CONTEXT: Vemurafenib, a selective BRAF inhibitor, appears to have promising clinical activity in patients with papillary thyroid cancer (PTC) harboring the BRAF(V600E) mutation.OBJECTIVE: To determine the efficacy and safety of vemurafenib when used outside of a clinical trial.DESIGN: A retrospective review at MD Anderson Cancer Center.METHODS: The best responses were evaluated using RECIST v1.1.