First we analyzed the Cancer Genome Atlas (TCGA) breast cancer cohort by single-sample gene set enrichment analysis (ssGSEA25), with a CD44+CD24− BCSC signature previously identified in human breast carcinomas26, and then the genes with expression highly correlated with the BCSC ssGSEA scores in the TCGA samples were selected. The gene discussed is CD24; the disease is breast carcinoma.