Table 1 General characteristics of patients with pT3N0M0 stage thoracic esophageal squamous cell carcinoma

Sex

3.284

0.070

 Male

228 (77.6%)

71 (84.5%)

157 (74.8%)

 Female

66 (22.4%)

13 (15.5%)

53 (25.2%)

Age (years)

0.721

0.396

 <60

141 (48.0%)

37 (44.0%)

104 (49.5%)

 ≥60

153 (52.0%)

47 (56.0%)

106 (50.5%)

Tumor location

0.411

0.814

 Upper thoracic

70 (23.8%)

19 (22.6%)

51 (24.3%)

 Middle thoracic

163 (55.4%)

49 (58.3%)

114 (54.3%)

 Lower thoracic

61 (20.8%)

16 (19.0%)

45 (21.4%)

Surgical approach

1.723

0.189

 Ivor–Lewis

92 (31.3%)

31 (36.9%)

61 (29.0%)

 McKeown

202 (68.7%)

53 (63.1%)

149 (71.0%)

Length of lesion

0.311

0.577

 <4 cm

171 (58.2%)

39 (46.4%)

90 (42.9%)

 ≥4 cm

123 (41.8%)

45 (53.6%)

120 (57.1%)

Angioinvasion

0.707

0.400

 No

272 (92.5%)

76 (90.5%)

196 (93.3%)

 Yes

22 (7.5%)

8 (9.5%)

14 (6.7%)

Perineural invasion

0.973

0.324

 No

56 (19.0%)

65 (77.4%)

173 (82.4%)

 Yes

238 (81.0%)

19 (22.6%)

37 (77.4%)

No. of removed LNs

1.875

0.171

 <15

88 (29.9%)

30 (35.7%)

58 (27.6%)

 ≥15

206 (70.1%)

54 (64.3%)

152 (72.4%)

No. of dissected LN stations

0.702

0.402

 <6

91 (31.0%)

29 (34.5%)

62 (29.5%)

 ≥6

203 (69.0%)

55 (65.5%)

148 (70.5%)

Tumor grade

0.002

0.999

 Well-differentiated

63 (21.4%)

18 (21.4%)

45 (21.4%)

 Moderately differentiated

136 (46.3%)

39 (46.4%)

97 (46.2%)

 Poorly differentiated

95 (32.3%)

27 (32.1%)

68 (32.4%)

Adjuvant therapy

1.827

0.401

 No

139 (47.3%)

41 (48.8%)

98 (46.7%)

 Chemotherapy

132 (44.9%)

34 (40.5%)

98 (46.7%)

 Radiotherapy/Chemoradiotherapy

23 (7.8%)

9 (10.7%)

14 (6.7%)