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

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

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

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