RecruitingPhase 3Drug trialA Study of AL2846 Capsule Versus Placebo in the Treatment of Advanced Radioiodine-Refractory Differentiated Thyroid CarcinomaThis study aims to demonstrate that, in subjects with locally advanced or metastatic iodine - refractory differentiated thyroid cancer who have failed previous VEGFR - targeted therapy, AL2846 can significantly prolong progression - free survival (PFS) compared with placebo.