LRPAP1 and cancer: Oncogenic functions of RAP proteins have been well established in multiple cancer types, such as breast (Di et al., 2015a), lung (Fu et al., 2009; Wu et al., 2014; Xie et al., 2015; Peng et al., 2016), ovary (Che et al., 2015; Lu et al., 2016), stomach (Zhang J. et al., 2020), cervix (Li et al., 2018), prostate (Bigler et al., 2007) and brain (Wang et al., 2017).