External-Beam Radiotherapy for Differentiated Thyroid Cancer Locoregional Control: A Statement of the American Head and Neck Society

This is a clinical practice guideline for patients with differentiated thyroid cancer (DTC). The guideline examines the use of external-beam radiotherapy for locoregional control in patients with gross residual or unresectable disease, and as adjuvant therapy in select patients after complete resection of gross disease. Older patients with high likelihood of microscopic residual disease and low likelihood of responding to radioactive iodine (RAI) are explored in detail. Surgical and RAI considerations regarding locally invasive disease are also discussed.