Table 1.

Clinical characteristics of included patients with non-small cell lung cancer (NSCLC)

Clinical characteristic	N	Percentage (%)
Age (years)
≤65	407	43.5
>65	528	56.5
Gender
Male	561	60.0
Female	374	40.0
TNM stage
I-II	746	79.8
III-IV	189	20.2
T stage
T1-2	785	84.0
T3-4	150	16.0
N stage
N0	599	64.1
N1-3	336	35.9
M stage
M0	697	74.5
M1-3	238	25.5