Analysis of our previously published gene expression data of 227 breast cancer samples profiled using oligonucleotide microarrays [34] also supported this conclusion: an expanded view of the hierarchical clustering of our tumor series showed that CD146 is included in a stromal gene cluster enriched in mesenchymal and vascular genes (see Additional data file 4), and is overexpressed in basal tumors as compared with luminal tumors (Figure 2). The gene discussed is MCAM; the disease is neoplasm.