NCT05804669 · Crinetics Pharmaceuticals Inc.
A Study to Evaluate the Safety and PK of CRN04894 for the Treatment of Cushing's Syndrome
What this study is about
A Phase 1b/2a, first-in-disease, where both patients and doctors know the treatment given, multiple-ascending dose exploratory study to evaluate safety, tolerability, how the drug moves through the body (PK), and how the drug affects the body biomarker responses associated with CRN04894 (an adrenocorticotropic hormone \[ACTH\] receptor antagonist) in participants with ACTH-dependent Cushing's syndrome (Cushing's disease or Ectopic ACTH Syndrome \[EAS\])
View original scientific description
A Phase 1b/2a, first-in-disease, open-label, multiple-ascending dose exploratory study to evaluate safety, tolerability, pharmacokinetics (PK), and pharmacodynamic biomarker responses associated with CRN04894 (an adrenocorticotropic hormone \[ACTH\] receptor antagonist) in participants with ACTH-dependent Cushing's syndrome (Cushing's disease or Ectopic ACTH Syndrome \[EAS\])
Who can participate
This study lists these criteria on ClinicalTrials.gov. A study coordinator reviews eligibility during screening — this page does not determine whether you qualify.
Inclusion criteria
- Adult male or female, aged 18 years or more
- Evidence of chronic 'active' ACTH-dependent Cushing's syndrome
- Evidence of acutely 'active' ACTH-dependent Cushing's syndrome within 10 days of Day 1
- Participants with documented ACTH-dependent Cushing's syndrome taking short-acting steroidogenesis inhibitors (ketoconazole, levoketoconazole, osilodrostat, or metyrapone) may participate after a washout period of at least 5 days, if they meet other study inclusion criteria, relative to Investigator's judgment. Participants with documented ACTH-dependent Cushing's syndrome taking cabergoline may participate after a washout period of at least 14 days, if they meet other study inclusion criteria
Exclusion criteria
- Women who are pregnant or lactating
- History of bilateral adrenalectomy
- Previous pituitary MRI findings of a putative ACTH-secreting lesion within 3 mm of the optic chiasm
- Presence of any known malignancy
- Use of mitotane
- Previous unsuccessful surgery for Cushing's syndrome within 6 weeks
Where
- Bethesda, Maryland
Frequently asked questions
What is a clinical trial?
A clinical trial is a research study that tests new medical treatments, drugs, devices, or procedures to determine their safety and effectiveness. Trials are carefully designed and monitored to protect participants while advancing medical knowledge.
Is it safe to participate?
Clinical trials follow strict safety guidelines and ethical standards. Trials must be reviewed and approved, and participants are closely monitored by medical professionals throughout the study. You can withdraw at any time if you choose.
Will I be compensated?
Many clinical trials offer compensation for your time, travel expenses, and inconvenience. The specific compensation varies by study and will be discussed during the screening process. All study-related medical care is typically provided at no cost to participants.
Will I receive a placebo instead of treatment?
When effective treatment exists, participants typically receive either the standard treatment plus the study intervention, or the standard treatment plus placebo. You would not be denied effective care. Placebos are primarily used when no proven treatment is available, or in addition to standard care. Your trial consent form will clearly explain what treatments you may receive.
Can I leave a trial if I change my mind?
Absolutely. Participation in clinical trials is completely voluntary. You have the right to withdraw from the study at any time, for any reason, without penalty or loss of benefits to which you are otherwise entitled.
How long does a clinical trial last?
Trial duration varies widely depending on the study design and purpose. Some trials last just a few weeks, while others may continue for months or years. The study coordinator will provide specific timeline information during your screening call.
Data: ClinicalTrials.gov · synced Jun 4, 2026 · Source of record for eligibility and locations