Hierarchical clustering of classes based on class similarity in sharing common aberrations. The square at the intersection of each two diagonals shows the similarity of their classes as measured by the aberrations associated with them (Materials and methods). (An aberration was associated with a tumor class if the correlation had a (uncorrected) P-value < 0.05.) Names of cancer classes are colored as follows: orange, lymphoid disorders; red, non-lymphoid hematological disorders; light green, benign solid tumors; dark green, malignant solid tumors. Classes that showed no significant similarity to any other class at FDR 5% were not included in the clustering.