Global Real World Data in Patients With Advanced Thyroid Cancer on Standard of Care and Specialized Interventions- Registry of Oncologic Outcomes With Testing and Treatment.

Primary Objectives: The primary objective of this study is to compare overall survival (OS) between ATC patients treated at MDA versus outside of MDA using treatment regimens offered at MDA based on BRAF status and stage of the disease. We will gather prospective real-world, large-scale, comprehensive data on these patients who are unable to access traditional clinical trials but are treated with MDA regimens, assigned by stage and BRAF-status. Secondary Objectives: 1. To evaluate effect of chemotherapy, immunotherapy, and radiation therapy on the quality of life for ATC survivors 2. To evaluate how factors such as health insurance and lack of coverage, adherence, and other sociodemographic characteristics influences patient outcomes.