Cluster analysis of mouse and human tumors using the subset of genes common to both species intrinsic lists (106 total genes). (a) Experimental sample associated dendrogram color coded according to human tumor subtype and with a matrix below showing murine tumor origins. (b) The complete 106 gene cluster diagram. (c) Close-up of genes known to be important for human basal-like tumors. (d) Close-up of genes known to be important for human luminal tumors, including ER. (e) Expression pattern of HER2/ERBB2/NEU.