Solitary lymph node metastasis is a distinct subset of colon cancer associated with good survival: a retrospective study of surveillance, epidemiology, and end-results population-based data

Table 1 Characteristics of patients from SEER Database by LN involvement

	Total	N0	N1a	N1b	P value
Characteristic	(n = 86674)	(n = 61696)	(n = 12416)	(n = 12562)	P value
Media follow up (mo)	85	90	78	69	<0.001
(IQR)	(54–121)	(62–124)	(39–116)	(30–108)	<0.001
Years of diagnosis					0.102
1988-1993	17214	12196	2489	2529
1994-1999	24641	17436	3629	3576
2000-2003	32064	17436	6298	6457
Sex					0.818
Male	43210	30798	6177	6235
Female	43464	30898	6239	39876327
Age					<0.001
<60	27442	18170	4293	4439
≥60	59232	42986	8123	8123
Race					<0.001
White	69850	50278	9667	9905
Black	9407	6337	1574	1496
Other	7154	4872	1145	1137
Unknown	263	209	30	24
Pathological grading					<0.001
High/moderate	41097	28840	6121	6136
Poor/anaplastic	7723	4503	1434	1786
Unknown	1750	1232	251	267
Histotype					<0.001
Adenocarcinoma	76387	54697	10817	10873
Mucinous cell	9667	6671	1480	1516
Signet ring cell	486	239	96	151
T stage					<0.001
T1	12141	11055	746	340
T2	14570	11995	1531	1044
T3	28192	18982	4532	4678
T4a	27669	17195	4860	5614
T4b	4102	2469	747	886
No. of LNs dissected					<0.001
<12	47920	34671	6693	6556
≥12	38754	27025	5723	6006

ISSN: 1471-2407