Rare clinical observation of pronounced response to immunotherapy in a patient with anaplastic thyroid cancer

Anaplastic thyroid cancer is the rarest and the most aggressive form of thyroid cancer. It comprises 1-2 % of all cases and is characterized by rapid growth. median survival of patients with this pathology is about 5 months. Clinical manifestations of the disease are rapid deformation in the neck area, progressive respiratory distress, and dysphagia. The article describes a clinical case of a response of unresectable, BRAF -negative, PD-L1-positive (programmed death-ligand 1) anaplastic thyroid cancer to immunotherapy with pembrolizumab.