CEACAM5 and neoplasm: Blood tests showed that tumor marker levels were normal (carcinoembryonic antigen [CEA] level of 1.6 ng/ml [normal, < 5.0 ng/ml], cancer antigen 15-3 [CA15-3] level of 7.5 IU/ml [normal, < 25.0 IU/ml], and National Cancer Center-Stomach-439 (NCC-ST-439) level of 1.0 U/ml [normal, < 4.5 U/ml]).