CEACAM5 and pancreatic neoplasm: The current diagnosis of pancreatic cancer relies on a combination of medical history and physical examination, serum tumor markers such as carbohydrate 19-9 (CA19-9) and carcinoembryonic antigen (CEA), imaging studies (computed tomography (CT), magnetic resonance imaging (MRI), endoscopic ultrasound (EUS)), and pathological confirmation with a tissue or fluid samples from EUS-fine-needle aspiration (FNA) or pancreatic juice (PJ).