CEACAM5 and neoplasm: However, all of the patient’s tumor markers were elevated (carcinoembryonic antigen, 14.8 ng/ml; cancer antigen 125, 39.8 U/ml; and cancer antigen 19-9, 500.9 U/ml), and her lactate dehydrogenase, C-reactive protein, and D-dimer levels were also increased, which were believed to be effects of the tumor.