CDC73 and Neoplasm of the endocrine system: Mutations within genes that regulate other functions and that have been associated with the occurrence of endocrine neoplasia, such as cell division cycle 73 (CDC73), and aryl hydrocarbon receptor-interacting protein (AIP), among others, may also be found among patients with parathyroid and/or pituitary tumors (4, 12, 13, 15).