which contribute to the aberrant of expression of HOX transcription factors. Our group had previously demonstrated that expression of HOX genes was associated with increased resistance to chemo-radiotherapy and worse outcome in GBM patients Keywords: Disease state comparison

Organism:

Homo sapiens

Type:

Methylation profiling by genome tiling array

Platform:

GPL13534

77 Samples

Download data: IDAT

(Submitter supplied) Analysis of 80 glioblastoma specimen of patients treated within clinical trials and 4 samples of "normal" brain tissue (non-tumoral). The data was used to identify factors of resistance to a chemoradiation therapy protocol of radiotherapy and concomitant and adjuvant temozolomide (alkylating agent). Keywords: Disease state comparison

Organism:

Homo sapiens

Type:

Expression profiling by array

Platform:

GPL570

84 Samples

Download data: CEL

(Submitter supplied) BACKGROUND: Prediction models for old-age mortality have generally relied upon conventional markers such as plasma-based factors and biophysiological characteristics. However, it is unknown whether the existing markers are able to provide the most relevant information in terms of old-age survival or whether predictions could be improved through the integration of whole-genome expression profiles. METHODS: We assessed the predictive abilities of survival models containing only conventional markers, only gene expression data or both types of data together in a Vitality 90+ study cohort consisting of n = 151 nonagenarians. more...

Organism:

Homo sapiens

Type:

Expression profiling by array

Platform:

GPL15988

151 Samples

Download data: TXT

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

Organism:

Homo sapiens

Type:

Expression profiling by array

Platform:

GPL15988

327 Samples

Download data