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.

The goal of this clinical research study is to learn about the barriers in the real world to accessing treatments for ATC. And to learn about how patients with ATC tolerate and respond to the commercially available medications for treatment of this disease, outside of a clinical study.

Inclusion Criteria: All adult patients aged 18 years or older (with the exception of certain external participant countries where the legal adult age may be different; for example in Singapore, adult majors are defined by age 21 and older) with anaplastic thyroid cancer or poorly differentiated thyroid cancer as their clinical and/ or histological diagnosis will be included. Exclusion Criteria: Patients who do not have anaplastic thyroid cancer or poorly differentiated thyroid cancer on their tumor tissue would be excluded.