New metastatic lymph node classification for early gastric cancer should differ from those for advanced gastric adenocarcinoma: Results based on the SEER database

Table 1 Patient and tumor characteristic

Characteristic	SEER set (10714 patients)		FMUUH set (4407 patients)		P-valus
	mean or n	SD or %	mean or n	SD or %
Age (SD)	67.1	13.1	59.8	11.3	0.000
Sex					0.000
Male	6497	60.6	3321	75.4
Female	4217	39.4	1086	24.6
Race					-
White	6539	61.0	-	-
Black	1297	12.1	-	-
Other	2848	26.6	-	-
Unknown	30	0.3	-	-
No. of examined nodes (SD)	24.99	10.7	30.9	13.0	0.000
pT category					0.000
pT1	1814	16.9	899	20.4
pT2	1167	10.9	534	12.1
pT3	4417	41.2	954	21.6
pT4a	3316	30.9	2020	45.8
pN category					0.000
pN0	3169	29.6	1485	33.7
pN1	1530	14.3	630	14.3
pN2	1820	17.0	781	17.7
pN3a	2596	24.2	928	21.1
pN3b	1599	14.9	583	13.2
TNM stage					0.000
IA	1353	12.6	738	16.7
IB	754	7.0	372	8.4
IIA	1323	12.3	387	8.8
IIB	1213	11.3	537	12.2
IIIA	1328	12.4	921	20.9
IIIB	2569	24.0	882	20.0
IIIC	2174	20.3	570	12.9