CEACAM5 and colorectal adenocarcinoma: A 79 years old man was evaluated in our tertiary referral centre in 2018 for persistently high Carcinoembryonic Antigen (CEA) levels (up to 63.3 ng/mL), observed during the follow-up for a history of colorectal adenocarcinoma (pT3pN2aM0, stage IIIB [6]), previously classified as recovered in 2017, after surgery and adjuvant chemotherapy.