Table 1.

Basic characteristics of all included patients with advanced lung adenocarcinoma (n = 41).

Parameters	n (%)
Gender
Male	13 (31.7)
Female	28 (68.3)
Age (years)
<65	23 (56.1)
≥65	18 (43.9)
Tumor stage
M1a	20 (48.8)
M1b	21 (51.2)
ctDNA EGFRm status
EGFRm-positive	28 (68.3)
L858R	12 (29.3)
19del	13 (31.7)
G719X	2 (4.9)
T790M	1 (2.4)
EGFRm-negative	13 (31.7)
Treatment
First-generation EGFR-TKIs	28 (68.3)
First-generation EGFR-TKIs + anti-angiogenic drugs	13 (31.7)

ctDNA: Circulating tumor DNA; EGFR: Epidermal growth factor receptor; EGFRm: Epidermal growth factor receptor mutation; TKIs: Tyrosine kinase inhibitors.