Table 5.

Univariate Cox regression analysis for survival in SBA patients with metastasis.

Characteristics	Overall survival		Cancer specific survival
	HR (95%CI)	P-value	HR (95%CI)	P-value
Age
<60	Reference		Reference
60–69	1.191(0.945–1.497)	0.139	1.179(0.933–1.490)	0.167
70–79	1.517(1.189–1.934)	<0.001	1.504(1.175–1.926)	0.001
≥80	2.115(1.590–2.814)	<0.001	2.206(1.639–2.970)	<0.001
Sex
Female	Reference		Reference
Male	1.062(0.884–1.275)	0.521	1.051(0.872–1.267)	0.602
Marital status
Married	Reference		Reference
Unmarried	1.078(0.894–1.299)	0.433	1.075(0.888–1.302)	0.459
Unknown	1.292(0.835–1.998)	0.250	1.328(0.850–2.075)	0.213
Primary site
Duodenum	Reference		Reference
Jejunum	0.497(0.383–0.645)	<0.001	0.499(0.381–0.652)	<0.001
Ileum	0.584(0.440–0.774)	<0.001	0.587(0.442–0.781)	<0.001
Other	0.758(0.575–1.000)	0.051	0.742(0.558–0.988)	0.041
Grade
I/II	Reference		Reference
III/IV	1.396(1.164–1.673)	<0.001	1.391(1.156–1.675)	<0.001
T stage
T1/T2	Reference		Reference
T3	0.678(0.494–0.931)	0.016	0.669(0.485–0.924)	0.015
T4	0.724(0.552–0.950)	0.020	0.721(0.548–0.949)	0.019
TX	1.300(0.966–1.750)	0.084	1.323(0.979–1.788)	0.068
N stage
N0	Reference		Reference
N1	0.790(0.636–0.980)	0.032	0.800(0.642–0.998)	0.048
N2	0.829(0.643–1.068)	0.146	0.854(0.660–1.107)	0.233
NX	1.038(0.752–1.434)	0.820	1.058(0.760–1.472)	0.738
Surgery
No	Reference		Reference
Yes	0.491(0.408–0.591)	<0.001	0.487(0.4026–0.588)	<0.001
Retrieval of regional lymph nodes
0	Reference		Reference
1–3	0.621(0.450–0.858)	0.004	0.608(0.435–0.850)	0.004
≥4	0.509(0.412–0.628)	<0.001	0.505(0.407–0.627)	<0.001
Radiation
No	Reference		Reference
Yes	1.664(1.195–2.317)	0.003	1.633(1.167–2.285)	0.004
Chemotherapy
No	Reference		Reference
Yes	0.477(0.395–0.577)	<0.001	0.462(0.381–0.561)	<0.001