Table 1. The clinical characteristics of 41 patients.

Clinical characteristics	No.	(%)
Mean age, years (range)	26.4±3.5
Sex
Male	23	56.1
Female	18	43.9
Smoking
Non-smoker	36	87.8
Current or ex-smoker	5	12.2
Symptoms present
Cough	25	61.0
Chest tightness/dyspnea	10	24.4
Chest pain	9	22.0
Hemoptysis	5	12.2
Bone/muscle pain	7	17.1
Fever	6	14.6
No symptom	12	29.3
Family history	1	2.4
NSCLC TNM stage
I	6	15.3
II	6	15.3
IIIa	5	12.8
IIIb	2	5.1
IV	20	51.2
SCLC stage
Extensive	2
Limited	0