Furthermore, in the comparative quantitative study by Asa et al. [9], in which 46 patients (25 women and 21 men) with medullary thyroid carcinoma were studied during postoperative follow-up, it was shown that the sensitivity and specificity rates of F-DOPA, on a per-patient basis, reached 86.8% and 100%, with a mean calcitonin value of 2031.9 pg/mL and a mean Carcinoembryonic Antigen (CEA) value of 68.3 ng/mL. This evidence concerns the gene CEACAM5 and medullary thyroid gland carcinoma.