ERBB2 and breast cancer: In order to identify candidate tumor addiction genes, we interrogated the genome-wide Affymetrix SNP6.0 copy number and Human Exon 1.0ST gene expression profiles of 140 TNBC, 21 HER2-positive/ER-negative and 21 HER2-negative/ER-positive breast cancers, and 9 normal breast epithelium samples14–16.