Does gastric stump cancer really differ from primary proximal gastric cancer? A multicentre, propensity score matching-used, retrospective cohort study

Table 2 Univariate analysis of cancer-specific survival in gastric stump cancer and proximal gastric cancer

Variables	GSC				PGC
	n = 152	HR	95%CI	P value	n = 152	HR	95%CI	P value
Gender		1.991	0.937-3.422	0.038a		1.991	0.937-3.422	0.038a
Female	38				38
Male	114				114
Age (yr)		1.117	0.681-1.833	0.900		1.111	0.690-1.804	0.893
> 55	120				119
≤ 55	32				33
Tumor size		1.012	0.622-1.646	0.961		1.405	0.598-1.837	0.902
> 3.5 cm	91				77
≤ 3.5 cm	61				75
ASA grade		1.338	0.792-2.260	0.276		1.257	0.777-2.900	0.331
I/II	99				101
III/IV	53				51
Hospital stay after surgery (d)	11.13 ± 4.71	0.635	0.308-1.307	0.218	12.45 ± 5.90	0.873	0.299-1.780	0.412
Blood transfusion		1.114	0.655-1.896	0.690		1.296	0.588-2.001	0.255
Yes	44				67
No	108				85
Vascular invasion		1.662	0.210-2.138	0.630		1.603	1.000-9.568	0.049a
Positive	32				70
Negative	49				82
Missing	71				-
Nerve invasion		1.710	0.971-3.012	0.063		4.660	0.981-22.134	0.053
Positive	40				63
Negative	49				89
Missing	63				-
Differentiation degree		2.714	1.603-4.596	0.000a		3.503	1.734-11.385	0.000a
High/median	27				21
Low	115				131
Missing	10				-
Depth of infiltration		3.614	2.290-4.289	0.080		2.332	0.074-4.498	0.041a
T1/T2	36				43
T3/T4	116				109
Number of lymph nodes		0.792	0.336-1.869	0.595		3.432	0.874-12.441	0.077
≥ 7	94				115
< 7	58				37
Positive lymph nodes		0.223	0.110-0.881	0.124		0.485	0.260-0.906	0.023a
≥ 3	71				109
< 3	81				43
TNM stage		5.727	2.579- 12.715	0.000a		5.446	2.555-11.992	0.000a
I	17				18
II	38				39
III	97				95

^aP < 0.05.

HR: Hazard ratio; CI: Confidence interval; GSC: Gastric stump cancer; PGC: Proximal gastric cancer; TNM: Tumor-node-metastasis; ASA: American Society of Anaesthesiologists.