Zhang X, et al. - Authors aim at investigating the efficacy of radioiodine therapy (RAI) for treating patients with pulmonary metastasis from differentiated thyroid cancer (DTC). In addition, they assess independent predictors of its efficacy. As per findings, RAI is an effective treatment for these patients after surgical treatment. Significant predictors for its efficacy include the presence of papillary thyroid cancer, age of < 40 years, the absence of non-lung distant metastasis and female patients.