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Table 1 Patient characteristics and survival according to the current and new nodal classifications

From: Evaluation of new classifications of N descriptor in non-small cell lung cancer (NSCLC) based on the number and the ratio of metastatic lymph nodes

Variables

Number of patients

5-year survival (%)

95 % CI

p value

Age

 ≤68

279

59.5

56.2–63.0

<0.001

 >68

250

46.4

43.6–49.4

 

Sex

 Male

377

50.4

47.9–53.0

0.016

 Female

152

60.5

56.0–65.5

 

Histology

 Adenocarcinoma

251

50.2

47.2–53.4

0.1

 Other

278

56.1

52.9–59.5

 

Surgery

 Lobectomy

457

55.1

52.7–57.7

0.01

 Pneumonectomy

72

41.7

37.1–46.8

 

pT

 pT1a

72

72.2

65.0–80.2

<0.001

 pT1b

69

78.3

70.9–86.4

 

 pT2a

219

54.8

51.3–58.5

 

 pT2b

69

46.4

41.1–52.3

 

 pT3

93

23.7

21.7–25.8

 

 pT4

7

28.6

18.8–43.4

 

CLN

 CLN0

377

62

59.1–65.2

p < 0.001

 CLN1

62

42

37.0–47.5

 

 CLN2

90

24

22.3–26.7

 

NLN

 NLN0

377

62

59.1–65.2

p < 0.001

 NLN1

70

39

34.3–43.3

 

 NLN2

82

26

23.3–28.2

 

RLN

 RLN0

377

62

59.1–65.2

p < 0.001

 RLN1

76

37

33.0–41.1

 

 RLN2

76

26

23.8–29.1

 
  1. CI confidence interval, CLN current nodal classification, NLN new classification based on the number of metastatic lymph nodes, RLN new classification based on the ratio of metastatic to resected lymph nodes