CEACAM5 and anemia: Laboratory investigations revealed mild anemia (hemoglobin: 10.2 g/dL) and elevated carbohydrate antigen 19-9 (CA19-9) levels at 115.8 U/mL (normal: <37 U/mL), while carcinoembryonic antigen (CEA) levels were within normal limits at 2.6 ng/mL (normal: <5 ng/mL).