In terms of the biohumoral markers, the carcinoembryonic antigen (CEA) and carbohydrate antigen (CA 19-9) levels were as follows: 2 ng/ml; CA 19-9, 14 U/ml; however, an above upper limit level of chromogranin A could have allowed a differential diagnosis of a primary pancreatic neuroendocrine tumor. The gene discussed is CEACAM5; the disease is pancreatic neuroendocrine tumor.