Figure 3.

Sequence-matched probe sets provide more consistent classification results derived from breast cancer associated gene expression data sets obtained by different types of microarray platforms. Hierarchical clustering of two different subsets of genes taken from the data set published by West et al. (5). (Top) The result using the 293 genes as suggested by Sorlie et al. (4) after matching genes between the Affymetrix and cDNA microarray platforms using Unigene IDs. (Bottom) The clustering result by reducing the gene set to only those that are also sequence-matched between the two platforms. The color code of the samples was assigned as described in Sorlie et al. (4,7).