Figure 4. Hierarchical clustering of gene expression data from West et al. A. Scaled down representation of the full cluster of 242 intrinsic genes across 49 breast tumors. B. Dendrogram displaying the relative organization of the tumor samples. Branches are colored according to which subtype the corresponding tumor showed the strongest correlation with. Gray branches indicate tumors with low correlation (<0.1) to any specific subtype. C. Luminal epithelial/estrogen receptor gene cluster. D. Basal gene cluster. E. ERBB2+ gene cluster. (See also Figure 9, which is published as supporting information).