Genes with differential expression in the carcinoma and papillary adenocarcinoma tumors were assembled into distinct metabolic pathways. KEGG pathway analysis was performed using DAVID software. Light gray background – significantly (P < 0.05) higher expression in carcinoma; gray background – no significant difference; black background – significantly (P < 0.05) higher expression in papillary adenocarcinoma; frame around background – over twofold difference. The underlined letters C (carcinoma) or P (papillary adenocarcinoma) which follow the gene name indicate an exclusive effect in one of the two tumor phenotypes compared to the mammary gland. The direction of the arrows indicates the type of change (up- or downregulation). One arrow – statistically significant (P < 0.05) difference. Two arrows – statistically significant and over twofold difference.