The Cancer Genome Atlas (TCGA) data portal was used to download breast cancer data [14 (link)]. A total of 84 cases of basal-like breast cancer were analyzed. We downloaded level-3 gene expression data derived from an Agilent custom 244K whole genome microarray and somatic mutation data from an Illumina Genomic Analyzer (San Diego, CA). The gene expression level was median-centered by gene.