Table 4.

Comparison of serum levels of CEA and CA19-9 between the two groups [n (%)]

Group	n	CEA		CA19-9
		Before treatment	After treatment	Before treatment	After treatment
OG	30	45.4±7.66	24.5±3.58	72.1±12.13	50.1±12.25
CG	30	43.2±8.43	9.3±1.62	75.4±15.93	31.4±5.69
t		0.884	4.245	0.821	6.428
P		0.521	<0.001	0.416	<0.001

CG: control group; OG: observation group; CEA: carcinoembryonic antigen.