Table 6.

Multivariate 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	1.221(0.964–1.545)	0.097	1.214(0.955–1.544)	0.113
70–79	1.261(0.979–1.626)	0.073	1.236(0.954–1.601)	0.109
≥80	1.462(1.076–1.987)	0.015	1.512(1.098–2.082)	0.011
Primary site
Duodenum	Reference		Reference
Jejunum	0.759(0.552–1.044)	0.09	0.802(0.575–1.118)	0.192
Ileum	0.865(0.600–1.247)	0.436	0.932(0.641–1.356)	0.714
Other	1.187(0.866–1.628)	0.286	1.202(0.868–1.664)	0.267
Grade
I/II	Reference		Reference
III/IV	1.600(1.325–1.932)	<0.001	1.564(1.290–1.897)	<0.001
T stage
T1/T2	Reference		Reference
T3	0.999(0.709–1.410)	0.999	0.992(0.699–1.408)	0.965
T4	0.925(0.688–1.244)	0.604	0.928(0.687–1.254)	0.626
TX	1.179(0.869–1.600)	0.291	1.211(0.889–1.649)	0.224
N stage
N0	Reference		Reference
N1	1.059(0.843–1.331)	0.623	1.100(0.869–1.392)	0.430
N2	1.517(1.108–2.078)	0.009	1.576(1.145–2.170)	0.005
NX	0.911(0.650–1.278)	0.590	0.962(0.680–1.361)	0.825
Surgery
No	Reference		Reference
Yes	0.708(0.495–1.014)	0.059	0.714(0.495–1.029)	0.071
Retrieval of regional lymph nodes
0	Reference		Reference
1–3	0.991(0.673–1.460)	0.963	0.976(0.655–1.455)	0.906
≥4	0.601(0.416–0.869)	0.007	0.567(0.389–0.826)	0.003
Radiation
No	Reference		Reference
Yes	1.156(0.814–1.640)	0.419	1.133(0.794–1.615)	0.492
Chemotherapy
No	Reference		Reference
Yes	0.456(0.371–0.561)	<0.001	0.442(0.357–0.546)	<0.001