PTK7 and neoplasm: PTK7 is overexpressed in multiple tumor types, including advanced NSCLC, ovarian cancer, triple-negative breast cancer (TNBC), colon, gastric, and esophageal cancers (Shin et al., 2013; Chen et al., 2014; Gärtner et al., 2014; Haiyan et al., 2014; Lhoumeau et al., 2015; Jiang et al., 2019).