Compared with EGFR‐negative cases, the most were female (χ2 = 45.938, P < 0.001), non‐smoking (χ2 = 51.838, P < 0.001), and adenocarcinoma (χ2 = 37.731, P < 0.001) patients in the EGFR‐positive group. Here, EGFR is linked to adenocarcinoma.