Table 1. Clinical Characteristics of Patients and Controls.

Variable	SRC group (n=15)	NMAC group (n=75)	P-value*
Presenting symptoms			0.090
Abdominal pain	9 (60.0)	32 (42.7)
Hematochezia	5 (33.3)	13 (17.3)
Obstructive symptoms†	7 (46.7)	9 (12.0)
None	0 (0.0)	21 (28.0)
CEA (ng/mL), median (range)	3.2 (1.5-9.4)	1.9 (1.2-3.2)	0.086
Location
Right colon/Left colon	4 (27.7)/11 (73.3)	55 (73.3)/20 (26.7)	0.003
Synchronous adenoma	3 (20.0)	37 (49.3)	0.045
Endoscopic feature			0.001
Early colon cancer	0 (0.0)	1 (1.3)
Borrmann type 1	1 (7.1)	6 (8.0)
Borrmann type 2	1 (7.1)	50 (66.7)
Borrmann type 3	6 (42.9)	17 (22.7)
Borrmann type 4	6 (42.9)	1 (1.3)

Values are presented as n (%).

^*Conditional logistic regression that accounted for the clustering of matched pairs.

^†Obstructive symptoms such as abdominal pain, constipation, and vomiting.

SRC, signet-ring cell carcinoma; NMAC, non-mucinous adenocarcinoma; CEA, carcinoembryonic antigen.