TG and metastatic neoplasm: We excluded 43 (6%) who did not receive radiotherapy in our institution, 33 (5%) who underwent thyroid surgery or had abnormal TSH levels, 29 (4%) who had metastatic diseases (stage IVC), 53 (7%) who experienced tumor progression within one year after radiotherapy, and 148 (20%) who had their thyroid hormones tested in local hospitals but no record could be obtained.