Conclusion
RECURRENCE
To the best of our knowledge, this study is the first to investigate the risk factors for recurrence in both initial treatment and non–initial treatment patients. Compared to existing tools, we developed a simplified and efficient prognostic predictive model based on the following risk factors: age ≥55 years, ENE, LNR >0.5, and non-initial treatment. The identification of these risk factors fills a critical gap in the prognostic tools for the non-initial treatment population. This study will provide useful guidance for individualized treatment and follow-up of patients with PTC, especially for non–initial treatment patients.