PTK7 and lung cancer: Finally, using the Kaplan–Meier Plotter database (http://kmplot.com/analysis/), we disclosed that higher levels of PTK7 mRNA were statistically significantly associated with poorer overall survival in patients with lung adenocarcinoma (n = 719; log‐rank p < 0.001) (Figure 3F), thereby implicating PTK7 in lung cancer progression.