EGFR and squamous cell carcinoma: Upon performing univariate analysis, it was found that age (≥70 years), sex (male), histology (squamous carcinoma), and pathological stage (III‐IV > II > I), smoking history (smoker), EGFR mutation (negative), KRAS mutation (positive), and TP53 mutation (positive), and the large number of coexisting mutations were factors related to shorter OS.