Table 1 Patient characteristics

Tissues

 Carcinoma

78

25

53

0.0012

 Normal tissues

78

46

32

Age (years)

61.2 ± 1.7

60.8 ± 2.7

0.8984

 Gender

 Male

41

10

31

0.1502

 Female

37

15

22

Tumor size

  ≤ 5 cm

56

16

40

0.4189

  > 5 cm

22

9

13

Differentiation

 Well

31

10

21

0.0456

 Medium

38

9

29

 Poor

9

6

3

TNM stage

 I II

41

7

34

0.0037

 III VI

37

18

19

Distant metastasis

 Negative

21

35

0.115

 Positive

4

18