Table 1.

Patient characteristics

Characteristics	All patients (n = 56)
Age (years)
Median (range)	78 (41–92)
Gender
Male	39
Female	17
ECOG PS
0–1	48
2	8
History of IP	7
Emphysema	23
Previous lung operation	13
Operable case	18
Histologic type
Adenocarcinoma	25
SqCC	10
Other	4
Unknown	17
Pack years
Median (range)	40 (0–200)

ECOG, Eastern Cooperative Oncology Group; IP, interstitial pneumonia; PS, performance status; SqCC, squamous cell carcinoma.