Abstract
Papillary thyroid cancer is a very common endocrine malignancy. The 8th American Joint Committee on Cancer/Union for International Cancer Control (AJCC/UICC) staging system introduced major changes. We conducted this retrospective cohort analysis to assess the benefits of radioactive iodine (RAI) according to different stratification of patients. The source of the data was the National Cancer Institute’s Surveillance, Epidemiology, and End Results (SEER) database. From 2006 to 2015, patients with papillary thyroid cancer were included in our study. The interactions between different variables and RAI treatment were tested by multivariate Cox regression models to compare the survival differences according to RAI treatment between the patients assessed with the 7th and 8th edition of the AJCC/TNM staging system. The results of the interaction analysis and group comparisons indicated that the effects of RAI treatment on patients staged with the 7th and 8th editions were similar. Patients with early Stage, early T stage, N0 and subtotal or near total thyroidectomy benefited greatly from RAI treatment. Patients with Stage III according to the 8th edition benefited less from RAI than patients with Stage III according to the 7th edition. Patients with T1a benefited from RAI but benefited less than patients with other T stages. Patients with T3a benefited more from RAI than those with T3b. According to the 8th edition, Stage III/IV more accurately differentiates patients with advanced stage disease. These patients benefitted less from RAI treatment, which may be due to the relatively weaker iodine uptake by tumor cells. T1a patients benefitted less than patients with other T stages. The difference in RAI benefit between patients with T3a and T3b is a novel finding in our study.
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The data in this article are from the SEER database.
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Acknowledgements
This manuscript was reviewed and modified by Andrew Murphy, BSEE, JD, Attorney at Law (P.C. 3601 N. Classen Blvd. #106, Oklahoma City, OK 73118). The manuscript was edited by editors at AJE
Funding
This study was supported by the National Key Clinical Specialty Project (awarded to the Departments of Nuclear Medicine and Radiology). This study was supported by Tian** Medical University General Hospital New Century Excellent Talent Program; Young and Middle-aged Innovative Talent Training Program from Tian** Education Committee; and Talent Fostering Program (the 131 Project) from Tian** Education Committee, Tian** Human Resources and Social Security Bureau (to Zhaowei Meng). This study was also supported by the following grants. China National Natural Science Foundation Grant #81571709 and # 81971650 (to Zhaowei Meng); Key Project of Tian** Science and Technology Committee Foundation Grant #16JCZDJC34300 (to Zhaowei Meng); and Tian** Science and Technology Committee Foundation Grant #17JCYBJC25400 (to Yaguang Fan).
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Liu, X., Fan, Y., Liu, Y. et al. The impact of radioactive iodine treatment on survival among papillary thyroid cancer patients according to the 7th and 8th editions of the AJCC/TNM staging system: a SEER-based study. Updates Surg 72, 871–884 (2020). https://doi.org/10.1007/s13304-020-00773-y
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DOI: https://doi.org/10.1007/s13304-020-00773-y