Ketoconazole Effects on the Daily Cortisol Rhythm in Mild Autonomous Cortisol Secretion

Summary

Background: Cortisol is a hormone in the blood. Cortisol levels normally go down at night and up in the morning. Mild autonomous cortisol secretion (MACS) is a disease in which the body makes too much cortisol. MACS can cause high blood pressure, diabetes, and/or weight gain. Researchers think these problems may be caused by higher cortisol levels at night. Objective: To compare daily cortisol levels in people with MACS with those in healthy people. Also, to test a drug (ketoconazole) that may help lower cortisol levels in people with MACS. Eligibility: People aged 18 years and older with MACS. Healthy volunteers are also needed. Design: Participants with MACS will have a 2-night stay in the hospital. Day 1: A thin tube called a catheter will be inserted into a vein in the arm. Blood will be collected through the catheter every 2 hours starting at 8 PM. Participants will begin a 24-hour urine collection. Saliva will be collected every 6 hours for 24 hours. Day 2: Participants will take 2 tablets of the study drug ketoconazole with their evening meal. Blood will be collected via the catheter at regular intervals throughout the night. Day 3: Participants will leave the hospital in the morning. Healthy volunteers will be screened with a physical exam and blood tests. They will be tested to make sure they do not have MACS. To do this, they will take a drug (dexamethasone) at 11 PM on a day they choose; then they will return the next morning for a blood test. Healthy volunteers will have a 1-night stay in the hospital. They will have blood, urine, and saliva collected for 24 hours.

Timeline

Start

2026-07-23

Primary completion

2027-12-31

Completion

2027-12-31

Publications

• Background Fassnacht M, Tsagarakis S, Terzolo M, Tabarin A, Sahdev A, Newell-Price J, Pelsma I, Marina L, Lorenz K, Bancos I, Arlt W, Dekkers OM. European Society of Endocrinology clinical practice guidelines on the management of adrenal incidentalomas, in collaboration with the European Network for the Study of Adrenal Tumors. Eur J Endocrinol. 2023 Jul 20;189(1):G1-G42. doi: 10.1093/ejendo/lvad066.
• Background Debono M, Harrison RF, Chadarevian R, Gueroult C, Abitbol JL, Newell-Price J. Resetting the Abnormal Circadian Cortisol Rhythm in Adrenal Incidentaloma Patients With Mild Autonomous Cortisol Secretion. J Clin Endocrinol Metab. 2017 Sep 1;102(9):3461-3469. doi: 10.1210/jc.2017-00823.
• Background Saini J, Singh S, Ebbehoj A, Zhang CD, Nathani R, Fell V, Atkinson E, Achenbach S, Rivard A, Singh R, Grebe S, Bancos I. Steroid Profiling and Circadian Cortisol Secretion in Patients With Mild Autonomous Cortisol Secretion: A Cross-sectional Study. J Clin Endocrinol Metab. 2025 Jan 21;110(2):542-553. doi: 10.1210/clinem/dgae468.

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