Table 2.

Results of meta-analysis for CA15-3 and CEA using malignant and benign tumor database.

Biomarker	Analysis method	Heterogeneity		Odd ratio (OR)				Publication bias
		I2 (%)	p-value	Overall	Lower	Upper	p-value	Begg	Egger
Malignant
CA15-3	Random	98.6	3.7×10−30	2.15	2.00	2.30	1.8×10−10	0.149	1.0×10−5
CEA	Random	97.4	3.1×10−25	1.23	1.09	1.36	1.8×10−21	0.020	0.149
Benign**
CA15-3	Random	98.8	2.2×10−18	0.17	−0.21	0.54	0.382	–*	–*

^*Results are not available because there were too few studies;

^**Analysis on CEA was not performed due to the lack of studies.