Diagnostic and economic value of carcinoembryonic antigen, carbohydrate antigen 19-9, and carbohydrate antigen 72-4 in gastrointestinal cancers

Table 4 Correlation analysis of biomarker levels

	Correlation coefficient			P value
	CEA and CA19-9	CEA and CA72-4	CA19-9 and CA724-4	CEA and CA19-9	CEA and CA72-4	CA19-9 and CA724-4
Whole	0.245	-0.005	-0.046	< 0.001	0.359	< 0.001
Gastric cancer	0.291	0.048	0.022	< 0.001	0.342	0.657
Colorectal cancer	0.385	0.2	0.169	< 0.001	< 0.001	< 0.001
Gastrointestinal cancer	0.354	0.164	0.134	< 0.001	< 0.001	< 0.001

P values and correlation coefficients were calculated with Pearson correlation analysis or Spearman correlation analysis. The bold font indicates that the P value was less than 0.05. CEA: Carcinoembryonic antigen; CA19-9: Carbohydrate antigen 19-9; CA72-4: Carbohydrate antigen 72-4.