Table 1 Clinical information table. The major clinical factors related to prognosis were listed as following

Age

  > 60

296

73.45

178

79.46

  ≤ 60

107

26.55

46

20.54

Gender

 Male

298

73,95

163

72.77

 Female

105

26.05

61

27.23

Pathological stage

 Stage I&II

130

32.26

-

-

 Stage III

140

34.74

-

-

 Stage IV

131

32.51

-

-

 unknown

2

0.49

-

-

T stage

  ≤ T2

121

30.02

216

96.43

 T3

191

47.39

7

1.74

 T4

57

14.14

1

0.25

 unknown

34

8.44

-

-

Lymphatic node metastasis

 Negative

235

58.31

-

-

 Positive

125

31.02

-

-

 Unknown

43

10.67

-

-

Angiolymphatic Invasion

 Negative

127

31.52

-

-

 Positive

148

36.72

-

-

 unknown

128

31.76

-

-

Histological grade

 High

380

94.53

-

-

 Low

20

4.98

-

-

Vital status

 Alive

225

55.83

199

88.84

 Dead

178

45.17

25

11.16

Grade (WHO1999)

 G1

-

-

45

20.09

 G2

-

-

84

37.50

 G3

-

-

93

41.52