CEACAM5 and cancer: The CEA levels were significantly elevated in cancer groups compared to the controls (p < 0.001), with median (IQR) values of 1.34 (1.06–2.00) in the controls, 4.86 (2.58–9.40) in rPDAC, and 7.74 (3.66–25.6) in mPDAC patients.