Context: Pituitary corticotroph adenomas are rare tumors that can be associated with excess adrenocorticotropic hormone (ACTH) and adrenal cortisol production, resulting in the clinically debilitating endocrine condition Cushing disease. A subset of corticotroph tumors behave aggressively, and genomic drivers behind the development of these tumors are largely unknown. Objective: To investigate genomic drivers of corticotroph tumors at risk for aggressive behavior. Design: Whole-exome sequencing of patient-matched corticotroph tumor and normal DNA from a patient cohort...