The Gene Expression Omnibus (GEO; https://www.ncbi.nlm.nih.gov/geo/) is known as a public functional genomics data repository containing array- and sequence-based data, which allows users to search, browse and download gene expression profiles. After careful review and comparison, we obtained three gene expression profiles of BC and normal breast tissues, namely, GSE42568, GSE45827 and GSE54002. Microarray datasets of GSE42568, GSE45827 and GSE54002 were all processed on the GPL570 platform ([HG-U133_Plus_2] Affymetrix Human Genome U133 Plus 2.0 Array) and contained 104 BC tissues and 17 normal breast tissues, 130 BC tissues and 11 normal breast tissues, and 417 BC tissues and 16 breast tissues, respectively.

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