Relationships between prognostic signatures. Scatter plots showing the pair wise relationships between the prognostic signatures. For each signature the score was calculated as the weighted average of the expression level of the genes in the signature (see Methods). To compensate for the possibility that different signatures might show high correlation merely as a result of a common gene composition, the overlapping genes between each signature pair were not taken into account in the computation of the scores. Each point in the scatter plots represents a single tumor analyzed in the human and the dog dataset, respectively represented by squares and triangles. The Pearson's correlations and the corresponding p-values between each pair of expression signatures across the human (n = 68) and canine (n = 26) tumor datasets are indicated in each panel.