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Table 4 Survival of different fields of positive lymph nodes according to the pN stage

From: Cervical lymph node metastasis classified as regional nodal staging in thoracic esophageal squamous cell carcinoma after radical esophagectomy and three-field lymph node dissection

  

5-year

Median survival

  

Variable

All (%)

Survival rate (%)

Time (months)

χ2value

P-value

pN1

   

2.136

0.144

 1 field

160 (29.3)

45.6

51.8

  

 2 fields

66 (12.1)

36.8

42.3

  

pN2

   

1.940

0.379

 1 field

30 (5.5)

32.6

24.2

  

 2 fields

126 (23.0)

20.3

24.9

  

 3 fields

65 (11.9)

15.5

21.9

  

pN3

   

2.311

0.315

 1 field

1 (0.2)

0.0

31.5

  

 2 fields

22 (4.0)

25.0

16.7

  

 3 fields

77 (14.1)

5.1

14.7

  

Fields of LNM

   

0.154

0.695

 C + M

163 (76.2)

23.7

25.9

  

 C + A

51 (23.8)

30.1

34.0

  
  1. Abbreviations: A, abdominal; C, cervical; LNM, lymph node metastasis; M, mediastinal.
  2. a1 field (cervical lymph nodes), 2 fields (cervical + mediastinal, and/or cervical + abdominal lymph nodes), 3 fields (cervical + mediastinal + abdominal lymph nodes) with positive lymph nodes.
  3. Abbreviations: CI = confidence interval; CLM = cervical lymph node metastasis; HR = hazard ratio; LNM, lymph node metastasis; SE = standard error; TE-SCC = thoracic esophageal squamous cell carcinoma.