Study of Efficacy and Safety of Dabrafenib in Combination With Trametinib in Previously Treated Patients With Metastatic, Radio-active Iodine Refractory BRAF V600E Mutation Positive Differentiated Thyroid Cancer

Key Inclusion Criteria: * Signed informed consent * Male or female ≥ 18 years of age at time of informed consent * Histologically or cytologically confirmed diagnosis of advanced/metastatic differentiated thyroid carcinoma * Radioactive-iodine refractory disease * BRAF V600E mutation-positive tumor sample as per central laboratory result * Has progressed on at least 1 but not more than 2 prior VEGFR targeted therapies * Eastern Cooperative Oncology Group (ECOG) performance status ≤ 2 * At least one measurable lesion as defined by RECIST v1.1. Key Exclusion Criteria: * Anaplastic or medullary carcinoma of the thyroid * Previous treatment with a BRAF inhibitor and/or a MEK inhibitor * Concomitant RET Fusion-Positive Thyroid Cancer * Treatment with any type of small molecule kinase inhibitor (including investigational kinase inhibitor) within 2 weeks before randomization * Treatment with any type of anticancer antibody (including investigational antibody) or systemic chemotherapy within 4 weeks before randomization * Treatment with radiation therapy for bone metastasis within 2 weeks or any other radiation therapy within 4 weeks before randomization * A history or current evidence/risk of retinal vein occlusion (RVO) or central serous retinopathy Other inclusion/exclusion criteria may apply.