TG and neoplasm: All other variables were risk factors, including age >55 years old (RR = 1.48, p < 0.01), number of tumors >2 (RR = 1.42, p < 0.01), max tumor size >2 cm (RR = 1.64, p < 0.01), high‐risk of recurrence (RR = 6.61, p < 0.001), central lymph node dissection only (RR = 1.57, p < 0.001), and pre‐ablative Tg level >2 ng/ml (RR = 4.06, p < 0.001).