CEACAM5 and neoplasm: A previous study outlining the features of IOPN revealed the main chief complaints with abdominal pain and discomfort, diabetes as comorbidity, no sex differences, the average age at diagnosis of 61 years (range 36–84 years), the tumors tended to occur in the pancreatic head (64%), the average tumor size of 55 mm (range 10–150 mm), and normal tumor markers levels such as CA19-9, CEA, and DUPAN-2 [1, 11].