Predictive value of systemic immune-inflammation index and serum lactoferrin for postoperative survival in older patients with colon cancer

Table 6 Tumor markers

Detection period	CEA (ng/mL)	CA19-9 (U/mL)	CEA positive proportion (%)	CA19-9 positive proportion (%)	χ2/t	P value
Preoperative 7 days	4.72 ± 1.08	28.34 ± 10.47	14.52	9.68	2.324	0.13
Postoperative 1 week	5.38 ± 1.34	32.61 ± 11.32	18.38	12.9	3.126	0.075
Postoperative 3 months	4.96 ± 1.24	30.22 ± 9.88	15.32	11.29	2.812	0.097
Postoperative 6 months	6.13 ± 1.52	36.19 ± 12.78	22.58	18.55	4.214	0.04

P < 0.05 indicated significant difference. CEA: Carcinoembryonic antigen; CA19-9: Carbohydrate antigen 19-9.