A Study of Enzalutamide Plus the Glucocorticoid Receptor Antagonist Relacorilant Versus Placebo for Patients With High-risk Localized Prostate Cancer

NCT ID: NCT05726292

Last Updated: 2025-02-10

Basic Information

• Recruitment Status: RECRUITING
• Clinical Phase: PHASE2
• Total Enrollment: 90 participants
• Study Classification: INTERVENTIONAL
• Study Start Date: 2025-01-06
• Study Completion Date: 2028-04-01

Brief Summary

Researchers conducting this study hope to learn about the safety and effectiveness of combining two study drugs, relacorilant and enzalutamide, plus androgen deprivation therapy (ADT), also known as hormone therapy. This study is for individuals who have been diagnosed with advanced, high-risk prostate cancer and standard therapies available to treat your disease have not been effective. Participation in this research will last about 3 years and 9 months.

Detailed Description

The purpose of this research is to gather information on the safety and effectiveness of combining two study drugs (relacorilant and enzalutamide) with hormone therapy. Doctors leading this study hope to learn if combining these study drugs with hormone therapy is safe and could improve the results of surgery and delay the time to when prostate cancer tumors spread to other parts of the body in individuals with advanced, high-risk prostate cancer who plan to receive a radical prostatectomy (surgical removal of the whole prostate and surrounding tissue).

Prostate cancer cells usually need hormones (called androgens) to grow. One of these hormones is testosterone, which is mostly produced in the testicles. The usual approach for treating prostate cancer after it progresses involves taking medications to decrease or block the development of hormones (including testosterone) so that prostate cancer cells can't continue to grow. This approach is called androgen deprivation therapy (hormone therapy). Enzalutamide is a hormone-blocking medication, which is a standard of care for prostate cancer when it spreads (metastasizes).

Conditions

Prostate Cancer; Prostate Adenocarcinoma

Study Design

• Allocation Method: RANDOMIZED
• Intervention Model: PARALLEL
• Primary Study Purpose: TREATMENT
• Blinding Strategy: DOUBLE

Study Groups

Group 1: Participants Who Receive Study Drug (Relacorilant) with Hormone Therapy and Enzalutamide

All participants in this group will have surgery up to 4 weeks after receiving enzalutamide/relacorilant with hormone therapy. A radical prostatectomy (removal of the prostate and any surrounding tissue that the surgeon thinks may be affected by the cancer).

Group Type: EXPERIMENTAL

Relacorilant

Intervention Type: DRUG

Relacorilant is an antiglucocorticoid which is under development by Corcept Therapeutics for the treatment of Cushing's syndrome. It is being used in this study as an experimental drug combined with other treatments for prostate cancer.

Enzalutamide

Intervention Type: DRUG

Enzalutamide, sold under the brand name Xtandi, is a nonsteroidal antiandrogen medication which is used in the treatment of prostate cancer.

Androgen Deprivation Therapy

Intervention Type: OTHER

All participants in this study, who meet the requirements to participate, will get Androgen Deprivation Therapy (ADT; a form of hormone therapy) continuously before their radical prostatectomy surgery. As part of this study, ADT consists of one injection every 1-3 months. In this study, ADT is a gonadotropin releasing hormone (GnRH) agonists or antagonist; the choice of which brand of ADT to use is up to your treating physician. GnRH agonists and antagonists are drugs that lower the production of androgens (male hormones) in your body. Prostate cancer cells usually require androgens, such as testosterone, to grow.

Androgen Deprivation Therapy (ADT) has been approved by United Stated Food and Drug Administration (US FDA) to treat patients with prostate cancer but is not approved to treat patients prior to prostatectomy.

Radical Prostatectomy

Intervention Type: PROCEDURE

Radical prostatectomy is surgery to remove the entire prostate gland and surrounding lymph nodes to treat men with localized prostate cancer.

Group 1: Participants Who Receive Placebo (no study drug) with Hormone Therapy and Enzalutamide

All participants in this group will have surgery up to 4 weeks after receiving enzalutamide/placebo (sugar pill in the form of 2 softgel capsules) with hormone therapy. A radical prostatectomy (removal of the prostate and any surrounding tissue that the surgeon thinks may be affected by the cancer).

Group Type: EXPERIMENTAL

Enzalutamide

Intervention Type: DRUG

Enzalutamide, sold under the brand name Xtandi, is a nonsteroidal antiandrogen medication which is used in the treatment of prostate cancer.

Placebo (Sugar Pill)

Intervention Type: OTHER

This would be a sugar pill consisting of 2 softgels. This is not an experimental drug or treatment.

Androgen Deprivation Therapy

Intervention Type: OTHER

All participants in this study, who meet the requirements to participate, will get Androgen Deprivation Therapy (ADT; a form of hormone therapy) continuously before their radical prostatectomy surgery. As part of this study, ADT consists of one injection every 1-3 months. In this study, ADT is a gonadotropin releasing hormone (GnRH) agonists or antagonist; the choice of which brand of ADT to use is up to your treating physician. GnRH agonists and antagonists are drugs that lower the production of androgens (male hormones) in your body. Prostate cancer cells usually require androgens, such as testosterone, to grow.

Androgen Deprivation Therapy (ADT) has been approved by United Stated Food and Drug Administration (US FDA) to treat patients with prostate cancer but is not approved to treat patients prior to prostatectomy.

Radical Prostatectomy

Intervention Type: PROCEDURE

Radical prostatectomy is surgery to remove the entire prostate gland and surrounding lymph nodes to treat men with localized prostate cancer.

Interventions

Relacorilant

Relacorilant is an antiglucocorticoid which is under development by Corcept Therapeutics for the treatment of Cushing's syndrome. It is being used in this study as an experimental drug combined with other treatments for prostate cancer.

Intervention Type: DRUG

Enzalutamide

Enzalutamide, sold under the brand name Xtandi, is a nonsteroidal antiandrogen medication which is used in the treatment of prostate cancer.

Intervention Type: DRUG

Placebo (Sugar Pill)

This would be a sugar pill consisting of 2 softgels. This is not an experimental drug or treatment.

Intervention Type: OTHER

Androgen Deprivation Therapy

All participants in this study, who meet the requirements to participate, will get Androgen Deprivation Therapy (ADT; a form of hormone therapy) continuously before their radical prostatectomy surgery. As part of this study, ADT consists of one injection every 1-3 months. In this study, ADT is a gonadotropin releasing hormone (GnRH) agonists or antagonist; the choice of which brand of ADT to use is up to your treating physician. GnRH agonists and antagonists are drugs that lower the production of androgens (male hormones) in your body. Prostate cancer cells usually require androgens, such as testosterone, to grow.

Androgen Deprivation Therapy (ADT) has been approved by United Stated Food and Drug Administration (US FDA) to treat patients with prostate cancer but is not approved to treat patients prior to prostatectomy.

Intervention Type: OTHER

Radical Prostatectomy

Radical prostatectomy is surgery to remove the entire prostate gland and surrounding lymph nodes to treat men with localized prostate cancer.

Intervention Type: PROCEDURE

Other Intervention Names

Xtandi

Eligibility Criteria

Inclusion Criteria

1. Histologically or cytologically confirmed prostatic adenocarcinoma without primary small cell histology

2. Localized disease:

• Surgical resectability must be documented prior to enrollment
• No evidence of distant metastatic disease on abdominopelvic imaging, bone imaging

• Enlarged lymph nodes below the iliac bifurcation (clinical stage N1) is allowed
• Either cross-sectional abdominopelvic imaging + technetium bone scan or PSMA PET imaging will be acceptable to rule out distant metastatic disease

3. High or very high-risk disease (https://www.nccn.org/professionals/physician_gls/pdf/prostate.pdf) as defined by having one or more of the following:

• Clinical T3a or higher
• Histologic Grade Group 4 or 5
• PSA >20

4. Eastern Cooperative Oncology Group performance status ≤ 1 (Appendix A)

5. Total serum testosterone 100 ng/dL

6. Patients must have normal hepatic function as defined below:

• Total bilirubin <1.5 X the upper limit of normal (note that in subjects with Gilbert's syndrome, if total bilirubin is >1.5 X ULN, measure direct and indirect bilirubin. If direct bilirubin is ≤1.5 X ULN, the subject may be eligible)
• AST(SGOT)/ALT(SGPT) <2.5 X institutional upper limit of normal
• Albumin 3.0 g/dL

7. Patients must have normal bone marrow function as defined below:

• Platelet count (plt) 100,000 /L
• Hemoglobin (Hgb) 10 g/dL
• Absolute neutrophil count (ANC) 1500

8. Patients must have adequate renal function as defined below:

• glomerular filtration rate (GFR) 30 mL/min

9. Ability to understand and the willingness to sign a written informed consent document.

10. Patients with active diabetes mellitus on glucose lowering medications are eligible provided they agree to and are able to self-monitor daily blood glucose levels due to potential risk of lowering glucose levels on relacorilant.

11. Male patient and his female partner who is of childbearing potential must use 2 acceptable methods of birth control (one of which must include a condom as a barrier method of contraception) starting at screening and continuing throughout the study period and for 3 months after final study drug administration. Two acceptable methods of birth control thus include the following:

• Condom (barrier method of contraception) AND
• One of the following is required:

1. Established use of oral, injected or implanted hormonal method of contraception by the female partner;

2. Placement of an intrauterine device (IUD) or intrauterine system (IUS) by the female partner;

3. Additional barrier method: Occlusive cap (diaphragm or cervical/vault caps) with spermicidal foam/gel/film/cream/suppository by the female partner;

4. Tubal ligation in the female partner;

5. Vasectomy or other procedure resulting in infertility (e.g., bilateral orchiectomy), for more than 6 months.

Exclusion Criteria

1. Therapy with ANY hormonal therapy for prostate cancer (prior 5-alpha-reductase inhibitors for benign prostate disease is allowed but must be discontinued prior to study initiation).

2. Inability to swallow capsules or known gastrointestinal malabsorption.

3. History of other malignancies, with the exception of: adequately treated non-melanoma skin cancer, adequately treated superficial bladder cancer, stage 1 or 2 malignancies that are without evidence of disease, or other cancers curatively treated with no evidence of disease for > 5 years from enrollment.

4. Blood pressure that is not controlled despite > 2 oral agents (SBP >160 and DBP >90 documented during the screening period with no subsequent blood pressure readings >160/100).

5. History of seizure disorder or active use of anticonvulsants. Medications used to treat neuropathic pain such as gabapentin or pregabalin are allowed.

6. Serious inter-current infections or non-malignant medical illnesses that are uncontrolled.

7. Active psychiatric illness/social situations that would limit compliance with protocol requirements.

8. New York Heart Association (NYHA) class II, class III, or IV congestive heart failure (any symptomatic heart failure).

9. Concurrent therapy with strong inhibitors of Cytochrome P450 3A4 or CYP2C8 due to concerning possible drug-drug interactions.

10. Concurrent therapy with strong inducers of Cytochrome P450 3A4 due to concerning possible drug-drug interactions.

11. Presence of concurrent medical conditions requiring systemic glucocorticoids for immunosuppression (e.g. autoimmune diseases, organ transplantation) that is active and has required glucocorticoids in the last 6 months.

• Minimum Eligible Age: 18 Years
• Eligible Sex: MALE
• Accepts Healthy Volunteers: No

Sponsors

University of Chicago

OTHER

Sponsor Role: lead

Responsible Party

Responsibility Role: SPONSOR

Principal Investigators

Russell Szmulewitz, MD

Role: PRINCIPAL_INVESTIGATOR

University of Chicago

Locations

University of Chicago Comprehensive Cancer Center

Chicago, Illinois, United States

Site Status: RECRUITING

University of Texas Southwestern Medical Center

Dallas, Texas, United States

Site Status: RECRUITING

Countries

United States

Central Contacts

Cancer Trials

Role: CONTACT

cancerclinicaltrials@bsd.uchicago.edu

1-855-702-8222

Facility Contacts

Cancer Trials

Role: primary

cancerclinicaltrials@bsd.uchicago.edu

855-702-8222

Amy Rowell

Role: primary

amy.rowell@utsouthwestern.edu

214-645-9688

Other Identifiers

IRB22-1318

Identifier Type: -

Identifier Source: org_study_id