The cytology report was “malignant; MTC.” However, the serum calcitonin and CEA levels (< 0.05 pg/mL, 4.3 ng/mL) showed no increase; moreover, the calcitonin stimulation tests were unresponsive (3 min 6.46 pg/mL, 5 min 4.99 pg/mL). This evidence concerns the gene CALCA and medullary thyroid gland carcinoma.