Due to arguments showing that angiogenesis could be involved in progression of metastatic thyroid carcinoma and to objective response during a phase I trial with sunitinib, it was justified to evaluate in a prospective trial the efficacy of sunitinib in metastatic thyroid carcinoma. Furthermore, the standard treatment of metastatic thyroid carcinoma when a general treatment is to be prescribed is limited to radioiodine. When radioiodine becomes ineffective, there is no standard treatment despite some usage of chemotherapy.