Prognostic Impact of the Number of Examined Lymph Nodes in Stage II Colorectal Adenocarcinoma: A Retrospective Study

Table 1

Baseline characteristics of stage II, stage III, and validation cohort patients.

Cohort	SEER database (1988-2013) LN negative, T3/T4	SEER database (1988-2013) LN positive, T3/T4	SEER database (2014) stage II
Total	173355	135130	4410
Sex
Male	86629	67315	2306
Female	86726	67815	2104
Age
Race
White	143911	108518	3495
Black	16227	14307	487
Others	13217	12305	428
Grade
Well differentiation	13401	6531	302
Moderate differentiation	130450	89418	3494
Poor differentiation	27073	35813	510
Undifferentiatiated	2431	3368	104
Surgical site
Right hemicolon resection	71173	54468	1729
Transeverse colon resection	16158	10306	399
Left hemicolon resection	28459	23833	744
Sigmoid colectomy	34229	28395	916
Rectal resection	23336	18128	649
Chemotherapy	42874	75358	1243
Radiotherapy	22126	19052	630
T stage
T3	148701	107457	3744
T4	24654	27679	666
N stage
N0	173335	0	4410
N1	0	84955	0
N2	0	50175	0
ELN volume	14 (1-90)	15 (1-90)	18 (1-90)
Follow-up	63 (0-348)	43 (0-347)	28 (0-25)
Tumor-specific death	29082	46243	375