CALCA and neoplasm: In preoperative serologic tests, the serum calcitonin level was significantly higher in the tumor recurrence/persistence group (mean 4202.9 ± 15380.3 pg/mL, range 52.3–67633.0 pg/mL) than in the non-recurrence group (mean 277.4 ± 775.9 pg/mL, range 1.5–5790.0 pg/mL) (p = 0.042).