{Reference Type}: Guideline {Title}: The University of Florida Department of Radiation Oncology Guidelines for Treatment of Differentiated Thyroid Cancer With I-131 or External-beam Radiotherapy. {Author}: Amdur RJ;Dagan R; {Journal}: Am J Clin Oncol {Volume}: 42 {Issue}: 1 {Year}: 01 2019 {Factor}: 2.787 {DOI}: 10.1097/COC.0000000000000455 {Abstract}: 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.