Metyrapone for Mild Autonomous Cortisol Secretion (MACS)

Study Overview
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Brief Summary
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The purpose of this study is to find out whether the study drug, metyrapone, is safe and effective in treating participants with Mild Autonomous Cortisol Secretion (MACS).

Detailed Description
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This study will look at how well metyrapone controls blood pressure, blood glucose, blood lipids and weight. Metyrapone is approved in the United States of America (USA) by the Federal Drug Administration (FDA) for use in the diagnosis of adrenal insufficiency. It is not approved in the USA for the treatment of MACS. It is approved in Europe for the treatment of ACTH dependent Cushing's Syndrome. Metyrapone is currently being tested to evaluate the safety (side effects/risks) and efficacy (benefits), so its use for the treatment of MACS is experimental in the USA. Its effectiveness is unproven in the USA and metyrapone is considered an investigational study drug in the USA. The Mayo Clinic IRB has given approval for this drug to be used in this setting. Patients diagnosed with MACS have abnormal cortisol levels above the normal range. Cortisol acts by binding with the cortisol receptors in many tissues of the body. Metyrapone works by reducing cortisol production, thereby decreasing the effects of too much cortisol. Metyrapone doesn't affect levels of other hormones in your body.

Official Title
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Metyrapone Intervention in Patients With Mild Autonomous Cortisol Secretion (MACS)

Conditions
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Autonomous Cortisol Secretion, Mild Autonomous Cortisol Secretion (MACS)

Intervention / Treatment
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* Drug: Metyrapone


Participation Criteria
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Eligibility Criteria
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Inclusion Criteria: Provide written informed consent. Stated willingness to comply with all study procedures and availability for the duration of the study. Diagnosed with MACS: at least 2 abnormal post-dexamethasone cortisol results (1 mg post-dexamethasone cortisol > 1.8 mcg/d; or 8 mg post-dexamethasone cortisol > 1 mcg/dL) and historical dexamethasone suppression test results can be used if performed within 24 months prior to enrollment. Adrenal imaging phenotype consistent with benign disease (adrenal adenoma/s, macronodular or micronodular adrenal hyperplasia). At least one of the following comorbidities: obesity (BMI > 30 kg/m^2); dysglycemia; dyslipidemia; hypertension; osteopenia; osteoporosis; fragility fractures. Ability to take oral medication and be willing to adhere to the study intervention regimen. For females of reproductive potential: use of highly effective contraception initiated prior to baseline visit and for 1 month after completing metyrapone study. For persons of childbearing potential: agreement to remain abstinent (refrain from heterosexual intercourse) or use a contraceptive method with a failure rate of <5% per year during the treatment period and for 6 months after the last dose of study treatment. Stable timing for bedtime for at least one week prior to on-site study visits Exclusion Criteria: Planned alternative therapy for MACS within 6 months after joining the study. Current use of oral exogenous glucocorticoid therapy. Current use of opioid therapy > 20 MME/day. Planned use of oral exogenous glucocorticoid therapy. Planned use of opioid therapy > 20 MME/day. Use of injectable glucocorticoid within the last 6 weeks. Investigator's judgement based on history/physical examination that a comorbidity or concomitant medication may impact the hypothalamic-pituitary-adrenal axis or steroid metabolome. Uncontrolled intercurrent illness including, but not limited to: ongoing or active infection; symptomatic congestive heart failure; unstable angina pectoris; cardiac arrhythmia; psychiatric illness/social situations that would limit compliance with study requirements. Pregnancy or lactation. Known allergic reactions to metyrapone. Suspected false positive post-dexamethasone cortisol results due to increased metabolism, poor absorption, or noncompliance with dexamethasone. Treatment with another investigational drug or other intervention within lower than specific therapy washout period.

Ages Eligible for Study
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Minimum Age: 18 Years

Sexes Eligible for Study
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All

Accepts Healthy Volunteers
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No

Study Plan
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How is the study designed?
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Design Details

Primary Purpose: Treatment
Intervention Model: Single Group Assignment
Masking: None (Open Label)


Arms and Interventions

| Participant Group/Arm | Intervention/Treatment |
| --- | --- |
| Experimental: Mild Autonomous Cortisol Secretion (MACS) Open Label Phase and Optional Extension Phase<br>Subjects diagnosed with Mild Autonomous Cortisol Secretion (MACS) will receive metyrapone for a 6 month treatment period (Open Label Phase) with the option to continue for an additional 30 months of metyrapone therapy. If a patient chooses to participate in the Optional Extension Phase they will continue to receive metyrapone therapy until Month 36. This is an additional 30 months of therapy after completion of the Open Label Phase. | Drug: Metyrapone<br>* 250 to 1000 milligram (mg) orally in one or two doses in the evening (administered 4 and 2 hours prior to bed)<br>|

What is the study measuring?
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Primary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| Adverse Events | Number of participants to experience adverse events | 50 months |