Tumor markers and multimodal magnetic resonance imaging in predicting rectal cancer stage and differentiation

Table 6 Comparison of carbohydrate antigen 19-9, cancer antigen 72-4, carcinoembryonic antigen, and alpha-fetoprotein levels in different degrees, mean ± SD

Indicator	Low differentiation (n = 105)	High differentiation (n = 4)	P value
CA19-9 (kU/L)	55.43 ± 5.12	9.62 ± 2.71	< 0.001
CA72-4 (kU/L)	14.15 ± 3.63	7.34 ± 1.25	< 0.001
CEA (μg/L)	14.82 ± 2.16	7.73 ± 1.48	< 0.001
AFP (μg/L)	3.94 ± 0.58	3.26 ± 0.51	0.022

CA19-9: Carbohydrate antigen 19-9; CA72-4: Cancer antigen 72-4; CEA: Carcinoembryonic antigen; AFP: Alpha-fetoprotein.