Table 1 PFN2 clinicopathological characteristics of patients with ESCC from Chinese Han and Kazakh population

Age at surgery, years

 Median

62.5

57.4

 Range

42–81

34–75

Gender

 Male

137

71.4

108

64.3

 Female

55

28.6

60

35.7

Differentiation^a

 Well

67

34.9

39

23.2

 Moderate + Poor

125

65.1

129

76.8

Invasion depth

 T1–T2

79

41.1

83

49.4

 T3–T4

113

58.9

85

50.6

Lymph node metastasis

 No

127

66.1

79

47.0

 Yes

65

33.9

89

53.0

TNM stage^b

 I + II

154

80.2

111

66.1

 III + IV

38

19.8

57

33.9