Unknown,Transcriptomics,Genomics,Proteomics

Dataset Information

Mir-30e* is an independent subtype-specific prognostic marker in breast cancer

ABSTRACT: Both gene and miRNA expression patterns separately correlate with survival in breast cancer suggesting that the development of models using both miRNAs and gene markers might improve their prediction performance. In this study miRNAs significantly associated with development of distant metastasis were identified and further investigated and validated in the publicly available dataset from the METABRIC. A combined outcome prediction model using gene expression, miRNA expression and clinico-pathological features was implemented. Fresh-frozen primary tumors were obtained from 123 patients with operable breast cancer previously untreated, pathologically defined as axillary node-negative and undergoing radical or conservative surgery at the Istituto Nazionale Tumori of Milano (INTM) between1990 and 1998. Patients were selected in order to have a comparable pattern of classical risk factors (age, tumor size).

ORGANISM(S): Homo sapiens

SUBMITTER: Francesca D'Aiuto

PROVIDER: E-GEOD-59829 | biostudies-arrayexpress |

REPOSITORIES: biostudies-arrayexpress

ACCESS DATA

Similar Datasets

Project description:Deficiencies in the ATM gene are the underlying cause for ataxia telangiectasia, a congenital syndrome characterized by neurological, motor and immunological defects, as well as a predisposition to cancer risks. MicroRNAs (miRNAs) are small regulators of post-transcriptional gene expression and a useful tool for cancer diagnosis, staging, and prediction of therapeutic responses to clinical regimens. In particular, miRNAs have been used to develop signatures for breast cancer profiling. We are interested in the consequences of ATM deficiency on miRNA expression in breast epithelial cells and the potential contribution to cancer predisposition. In this study we investigate the effects of ATM loss on the miRNA expression and related gene expression changes in normal human mammary epithelial cells (HME-CC). We have identified 81 significantly differently expressed miRNAs in the ATM-deficient HME-CCs using small RNA sequencing. Many of these differentially expressed miRNAs have been described and implicated in tumorigenesis and proliferation. These changes include down-regulation of tumor suppressor miRNAs, such as hsa-miR-29c and hsa-miR-16, as well as the over-expression of pro-oncogenic miRNAs hsa-miR-93 and hsa-mir-221. All 81 miRNAs were combined with genome wide gene expression profiles to investigate possible targets of miRNA regulation. We identified messenger RNA (mRNA) targets of these miRNAs that were also significantly regulated after the depletion of ATM. Predicted targets included many genes implicated in cancer formation and progression, including SOCS1 and the proto-oncogene MAF. Integrated analysis of miRNA and mRNA expression allows us to build a more complete understanding of the pathways and networks involved in the breast cancer predisposition observed in individuals deficient in ATM. This study highlights miRNA and predicted mRNA target expression changes in ATM-deficient HME-CCs and suggests a mechanism for the breast cancer-prone phenotype seen in ATM deficient cells and patients. Additionally, this study provides preliminary data for defining miRNA profiles that may be used prognostic biomarkers for breast cancer predisposition. Examination of small RNA population in human mammary epithelial cell lines. Each condition was preformed in triplicate.

Dataset Information

Mir-30e* is an independent subtype-specific prognostic marker in breast cancer

Similar Datasets

OmicsDI is part of the ELIXIR infrastructure

Tweets