EGFR and lung adenocarcinoma: EGFR gene mutation status is essential to the optimal management of lung adenocarcinoma.3, 7, 8 Liquid biopsy has advantages such as noninvasiveness, speediness, and convenience.21, 22, 23 This study aimed to detect EGFR gene mutations using NGS from different types of body fluids from patients with lung adenocarcinoma.