PTK7 and cancer: PTK7 has been shown to be involved in vertebrate embryogenesis (Shnitsar & Borchers, 2008) and epithelial‐mesenchymal transition which plays an important role in cancer (Ataseven et al., 2013; Katoh 2005; Khramtsov et al., 2010; Geyer et al., 2011; Saitoh, 2015; Yoshizawa et al., 2013).