ERBB2 and breast cancer: A number of enriched pathways were identified multiple times as they were included in more than one database, including estrogen response and estrogen-dependent breast cancer signaling, ErbB signaling and ErbB2/ErbB3 signaling, PI3K-Akt mTOR signaling and PI3K-AKT signaling or mTOR signaling, and ERK MAPK signaling, ultraviolet B (UVB)-induced MAPK signaling, and MAPK up genes.