Fig. 1

a Breast cancer tumors analyzed at protein expression level largely form the same type of clusters as seen at the gene expression level. This is a Sammon map of the tumors using protein expression data from 2D-DIGE with matched mRNA data, color coded according to the Sørlie gene expression classification of the same; luminal A (dark blue), luminal B (light blue), ERBB2 (purple), basal-like (red) and normal-like (green). Samples from BRCA1-mutated patients are indicated as empty rings. b Corresponding hierarchal clustering of the same samples using the same data. The basal-like and the luminal A clusters are strikingly homogenous