History, physical examination, CEA and CT (or MRI) are recommended after 2–3 months during palliative chemotherapyPatients to be re‐evaluated every 2–3 months if chemotherapy is continuedNo evidence for the evaluation using PETIn patients who had complete resection of metastatic disease, more intensive follow‐up should be consideredCEA and CT at intervals of 3–6 months during the first 3 years can be recommended. Here, CEACAM5 is linked to metastatic neoplasm.