Table 2. Serum expression levels of three tumor markers and survival of GC patients in all sample sets.

Combined tumor marker Data set	Patients	Deaths	MST (months)	P Valuea	95%CI
CEA
Low, ≤2.48	863	306	25.03
High, >2.48	703	337	18.90	<0.001	1.509(1.293,1.762)
CA19-9
Low, ≤28.81	1246	455	24.47
High, >28.81	320	188	16.30	<0.001	1.957(1.650, 2.321)
CA72-4
Low, ≤2.47	1025	396	24.97
High, >2.47	541	247	17.67	<0.001	1.417(1.209, 1.662)
No. of high risk tumor marker(ref:0)	525	169	27.80	<0.001
1	610	236	22.90	0.003	1.352(1.110, 1.648)
2	339	178	18.13	<0.001	2.033(1.647, 2.510)
3	92	60	11.15	<0.001	3.263(2.427, 4.386)

CEA, carcino-embryonic antigen; CA19-9, carbohydrate antigen 19-9; CA72-4, carbohydrate antigen 72-4; No, number.

^a Cox proportional hazards model.