Table 1 Clinical features of patients

Male:female

10:11

Age (mean)

43.4

Smoking

2/21

Initial symptoms

Cough

7

Bloody sputum

3

Hemoptysis

2

Cough and bloody sputum

2

Cough and hemoptysis

1

Dyspnea

1

Chest pain

1

Asymptomatic

4

Tumor location

Right main bronchus

1

Left main bronchus

2

Intermediate bronchus

2

Right upper lobe

3

Right middle lobe

2

Right inferior lobe

5

Left upper lobe

4

Left inferior lobe

2