Abstract Context In clinical trials, osilodrostat (11β-hydroxylase inhibitor) effectively reduced cortisol levels in patients with endogenous Cushing syndrome (CS). Objectives Real-world study (ILLUSTRATE) evaluating osilodrostat use in patients with various etiologies of CS in the United States. Methods Retrospective chart-review study of adults with CS treated with osilodrostat between May 1, 2020 and October 29, 2021. Results 42 patients (Cushing disease, n=34; CS due to adrenal adenoma, n=5; ectopic adrenocorticotropic hormone syndrome [EAS], n=3) were included. Starting doses were 2 mg twice daily (BID) in 27/42 patients (64.3%), maintenance doses were 2 mg BID in 6/9 patients (66.7%) attaining them. During osilodrostat treatment, urinary free cortisol (UFC) decreased below the upper limit of normal (ULN) in 14/20 patients (70.0%) with pre-treatment UFC >ULN. Osilodrostat response was observed across a range of doses (2–20 mg/day). In Cushing disease, median UFC and late-night salivary cortisol decreased from 3.03 and 2.39 × ULN, respectively, to 0.71 and 1.13 × ULN at last assessment in those with available data (n=17 and 8, respectively). UFC decreased in all patients with adrenal CS or EAS with available data (n=2 each). There were no unexpected safety signals; the most common adverse events (incidence ≥20%) were fatigue, nausea, and lower-extremity edema. Glucocorticoid withdrawal syndrome and/or adrenal insufficiency were reported in 12/42 patients (28.6%) after osilodrostat initiation, resulting in treatment discontinuation in four. Conclusion In routine practice with dosing individualized according to clinical condition, response, and tolerability, osilodrostat was effective and well tolerated regardless of CS etiology and severity.
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