WWP2 and lip and oral cavity carcinoma: WWP2 functions as an oncogene in liver cancer, breast cancer, endometrial cancer, gastric cancer, lung cancer, oral cancer, and ovarian cancer (Clements et al., 2015; Fang et al., 2020; Fukumoto et al., 2014; Jung et al., 2014; Wang et al., 2020; Butt et al., 2019; Sakashita et al., 2013; Wan et al., 2019).