For the project titled “Assessment of Circulation Immune Suppressor Cells for Predicting Treatment Response in Follicular Cell Derived Thyroid Carcinoma.” In this study, prospectively enrolled patients will have peripheral blood myeloid derived suppressor cells (MDSC) measured before and after therapy for thyroid cancer. This will permit the examination of its role providing new personalized data to patients and their doctors to determine whether the cancer is present or spreading after treatment, in order to aid decisions about treatment or monitoring. Dr. Angell is an Instructor in Medicine at Harvard Medical School and is on the staff of Brigham and Women’s Hospital. He is a graduate of the Keck School of Medicine at the University of Southern California in Los Angeles, where he also completed a residency followed by a fellowship in which he focused on mechanisms of immune suppression in thyroid cancer.