Table 2: Evaluation of Diagnostic Value of CEA and VEGF

	CEA (3.8 ng/ml)	VEGF (12.84 ng/ml)	CEA & VEGF (3.8 ng/ml; 12.84 ng/ml)
Specificity	85.7%	71.4%	81.4%
Sensitivity	58.3%	63%	66.67%
Positive predictive value	95.4%	89.5%	88%
Negative predictive value	28.5%	33.3%	28%