Effects of the support system combined with Chinese medicine on postoperative gastrointestinal recovery in patients with liver cancer

Table 3 Comparison of tumor marker levels between the two groups, mean ± SD

Group	Cases	CEA (ng/mL)		TK1 (μg/L)		AFP (ng/mL)		CA19-9 (U/mL)
		Before	After	Before	After	Before	After	Before	After
Observation	49	17.25 ± 1.56	6.53 ± 0.88	2.77 ± 0.32	1.61 ± 0.36	15.44 ± 1.55	7.58 ± 0.86	46.57 ± 4.05	33.69 ± 3.06
Control	49	17.43 ± 1.22	7.26 ± 0.74	2.68 ± 0.80	1.89 ± 0.40	15.29 ± 1.40	8.99 ± 0.87	46.43 ± 4.22	36.78 ± 3.28
t	-	0.636	4.444	0.731	3.642	0.503	8.068	0.168	4.822
P value	-	0.526	< 0.001	0.466	< 0.001	0.616	<0.001	0.867	< 0.001

CEA: Carcinoembryonic antigen; TK1: Thymidine kinase 1; AFP: Alpha-fetoprotein; CA19-9: Carbohydrate antigen 19-9.