biostudies-otherLisowska KM125-136https://www.ebi.ac.uk/biostudies/studies/S-ECPF-GEOD-50567EurocanPlatformWe have analyzed, using DNA microarrays, putative differences in gene-expression level between hereditary BRCA1 mutation-linked and sporadic breast cancer. Our results show that a previously reported marked difference between BRCA1-mutation linked and sporadic breast cancer was probably due to uneven stratification of samples with different ER status and basal-like versus luminal-like subtype. We observed that apparent difference between BRCA1-linked and other types of breast cancer found in univariate analysis was diminished when data were corrected for ER status and molecular subtype in multivariate analyses. In fact, the difference in gene expression pattern of BRCA1-mutated and sporadic cancer is very discrete. These conclusions were supported by the results of Q-PCR validation. We alsbiostudies-othertranscription profiling by arrayEurocanPlatformUnknown3Frontiers in bioscience (Elite edition)Homo sapiensDudaladava VJarzab BStobiecka ELubinski JJarzab MHuzarski TLisowska KMChmielik EfalseBRCA1-related gene signature in breast cancer: the role of ER status and molecular typeWe have analyzed, using DNA microarrays, putative differences in gene-expression level between hereditary BRCA1 mutation-linked and sporadic breast cancer. Our results show that a previously reported marked difference between BRCA1-mutation linked and sporadic breast cancer was probably due to uneven stratification of samples with different ER status and basal-like versus luminal-like subtype. We observed that apparent difference between BRCA1-linked and other types of breast cancer found in univariate analysis was diminished when data were corrected for ER status and molecular subtype in multivariate analyses. In fact, the difference in gene expression pattern of BRCA1-mutated and sporadic cancer is very discrete. These conclusions were supported by the results of Q-PCR validation. We als2016-04-14T14:29:21Z20112016-04-14T14:29:21Z2016-04-14T14:29:21ZS-ECPF-GEOD-50567GSE50567E-GEOD-50567EFO_0000635EFO_0000305E-GEOD-50567