Overall survival was significantly different between the CIN-1-month positive and CIN-1-month negative patients in both the ‘Higher Baseline CEA’ (9.4 months versus 4.5 months; P-value 0.0006) and ‘Lower Baseline CEA’ (median not reached versus 8.0 months; P-value 0.0003) groups of colorectal cancer patients. Here, CEACAM5 is linked to colorectal cancer.