WWP1 and breast cancer: Moreover, the expression of several WBP2NL-related genes such as WW domain-containing E3 ubiquitin protein ligase 1 (WWP1), neural precursor cell expressed developmentally downregulated 4 (NEDD4), BCL2-associated athanogene 3 (BAG3), and WWOX is tested in both malignant breast and normal breast cancer tissues, and all are involved in the tumorigenic signal networks.