Effect of Hashimoto’s Thyroiditis on Efficacy of <sup>131</sup>I Ablation Therapy in Intermediate- and High-Risk of Thyroid Papillary Carcinoma

Objective: The purpose of this study was to investigate the effect Hashimoto’s thyroiditis on efficacy 131I ablation in intermediate- and high-risk thyroid papillary carcinoma patients. findings will help develop a personalized treatment plan for patients with complicated thyroiditis. Material Methods: From January 2016 December 2020, who were diagnosed PTC lymph node metastasis analyzed retrospectively, excluding incomplete clinical data, distant metastasis, positive TGAb, TSH outcome. Results: A total 525 (166 males 359 females) included study, including 368 ER group (70.1%) 157 NER (29.9%). Eleven factors combining thyroiditis, pre-ablative Tg levels, sex, tumor diameter, extraglandular invasion, multifocal, bilateral lesions, central lateral rate, thyroglobulin statistically different between significance at P carcinoma. high Ps-Tg level increased number reduce therapy intermediate risk