Parathyroid Cancer Versus Atypical Parathyroid Neoplasm; Investigating Their Clinical Characteristics and Biological Behavior

Data between the years of 1/1/2002 and 12/31/2013 will be analyzed. The medical records of all adult patients that had a parathyroidectomy for primary PHPT in MD Anderson Cancer Center will be screened in order to identify patients that had a histopathological diagnosis of parathyroid carcinoma or atypical parathyroid neoplasm.