CEACAM5 and neoplasm: Outpatient clinic follow‐up revealed normal tumor markers and CT scan findings indicating no evidence of recurrence (carcinoembryonic antigen, 0.9 ng/mL; carbohydrate antigen 19–9, 2.9 IU/mL) for more than 1.5 years since the primary rectal tumor was resected (Figure 4).