Dynamic monitoring of serum tumor markers in predicting recurrence after radical gastrectomy for gastric cancer

Table 2 Comparison of preoperative and 1-month postoperative serum tumor marker levels between recurrence and non-recurrence groups [M (Q1, Q3)]

Marker	Time point	Recurrence group (n = 68)	Non-recurrence group (n = 145)	Z value	P value
CEA (ng/mL)	Preoperative	8.5 (4.2, 15.8)	3.8 (2.1, 6.5)	-5.126	< 0.001
	1 month postoperative	4.2 (2.5, 7.8)	2.3 (1.4, 3.8)	-4.285	< 0.001
CA19-9 (U/mL)	Preoperative	52.3 (24.5, 98.6)	21.8 (12.3, 42.5)	-4.863	< 0.001
	1 month postoperative	28.6 (15.2, 52.3)	14.5 (8.3, 25.6)	-4.157	< 0.001
CA72-4 (U/mL)	Preoperative	12.8 (5.6, 28.4)	4.8 (2.5, 9.2)	-5.347	< 0.001
	1 month postoperative	6.5 (3.2, 14.5)	2.8 (1.5, 5.2)	-4.526	< 0.001
CA125 (U/mL)	Preoperative	48.5 (22.3, 86.7)	18.6 (10.2, 32.5)	-5.694	< 0.001
	1 month postoperative	24.8 (12.5, 45.6)	11.3 (6.8, 18.5)	-4.872	< 0.001

CEA: Carcinoembryonic antigen; CA19-9: Carbohydrate antigen 19-9; CA72-4: Carbohydrate antigen 72-4; CA125: Carbohydrate antigen 125.