TG and metastatic malignant neoplasm in the lymph nodes: The results revealed that the maximum diameter of tumor foci (≤1 cm), unifocal, combination with HT, lymph node metastases rate (≤40%), no postoperative lymph node metastasis, lower level of ps-Tg (≤3.87 ng/mL), and the frequency of 131I therapy (one time) were independent risk factors that positively correlated with the ER achievement (OR: 1.744, 3.114, 3.920, 4.018, 2.074, 9.767, and 49.491, respectively; all p < 0.05).