Unsupervised hierarchical clustering and gene ontology (GO) analysis of genes that are differentially expressed in carcinoma and papillary adenocarcinoma tumors. Genes with statistically significant (P < 0.05) and over twofold differences in their expression levels between the two tumor phenotypes were clustered. In each cluster, significant molecular functions, biological processes and metabolic pathways were calculated using DAVID software. The values below the name of the phenotype in each cluster were determined by "GeneSpring" and indicate relative range of expression compared to the median of gene expression in the intact mammary gland. The intact mammary gland value is 1.00. Counts are the number of genes associated with each definition in a specific cluster, which were related to the number of relevant genes in all clusters. *Total number of relevant genes is not available.