AJAP1 and neoplasm: Adherens turbine-associated protein 1 (AJAP1) is a transmembrane protein in epithelial cell adhesion junctions (Bharti et al., 2004) and has shown tumor inhibition activity in hepatocellular carcinoma (Han et al., 2017), esophageal cancer (Tanaka et al., 2015), and breast cancer (Xu et al., 2019a).