Factors

Number of patients

Age

<65

16

≥65

25

Gender

Male

31

Female

10

Smoking

Never

8

Current/Former

33

Histology

Adenocarcinoma

21

Others

20

p Stage

I

30

II-III

11

pT status

pT1

25

pT2 - 3

16

pN status

pN0

34

pN1 - 2

7

CEA

Normal

21

High

20

KL-6

Normal

22

High

19

SP-D

Normal

21

High

20