%0 Guideline %T The University of Florida Department of Radiation Oncology Guidelines for Treatment of Differentiated Thyroid Cancer With I-131 or External-beam Radiotherapy. %A Amdur RJ %A Dagan R %J Am J Clin Oncol %V 42 %N 1 %D 01 2019 %M 29727314 %F 2.787 %R 10.1097/COC.0000000000000455 %X The purpose of this paper is to summarize the University of Florida Department of Radiation Oncology guidelines for treatment of differentiated thyroid cancer with I-131 or external-beam radiotherapy. This article is not meant to compete with the many excellent book chapters and consensus guidelines that present comprehensive discussions of treatment options. This is a streamlined, "How we do it?" reference without substantial discussion of background or supporting data. To serve as a treatment reference, the great majority of the information is presented in topic-specific tables.