CEACAM5 and colorectal carcinoma: In their study of 623 CRC patients, elevated CEA (≥5 ng/mL) was a predictor of recurrence (HR, 1.8; 95% CI, 1.09–3.00; p = 0.002) and of OS (HR, 7.79; 95% CI, 1.00–3.19; p = 0.046) [28].