CEACAM5 and cancer: Blood tests showed an elevated level of serum creatinine (196 μmol/l) and serum tumor markers, cancer antigen (CA)125 (168 U/ml; reference range, <35 U/ml), carcinoembryonic antigen (CEA; 15.3 ng/ml; reference range, <5.0 ng/ml) and CA153 (68 U/ml; reference range, <25 U/ml) and a urine test was negative.