The FNA-Ct/serum calcitonin ratios in the MTC nodules of the MTC patients ranged from 0.48 to 2583 pg/mL (median 212.0 pg/mL), and those ratios in the non-MTC nodules of the MTC patients ranged from 0.009 to 39.0 pg/mL (median 0.25) (Fig. 4). The gene discussed is CALCA; the disease is medullary thyroid gland carcinoma.