YAP1 and breast cancer: Emerging studies also show that Wnt signaling promotes breast cancer by blocking ITCH-mediated (an ubiquitin-conjugating enzyme) ubiquitin-dependent degradation of the YAP/TAZ transcriptional coactivator WBP2, suggesting WBP2/ITCH signaling functions to bridge the complex Wnt and Hippo signaling networks in breast cancer [79].