Except for a slightly increased serum chromogranin A (CgA) of 6.7 nmol/l (normal, <3.5 nmol/l), other tumor markers were normal including carcinoembryonic antigen (CEA) (2 μg/l; normal, <5 μg/l) and carbohydrate antigen 19–9 (CA 19–9) (5 kU/l; normal, <60 kU/l). Here, CEACAM5 is linked to neoplasm.