4.7 Article

Follow-up strategy of radiofrequency ablation for papillary thyroid microcarcinoma: defining a response-to-ablation system

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EUROPEAN RADIOLOGY
卷 -, 期 -, 页码 -

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SPRINGER
DOI: 10.1007/s00330-023-10022-6

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Papillary thyroid microcarcinoma; Radiofrequency ablation; Ultrasonography; Disease-free survival

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This study aimed to define a response-to-ablation system based on dynamic risk stratification in order to predict clinical outcomes and guide follow-up strategies for patients with low-risk PTMC who underwent RFA. The study found that the system effectively predicted the risk of LTP and guided ongoing follow-up recommendations, providing a new paradigm for the management of PTMC patients.
ObjectiveTo define a response-to-ablation system based on dynamic risk stratification proposed by the 2015 American Thyroid Association guidelines for predicting clinical outcomes and guiding follow-up strategies for patients with low-risk papillary thyroid microcarcinoma (PTMC) who underwent radiofrequency ablation (RFA).MethodsThis retrospective study reviewed patients with low-risk PTMC who underwent RFA between 2014 and 2018. We classified patients into three groups based on their response to therapy at the 1-year follow-up: complete, indeterminate, and incomplete. The primary endpoints were local tumor progression (LTP) and disease-free survival (DFS).ResultsAmong the 748 patients (mean age, 43.7 years & PLUSMN; 9.8; 586 women), 4.0% (30/748) had LTP during a median follow-up of 5 years. The response was complete in 80.2% (600/748) of the patients, indeterminate in 18.1% (135/748), and incomplete in 1.7% (13/748). The LTP rate in the final follow-up was 1% (6/600), 8.1% (11/135), and 100% (13/13), respectively. The risk of LTP was significantly different in the incomplete response group (HR, 1825.82; 95% CI: 458.27, 7274.36; p < 0.001) and indeterminate response group (HR, 8.12; 95% CI: 2.99, 22.09; p < 0.001) than in the complete response group. There were significant differences in DFS among groups (p < 0.001). The proportion of variation explained and C-index of the system was high (27.66% and 0.79, respectively).ConclusionsWe defined a response-to-ablation system that provides a new paradigm for the management of patients with PTMC who underwent RFA. Our data confirm that the system can effectively predict the risk of LTP and guide ongoing follow-up recommendations.

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