Table 2. CEA, TAG-72 and FRα are significantly more highly expressed in colorectal tumour tissue than matched normal tissue.

Antigen	Mean normal score	Mean tumour score	P-value
CEA	1.7	12.4	<0.001
TAG-72	2.7	7.8	<0.001
FRα	0.0	0.7	<0.001
EGFR	0.9	1.3	0.08

Abbreviations: CEA=carcinoembryonic antigen; EGFR=Epithelial growth factor receptor; FRα=folate receptor-α; TAG-72=tumour-associated glycoprotein-72.