CEACAM5 and medullary thyroid gland carcinoma: Finally, in the most recent 15-year quantitative study in which 109 patients with MTC were studied, F-DOPA PET/CT was of great value for diagnosis and postoperative evaluation, with sensitivity and specificity rates of 95% and 93%, respectively, a mean calcitonin value of 1808 pg/mL, and a mean CEA value of 4 μg/L [27].