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. 2014 Sep;110(4):375-82.
doi: 10.1002/jso.23656. Epub 2014 Jun 24.

External beam radiotherapy with or without concurrent chemotherapy in advanced or recurrent non-anaplastic non-medullary thyroid cancer

Affiliations

External beam radiotherapy with or without concurrent chemotherapy in advanced or recurrent non-anaplastic non-medullary thyroid cancer

Paul B Romesser et al. J Surg Oncol. 2014 Sep.

Abstract

Background and objectives: To review clinical outcomes and toxicities in locally advanced differentiated thyroid cancer patients treated with external beam radiotherapy (EBRT) with or without concurrent chemotherapy (CCRT).

Methods: Between 1990 and 2012, 66 patients with gross residual/unresectable non-anaplastic non-medullary thyroid cancer were treated with EBRT.

Results: The median overall survival was 42.0 months. The overall locoregional progression-free survival (LPFS) at 3 years was 77.3%. CCRT resulted in a non-significant improvement in LPFS (90.0% vs. 73.0%, P = 0.347). Poorly differentiated histology had significantly improved LPFS (89.4% vs. 66.1%, P = 0.020), despite a significantly worse distant metastasis-free survival (43.9% vs. 82.5%, P = 0.023). Acute treatment-related toxicity included dermatitis, mucositis, and dysphagia with grade three rates of 12.1%, 19.7%, and 16.7%, respectively. The incidence of late toxicity was low. CCRT was only associated with a significant greater rate of acute grade 3 hoarseness (10.0% vs. 0.0%, P = 0.033), but with no difference in the rate of grade 2 late toxicity.

Conclusions: EBRT is a safe and effective treatment modality with 90% LPFS at 3 years in patients with gross residual or unresectable non-anaplastic, non-medullary thyroid carcinoma treated with CCRT. Further incorporation of EBRT with concurrent chemotherapy may result in improved disease control.

Keywords: IMRT; chemoradiation; radiation therapy; thyroid cancer.

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Conflict of interest statement

The authors declared that they have no conflict of interests.

Figures

Fig. 1.
Fig. 1.
Pre-external beam radiation therapy treatment characteristics. RAI, radioiodine.
Fig. 2.
Fig. 2.
A: Locoregional progression-free survival. B:M0 versus M1. C: Well-/moderately differentiated versus poorly differentiated histology. D:External beam radiation therapy (EBRT) versus concurrent chemoradiation therapy (CCRT).
Fig. 3.
Fig. 3.
A: Distant metastasis-free survival. B: Well-/moderately differentiated versus poorly differentiated histology. C: External beam radiation therapy (EBRT) versus concurrent chemoradiation therapy (CCRT).
Fig. 4.
Fig. 4.
A: Overall survival. B: M0 versus M1. C: External beam radiation therapy (EBRT) versus concurrent chemoradiation therapy (CCRT). D: Well-/moderately differentiated versus poorly differentiated histology Presented in part as an oral presentation at the 2nd World Congress on Thyroid Cancer on July 10–14th, 2013 in Toronto, Canada and as a poster at the Multidisciplinary Head and Neck Cancer Symposium on February 20–22, 2014 in Scottsdale, Arizona.

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