Figure 4

Classification of tumours on the basis of microarray expression profiles. (a) Dendrogram showing hierarchical clustering based on expression data from a set of 1,164 cDNAs measured across 64 cell lines. (b) A coloured representation of the data rows (genes) and columns (cell lines) in cluster order. The colour in each cell of the table represents the mean-adjusted expression level of the gene, with green showing underexpression and red indicating overexpression according to the chart in (b). The labels 3a-3d refer to clusters of genes for leukaemias (3a), epithelial tumours (3b), melanoma (3c) and mesenchymal tumours (3d). Published with permission from Nature Genetics [32].