The use of biomarkers in clinical medicine has been successful in diagnosing tissue damage (cardiac enzyme levels), classifying tumours and assessing their severity (carcinoembryonic antigen and prostate‐specific antigen), and evaluating the risk of atherosclerotic cardiovascular disease risk and response to therapy (blood lipid profile after cholesterol‐lowering medication).45, 46, 47, 48. Here, CEACAM5 is linked to neoplasm.