Project description:In a previous study of ductal carcinoma in situ (DCIS) of the breast (see GEO accession #GSE7882) we identified six genes at chromosome 17q21.33 that were over-expressed in high grade cases, and showed a correlation between expression level and gene copy number. The aim of this study was to determine whether potential drivers of high grade breast cancer growth could be identified at 17q21.33. High resolution comparative genomic hybridisation was used to interrogate genomic aberrations in laser capture microdissected samples of ductal carcinoma in situ.
Project description:In the breast, the reduction of invasive ductal carcinoma (IDC) seems to be smaller than expected from an increasing number of ductal carcinoma in situ (DCIS) detection in screening programs, suggesting that some DCIS lesions remain dormant and take a very long time for progression to IDC. However, the progression risk of individual DCIS and papilloma to IDC largely remain unassessable. To tackle this problem, we applied array-based comparative genomic hybridization to DCIS, IDC and papilloma lesions. We confirmed the presence of chromosomal copy-number alterations (CNAs) reported previously in breast cancers and the absence of chromosomal CNAs in the papillomas examined. These findings suggest that gene CNA profile is a good lineage marker for prediction of progression risk of individual tumors and that tumor progression within each lineage is driven by epigenetic rather than genetic alterations.
Project description:This SuperSeries is composed of the following subset Series: GSE41194: Differentially Expressed Genes Regulating the Progression of Ductal Carcinoma In Situ to Invasive Breast Cancer (Group 1) GSE41196: Differentially Expressed Genes Regulating the Progression of Ductal Carcinoma In Situ to Invasive Breast Cancer (Group 2) GSE41197: Differentially Expressed Genes Regulating the Progression of Ductal Carcinoma In Situ to Invasive Breast Cancer (Group 3) GSE41198: Differentially Expressed Genes Regulating the Progression of Ductal Carcinoma In Situ to Invasive Breast Cancer (Group 4 stroma) GSE41227: Differentially Expressed Genes Regulating the Progression of Ductal Carcinoma In Situ to Invasive Breast Cancer (Group 4 Epithelial) Refer to individual Series
