To Radiate or Not to Radiate? Adjuvant External Beam Radiation Therapy for Nonanaplastic Thyroid Cancer.
To Radiate or Not to Radiate? Adjuvant External Beam Radiation Therapy for Nonanaplastic Thyroid Cancer.
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DOI:
10.1016/j.eprac.2022.03.373
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发表时间:
2022-07
影响因子:
4.2
通讯作者:
Papaleontiou, Maria
中科院分区:
文献类型:
--
作者:
Arida, Abdul Karim;Papaleontiou, Maria
Nonanaplastic thyroid cancers, which include differentiated and medullary thyroid cancers, account for more than 95% of thyroid cancer cases, and the majority are often curable if diagnosed at an early stage. 1 The use of adjuvant external beam radiation therapy (EBRT) following surgery in patients with nonanaplastic thyroid cancers is uncommon because of its treatment-related morbidity and a paucity of evidence from prospective clinical trials on its efficacy. The indications for its use are still controversial. The current guidelines recommend that EBRT should be considered in patients with gross residual disease postoperatively, those with evidence of aerodigestive invasion, and/or those undergoing multiple and frequent operations because of locally advanced disease. 2, 3In view of the available data on EBRT use and outcomes in nonanaplastic thyroid cancer arising solely from single-institution retrospective studies that are subject to selection bias, 4, 5, 6, 7, 8 Hu et al’s 9 study provides important insight on population-based utilization trends and associated outcomes of adjuvant EBRT with curative (not palliative) intent in patients with nonanaplastic thyroid cancer. The study included 57 607 patients with nonanaplastic thyroid cancer identified from the California Cancer Registry who underwent EBRT following surgery between 2003 and 2017, with a median follow-up of 3.1 years. Overall, the utilization of EBRT was low (0.6%), with the highest utilization rate reaching 7.7% in medullary thyroid cancer patients, followed by 1.1% and 0.4% in patients with follicular and papillary thyroid cancers, respectively. Of all the patients treated with EBRT, 28.8% died of their thyroid cancer, compared with 1.3% of those who did not receive EBRT. Compared with the non-EBRT group, a higher proportion of patients in the EBRT group were older, male, had medullary thyroid cancer, a larger tumor size, and more advanced disease. The 10-year cause-specific survival (CSS) for all thyroid cancer patients following EBRT was 61.5%. As expected, 5-and 10-year CSS were better for patients with disease localized in the neck (84.6% and 80.3%, respectively), while the 10-year CSS dropped to 34.4% in patients with distant disease. Patient characteristics, such as older age, and tumor characteristics, such as larger tumor size, extrathyroidal extension, follicular histology, and stage, were associated with a lower 10-year CSS.
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