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Illumina HT-12 v4 expression array data for Ovarian Cancer Samples

ABSTRACT: This study aimed to generate a new panel of comprehensively, genomically characterized high-grade serous ovarian carcinoma (HGSOC) cell line and xenograft models. Multidimensional genomic data were generated and compared between cell lines/xenografts and the tumours they were derived from, indicating the cell lines/xenografts are highly similar to their patient-matched tumours. Cell line/xenograft data were also compared to TCGA ovarian tumours to show the cell lines are good models of clinical HGSOC. Illumina HT-12 v4 arrays were performed according to the manufacturer's directions on total RNA extracted from i) tumour cells purified from ovarian tumour ascites, and ii) established cell lines. Evaluation of the similarity in copy number/methylation/gene expression/mutational profiles of cell lines/tumours/xenografts was performed.

ORGANISM(S): Homo sapiens

SUBMITTER: Kelsie Thu

PROVIDER: E-GEOD-71524 | biostudies-arrayexpress |

REPOSITORIES: biostudies-arrayexpress

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Affymetrix SNP array data for Ovarian Cancer Samples

Project description:This study aimed to generate a new panel of comprehensively, genomically characterized high-grade serous ovarian carcinoma (HGSOC) cell line and xenograft models. Multidimensional genomic data were generated and compared between cell lines/xenografts and the tumours they were derived from, indicating the cell lines/xenografts are highly similar to their patient-matched tumours. Cell line/xenograft data were also compared to TCGA ovarian tumours to show the cell lines are good models of clinical HGSOC. Affymetrix SNP 6 arrays were performed according to the manufacturer's instructions on genomic DNA extracted from i) tumour cells purified from ovarian tumour ascites, ii) established cell lines, iii) patient derived xenografts, and iv) lymphoblast lines. Evaluation of the similarity in copy number/methylation/gene expression/mutational profiles of cell lines/tumours/xenografts was performed.

2016-08-11 | E-GEOD-71522 | biostudies-arrayexpress

Illumina HumanMethylation450 array data for Ovarian Cancer Samples

Project description:This study aimed to generate a new panel of comprehensively, genomically characterized high-grade serous ovarian carcinoma (HGSOC) cell line and xenograft models. Multidimensional genomic data were generated and compared between cell lines/xenografts and the tumours they were derived from, indicating the cell lines/xenografts are highly similar to their patient-matched tumours. Cell line/xenograft data were also compared to TCGA ovarian tumours to show the cell lines are good models of clinical HGSOC. Illumina HumanMethylation450 arrays were performed according to the manufacturer's directions on DNA extracted from i) tumour cells purified from ovarian tumour ascites, and ii) established cell lines. Evaluation of the similarity in copy number/methylation/gene expression/mutational profiles of cell lines/tumours/xenografts was performed.

2016-08-11 | E-GEOD-71523 | biostudies-arrayexpress

Illumina HT-12 v4 expression array data for Ovarian Cancer Samples

2016-08-11 | GSE71524 | GEO

Illumina HumanMethylation450 array data for Ovarian Cancer Samples

2016-08-11 | GSE71523 | GEO

Affymetrix SNP array data for Ovarian Cancer Samples

2016-08-11 | GSE71522 | GEO

TP53 mutational status is a potential marker for risk stratification in Wilms tumour with diffuse anaplasia [expression]

Project description:The presence of diffuse anaplasia in Wilms tumours (DAWT) is associated with TP53 mutations and poor outcome. As patients receive intensified treatment, we sought to identify whether TP53 mutational status confers additional prognostic information. We studied 40 patients with DAWT with anaplasia in the tissue from which DNA was extracted and analysed for TP53 mutations and 17p loss. The majority of cases were profiled by copy number (n=32) and gene expression (n=36) arrays. TP53 mutational status was correlated with patient event-free and overall survival, genomic copy number instability and gene expression profiling. From the 40 cases, 22 (55%) had TP53 mutations (2 detected only after deep-sequencing), 20 of which also had 17p loss (91%); 18 (45%) cases had no detectable mutation but three had 17p loss. Tumours with TP53 mutations and/or 17p loss (n=25) had an increased risk of recurrence as a first event (p=0.03, hazard ratio (HR), 3.89; 95% confidence interval (CI), 1.26-16.0) and death (p=0.04, HR, 4.95; 95% CI, 1.36-31.7) compared to tumours lacking TP53 abnormalities. DAWT carrying TP53 mutations showed increased copy number alterations compared to those with wild-type, suggesting a more unstable genome (p=0.03). These tumours showed deregulation of genes associated with cell cycle and DNA repair biological processes. This study provides evidence that TP53 mutational analysis improves risk stratification in DAWT. This requires validation in an independent cohort before clinical use as a biomarker. 36 tumour samples were expression profiled in 2-colour hybridisations with Stratagene Universal Human Reference RNA in the reference channel. There were no replicates.

2014-08-30 | E-GEOD-60850 | biostudies-arrayexpress

Epigenetic regulation of the homeobox gene MSX1 associates with platinum resistant disease in high grade serous epithelial ovarian cancer

Project description:Introduction: Although High Grade Serous Ovarian Cancer (HGSOC) is considered a chemo-responsive disease, a proportion of patients do not respond to platinum-based chemotherapy at presentation or have progression-free survival of <6 months. Validated biomarkers of lack of response would enable alternative treatment stratification for these patients and identify novel mechanisms of resistance. Methods: Differential DNA methylation was investigated in independent tumour sets using Illumina 27K HumanMethylation arrays and validated by bisulphite pyrosequencing. Gene expression was by Affymetrix arrays and qRT-PCR. The role of Msh homeobox 1 (MSX1) in drug sensitivity was investigated by gene reintroduction into ovarian cancer cell lines. Results: CpG sites at contiguous genomic locations within the MSX1 gene have significantly lower levels of methylation in HGSOC which recur by 6 months compared to after 12 months and/or with RECIST response (p<0.05, q<0.05). A decrease in methylation at these intragenic CpG sites was significantly correlated with decreased MSX1 gene expression. Low expression of MSX1 was associated with poor progression-free survival independent of known clinical prognostic features (p=0.014). Three mutant or wild-type TP53 expressing ovarian cancer cell lines, resistant to cisplatin, have reduced MSX1 expression compared to matched parental, platinum sensitive, lines. Re-expression of MSX1 in resistant lines led to cisplatin sensitisation, increased apoptosis, increased p21 and BAX expression. However, in two TP53-null cell lines, MSX1 failed to change cisplatin sensitivity. Conclusion: Hypomethylation of MSX1 is a biomarker of resistant HGSOC disease at presentation and identifies a novel mechanism of platinum drug resistance. Bisulphite converted DNA from the 86 samples were hybridised to the Illumina Infinium 27k Human Methylation Beadchip v1.2

2015-11-26 | E-GEOD-75414 | biostudies-arrayexpress

Sequential azacitidine and carboplatin can prime high-grade serous ovarian cancer to respond to checkpoint inhibitor immunotherapy.

Project description:Platinum chemoresistance results in disease recurrence in patients with high-grade serous ovarian cancer (HGSOC). Recent advances in the treatment of solid tumours using checkpoint inhibitor immunotherapy has not benefited platinum-resistant HGSOC. Epigenetic silencing of genes involved in triggering cell death and apoptosis in HGSOC is known to occur via hypermethylation during development of platinum resistance. DNA methyltransferase (DNMT) inhibitors block methylation from occurring and allow silenced genes to be expressed. In ovarian cancer, DNMT inhibitors alter the epigenome and transcriptome of the tumours, which primarily affected expression of immune reactivation pathways. We aimed to determine the epigenome and transcriptome response to sequential treatment of HGSOC cells with DNMTi followed by standard-of-care carboplatin.

2022-02-02 | GSE169617 | GEO

Sequential azacitidine and carboplatin can prime high-grade serous ovarian cancer to respond to checkpoint inhibitor immunotherapy

2022-02-02 | GSE168225 | GEO

Identification of MRCKA as an integral component of ovarian cancer signaling and a therapeutic target

Project description:High-grade serous ovarian carcinoma (HGSOC) is the most lethal gynecological cancer with few effective targeted therapies. HGSOC tumors exhibit genomic instability with frequent alterations in the protein kinome; however, only a small fraction of the kinome has been therapeutically targeted in HGSOC. Using multiplexed inhibitor beads and mass spectrometry (MIB-MS), we mapped the kinome landscape of HGSOC patient tumors and tumors isolated from HGSOC patient-derived xenograft (PDX) models. Kinome profiling of HGSOC tumors uncovered a prevalent MIB-MS kinome signature consisting of established HGSOC driver kinases, as well as several kinases previously unexplored in HGSOC. Loss-of-function analysis targeting the tumor kinome signature in HGSOC cells nominated CDC42BPA (also known as MRCKA) as a putative therapeutic target. Characterization of MRCKA knockdown in established HGSOC cell lines demonstrated MRCKA was integral to signaling that regulated the cell cycle checkpoint and focal adhesion/ actin remodeling, and depletion of MRCKA impaired cell migration, proliferation and survival. Moreover, small molecule inhibition of MRCKA using BDP9066 inhibited cell growth and induced apoptosis in HGSOC cells, as well as blocked spheroid formation, supporting MRCKA as a novel therapeutic target for the treatment of HGSOC.

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