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

This is a global, multicenter, randomized, double-blind, placebo-controlled phase III study to evaluate the efficacy and safety of dabrafenib plus trametinib in adult patients with locally advanced or metastatic BRAFV600E mutation-positive, differentiated thyroid carcinoma who are refractory to radioactive iodine and have progressed following prior VEGFR targeted therapy. The scientific objective guiding the primary estimand is based on the Progression Free Survival (PFS) as per BIRC assessment using RECIST 1.1 criteria. Patients randomized in the placebo arm for whom disease progression as per RECIST 1.1 is confirmed by Blinded Independent Review Committee (BIRC) and who meet the eligibility criteria outlined in the study protocol will be given the option to crossover to the open-label dabrafenib plus trametinib treatment.