Adenosquamous carcinoma may have an inferior prognosis to signet ring cell carcinoma in patients with stages I and II gastric cancer

Table 1 Patient characteristics dichotomized by histological type before propensity score matching, n (%)

Characteristic	SRC	ASC	Total	P value
	n = 5968 (98.4)	n = 95 (1.6)	n = 6063 (100)
Age (yr)				0.008
≤ 60	2823 (47.3)	32 (33.7)	2855 (47.1)
> 60	3145 (52.7)	63 (66.3)	3208 (52.9)
Gender				< 0.001
Male	3146 (52.7)	71 (74.7)	3217 (53.1)
Female	2822 (47.3)	24 (25.3)	2846 (46.9)
Race				0.045
White	4147 (69.5)	74 (77.9)	4221 (69.6)
Black	725 (12.1)	13 (13.7)	738 (12.2)
Others	1096 (18.4)	8 (8.4)	1104 (18.2)
Marital status				0.001
Not married	2287 (38.3)	21 (22.1)	2308 (38.1)
Married	3681 (61.7)	74 (77.9)	3755 (61.9)
Tumor size (mm)				0.220
≤ 50	2271 (38.1)	42 (44.2)	2313 (38.1)
> 50	3697 (61.9)	53 (55.8)	3750 (61.9)
TNM Stage				0.299
I	1595 (26.7)	21 (22.1)	1616 (26.7)
II	888 (14.9)	20 (21.1)	908 (15.0)
III	1129 (18.9)	15 (15.8)	1144 (18.9)
IV	2356 (39.5)	39 (41.1)	2395 (39.5)
Tumor depth				0.139
T1	1398 (23.4)	16 (16.8)	1414 (23.3)
T2	2177 (36.5)	45 (47.4)	2222 (36.6)
T3	1384 (23.2)	18 (18.9)	1402 (23.1)
T4	1009 (16.9)	16 (16.8)	1025 (16.9)
LN metastasis				0.011
N0	2472 (41.4)	31 (32.6)	2503 (41.3)
N1	2080 (34.9)	46 (48.4)	2126 (35.1)
N2	926 (15.5)	16 (16.8)	942 (15.5)
N3	490 (8.2)	2 (2.1)	492 (8.1)
Distant metastasis				0.966
No	4197 (70.3)	67 (70.5)	4264 (70.3)
Yes	1771 (29.7)	28 (29.5)	1799 (29.7)
Radiotherapy				0.006
No	4553 (76.3)	61 (64.2)	4614 (76.1)
Yes	1415 (23.7)	34 (35.8)	1449 (23.9)
Surgery				0.231
No	2047 (34.3)	27 (28.4)	2074 (34.2)
Yes	3921 (65.7)	68 (71.6)	3989 (65.8)

SRC: Signet ring cell carcinoma; ASC: Adenosquamous carcinoma; TNM: Tumor-node-metastasis; LN: Lymph node.