CEA was low in the normal (average = 1.49 ng/mL), enteritis (average = 0.95 ng/mL) and polyps group (average = 1.74 ng/mL), but was considerably increased by 17 fold in the CRC group (average = 17.08 ng/mL) (Figure 4E). The gene discussed is CEACAM5; the disease is colorectal carcinoma.