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Randomized Trial of Osilodrostat for the Treatment of Cushing Disease

Abstract:

Context: Cushing disease, a chronic hypercortisolism disorder, is associated with considerable morbidity and mortality. Normalizing cortisol production is the primary treatment goal. Objective: We aimed to evaluate the safety and efficacy of osilodrostat, a potent, orally available 11βhydroxylase inhibitor, compared with placebo in patients with Cushing disease. Methods: LINC 4 was a phase III, multicenter trial comprising an initial 12-week, randomized, double-blind, placebo-controlled (osilodrostat:placebo, 2:1) period followed by a 36-week, open-label treatment period (NCT02697734). Adult patients (aged 18-75 years) with confirmed Cushing disease and mean urinary free cortisol (mUFC) excretion1.3 times the upper limit of normal (ULN) were eligible. The primary endpoint was the proportion of randomized patients with mUFC≤ULN at week 12. The key secondary endpoint was the proportion achieving mUFC≤ULN at week 36 (after 24 weeks' open-label osilodrostat). Results: Seventy-three patients (median age, 39 years [range, 19-67]; mean/median mUFC, 3.1×ULN/2.5×ULN) received randomized treatment with osilodrostat (n=48) or placebo (n=25). At week 12, significantly more osilodrostat (77%) than placebo (8%) patients achieved mUFC≤ULN (odds ratio 43.4; 95% CI 7.1, 343.2; P<0.0001). Response was maintained at week 36, when 81% (95% CI 69.9, 89.1) of all patients achieved mUFC≤ULN. The most common adverse events during the placebo-controlled period (osilodrostat vs placebo) were decreased appetite (37.5% vs 16.0%), arthralgia (35.4% vs 8.0%), and nausea (31.3% vs 12.0%). Conclusion: Osilodrostat rapidly normalized mUFC excretion in most patients with Cushing disease and maintained this effect throughout the study. The safety profile was favorable.