CEACAM5 and neoplasm: To prevent or detect a relapse early, clinics use an intense follow-up program for 5 years after the complete resection of the tumor, which includes anamnesis, a physical examination, blood tests, including the search for tumor markers such as carcinoembryonic antigen (CEA) and carbohydrate antigen 19-9 (CA19-9), a colonoscopy, an abdominal ultrasound, a rectoscopy, computed tomography and, a chest X-ray [7].