EGFR and squamous cell carcinoma: Upon performing univariate analysis, it was found that age (≥70 years), sex (male), histology (squamous carcinoma), pathological (p‐) stage (III‐IV > II > I), smoking history (smoker), EGFR mutation (negative), TP53 mutation (positive), and the number of coexisting mutations (≥2) were factors related to shorter RFS.