For most patients with CD, primary treatment is transsphenoidal surgery to remove the pituitary adenoma. However, success rates are variable (reported as 65 to 90 %) and dependent on the surgeon’s expertise [11]. Published 5- and 10-year recurrence rates are as high as 25 and 56 %, respectively [12, 13], and many patients develop deficiencies of other pituitary hormones post-surgery [11]. Patients who fail to achieve or maintain remission require secondary treatment, including radiotherapy and/or adrenalectomy—both of which are associated with subsequent hormone deficiencies [11]. Thus, additional treatment options for patients with CD are required.