Table 2 The log-rank univariate analysis of patients

Age (year)

2.104

0.14

<50

45

85.4

76.9

≥50

96

78.8

55.4

Sex

1.208

0.272

Male

97

80.3

68.5

Female

44

83.7

69.7

6.563

0.010

Pre-operative CEA (n g/m L)

<5

100

87.4

74.1

≥5

41

65.1

52.7

Distance to anal (cm)

3.299

0.19

0-5

61

80.3

68.0

6-10

56

79.9

61.8

10-15

24

Operation type

1.958

0.162

Dixon

97

85.8

74.1

Miles

44

71.5

58.1

Histologic type

3.053

0.081

Adenocarcinoma

134

83.1

Mucinous adenocarcinoma

7

44.8

Grade of differentiated

29.906

0.000

Well

24

80.8

68

Moderately

113

83.5

68

Poor

4

4.7

Maximum diameter (cm)

0.106

0.74

<5

75

80.5

59.5

≥5

66

81.9

70.6

Number of retrieved lymph nodes

11.616

0.000

<5

66

68.2

57.4

≥5

75

93

Lymph-vascular invasion

0.087

0.768

Yes

9

85.7

22.4

No

132

81.6

71.9

Radiation

2.787

0.095

Yes

42

87.9

74.5

No

97

91.2

90.7

Perirectal fat infiltration

3.953

0.009

Yes

55

76.2

40.5

No

86

86.5

71.9