Table 1 Correlation of CGCG (−695~-692) methylaton with case characteristics

Sample

Cancer tissue

73

59

14

P<0.01

Paired normal tissue

73

13

60

Age at surgery

 <60

35

28

7

0.864

 >60

38

31

7

Gender

 Male

58

47

11

0.928

 Female

15

12

3

Histological classification

 Poorly differentiated

49

46

3

P<0.01

 Well differentiated

24

13

11

T classification

 T1

13

10

3

0.980

 T2

26

21

5

 T3

28

23

5

 T4

6

5

1

Lymph node metastasis

 Negative

55

44

11

0.755

 Positive

18

15

3

Distant metastasis

 Negative

69

56

13

0.761

 Positive

4

3

1

Clinical stage

 I

13

9

4

0.533

 II

22

17

5

 III

30

26

4

 IV

8

7

1