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AzTrials

Biochemically Recurrent Prostate CancerPhase 2ARAMONNCT05526248

A Study Called ARAMON to Learn to What Extent Does Study Treatment With Darolutamide Affects Testosterone Levels in Men With Prostate Cancer That Had Not Been Treated With Hormonal Therapy Compared to Treatment With Enzalutamide

A Phase 2 study testing Darolutamide(BAY1841788, Nubeqa) and Enzalutamide in people with Biochemically Recurrent Prostate Cancer, run by Bayer at 5 sites in United States.

Completed

Finished. The study has ended and is not enrolling. Results may be posted on the official record.

Official record
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Trial summary

Researchers are looking for a better way to treat men who have biochemically recurrent hormone-naïve prostate cancer. Hormone-naïve prostate cancer is a prostate cancer that has not yet been treated with hormonal therapy including androgen deprivation therapy (ADT). Read more about this study

Who is it for?
Ages 18 years and older, men only
Conditions the study is for
Biochemically Recurrent Prostate Cancer
What is being tested?
Darolutamide(BAY1841788, Nubeqa) and Enzalutamide
Type of treatment
Pill or oral medicine
Could I receive a placebo?
No, everyone receives an active treatment
How many people
28 participants
Where
5 sitesUnited States
Study dates
19 Dec 2022to 4 Dec 2024
Phase
Phase 2
Are there results?
Yes, posted in the registrySummary in the doctors' view

Key requirements

Who can take part, as listed by the sponsor. Only the study team can confirm whether you are eligible, so take this list to your doctor.

  • Ages 18 years and older
  • Men only
  • No healthy volunteers
  • Adult, Older adult

Who may be able to join

  • Male of ≥ 18 years of age.
  • Patients must have histologically or cytologically confirmed adenocarcinoma of the prostate.
  • Prior treatment with primary radical prostatectomy or definitive RT for localized prostate cancer
  • Patients must have PSA ≥0.2 ng/mL after ART or SRT post-RP or after RP in participants who are unfit for ART or SRT, OR PSA ≥2 ng/mL above the nadir after primary RT only. (RP, radical prostatectomy; ART, adjuvant radiotherapy; SRT, salvage radiotherapy; RT primary radiotherapy)
  • The presence of < 5 asymptomatic metastatic lesions on conventional or PSMA-PET based imaging methods permitted. Lesions that need treatment with any opioid based analgetic are considered symptomatic
  • PSADT ≤ 20 months calculated per PCWG3 + RECIST 1.1 per Scher et al. (Scher et al. 2016) and MSKCC nomogram.
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  • Eastern Cooperative Oncology Group ECOG (PS) of 0 - 1.
  • Serum testosterone >150 ng/dl.
  • Patients must have adequate organ function within 4 weeks before the first dose of study intervention.
  • More than 30 days (or 5 half-lives) (whichever is longer) since prior participation in another clinical trial with an investigational medicinal product.

Who cannot join

  • Prior treatment with ADT of up to 6 months for localized disease is permitted but not if during the prior 6 months before first dose of study intervention. Plan to initiate ADT during the trial period is not allowed.
  • Radiation therapy or major surgery within 4 weeks of screening.
  • Systemic glucocorticoids within 3 months prior to the first dose or study intervention was expected to require systemic glucocorticoids during the study period
  • Had any of the following within 6 months before randomization: stroke, myocardial infarction, severe/unstable angina pectoris, coronary/peripheral artery bypass graft, congestive heart failure (New York Heart Association Class III or IV)
  • Uncontrolled hypertension
  • A gastrointestinal disorder or procedure which is expected to interfere significantly with absorption of study intervention.
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  • Prior history of a clinically significant malignancy with the exception of basal cell, squamous cell carcinoma of the skin, and superficial bladder cancer.
  • Prior treatment with:
  • Second-generation androgen receptor (AR) inhibitors such as enzalutamide, apalutamide, darolutamide other investigational AR inhibitors
  • or Cytochrome P17 enzyme inhibitor such as abiraterone acetate as antineoplastic treatment for prostate cancer
  • Prior history of gynecomastia
  • Use of herbal products that may have had hormonal anti-prostate cancer activity or were known to decrease PSA levels (e.g., saw palmetto) within 4 weeks before the first dose of study intervention

Trial locations and contacts

5 sites in 1 country.

5 sites in 1 country

United States5 sites
  • Mass General Cancer Center

    Boston, Massachusetts, 02114-2696

  • Beth Israel Deaconess Medical Center - Oncology

    Boston, Massachusetts, 02215

  • Central Ohio Urology Group - Gahanna

    Gahanna, Ohio, 43230

  • Memorial Sloan Kettering Cancer Center New York - Main Campus

    New York, New York, 10065

  • Unio Specialty Care - Urology - Sherman Oaks

    Sherman Oaks, California, 91411

Other trials in United States

About this study

Official title: A 2-stage, Lead-in and Randomized, Phase 2, Open-label Study of Darolutamide Versus Enzalutamide as Monotherapy on Testosterone Levels Change in Men With Hormone-Naïve Prostate Cancer

Researchers are looking for a better way to treat men who have biochemically recurrent hormone-naïve prostate cancer.

Hormone-naïve prostate cancer is a prostate cancer that has not yet been treated with hormonal therapy including androgen deprivation therapy (ADT). Biochemically recurrence (BCR) means that patients who received local treatment (surgery or radiation therapy) for prostate cancer now present with a rise in the blood level of a specific protein called PSA (prostate-specific antigen) but no detectable cancer or cancer spreading after a treatment that aimed to cure their prostate cancer (e.g. surgery and radiation). This may mean that the cancer has come back as the PSA level can be taken as a marker for prostate cancer development. Although men with BCR may not have symptoms for many years, proper treatment for BCR is important as the cancer may spread to other parts of the body in 7-8 years.

Read more

In prostate cancer patients, male sex hormones like testosterone (also called androgens) can sometimes help the cancer spread and grow. To reduce androgen levels in these patients, androgen deprivation therapy (ADT) is often used.

Second generation androgen receptor inhibitors including Darolutamide and Enzalutamide are available for the treatment of prostate cancer in addition to ADT. These inhibitors work by blocking androgen receptors and preventing it from attaching to proteins in cancer cells in the prostate. It is already known that men with prostate cancer benefit from these treatments. But besides benefits, Darolutamide and Enzalutamide are not without side effects.

Clinical studies have shown that treatment with Enzalutamide increase testosterone level in serum, probably because it can pass blood brain barrier and goes into the central nervous system (CNS). The increased testosterone levels are thought to cause some specific side effects including so called feminizing side effects like overdevelopment of the breast tissue in men, and breast tenderness. Darolutamide has a distinct chemical structure and reduced ability to enter the CNS compared with Enzalutamide. That means that Darolutamide potentially leads to fewer and less severe side effects than Enzalutamide.

In this study researchers will collect more data to learn to what extent Darolutamide affects serum testosterone levels in men with BCR in hormone-naïve prostate cancer. This study will consist of 2 stages. In stage 1 (also called lead-in phase) all participants will take Darolutamide by mouth twice a day. The study team will monitor and measure testosterone levels in the blood after:

  • 12 weeks
  • 24 weeks and
  • 52 weeks of treatment.

The second stage (also called randomized phase) is conditional and depends on the results from the stage 1. It will be conducted if after 24 weeks of treatment with Darolutamide in stage 1:

  • a mean change in blood testosterone levels is below 45% and
  • if the feminizing side effects (including overdevelopment of the breast tissue in men, and breast tenderness) will occur less frequently than previously reported.

In the second stage of this study all participants will be randomly (by chance) assigned into two treatment groups, taking either Darolutamide twice daily or Enzalutamide once daily by mouth for a minimum of 12 and a maximum of 52 weeks.

During both stages of this study the study team will:

  • do physical examinations
  • take blood and urine samples
  • examine heart health using ECG
  • examine heart and lung health using CPET
  • check bone density using x-ray scan (DEXA)
  • check vital signs
  • check if the participants' cancer has grown and/or spread using CT (computed tomography) or MRI (magnetic resonance imaging) and, if needed, bone scan
  • ask the participants questions about how they are feeling and what adverse events they are having.

An adverse event is any medical problem that a participant has during a study. Doctors keep track of all adverse events that happen in studies, even if they do not think the adverse events might be related to the study treatments.

The study participants who receive Darolutamide in stage 2 can continue to receive their treatments as long as they benefit from the treatment. The participants from the Enzalutamide group can also switch to treatment with Darolutamide after finishing stage 2. The study team will continue to check the participants' health and collect information about medical problems that might be related to Darolutamide until up to 30 days of last dose for those participants who continue on treatment with Darolutamide.

Being tested
Darolutamide(BAY1841788, Nubeqa), Enzalutamide
Keywords
Hormone-naive prostate cancer

What participants receive

What participants receive. In a randomised study each person is assigned to one group by chance.

  • Darolutamide(BAY1841788, Nubeqa)Drug

    tablet, oral

  • EnzalutamideDrug

    tablet, oral

Study groups in NCT05526248
Study groupRoleWhat they receive
Lead-in phase: Darolutamide treatmentExperimentalDarolutamide treatment arm is single cohort in lead-in phase.
Receives: Drug: Darolutamide(BAY1841788, Nubeqa)
Randomized phase: Darolutamide treatmentExperimentalThe conduct of the randomized phase is dependent on the results of the lead-in phase.
Receives: Drug: Darolutamide(BAY1841788, Nubeqa)
Randomized phase: Enzalutamide treatmentActive comparatorThe conduct of the randomized phase is dependent on the results of the lead-in phase.
Receives: Drug: Enzalutamide

What is being measured

The primary outcome is the main question the study is designed to answer.

  1. Percent Change in Serum Testosterone

    Measured: From baseline to week 12

Secondary outcomes (2)
  1. Percent Change in Serum Testosterone

    Measured: From baseline to week 24 and 52

  2. Number of Participants With Different Serum Prostate-specific Antigen (PSA) Response

    PSA50 is defined as a ≥50% reduction of the PSA level compared to the baseline value, confirmed by a second subsequent PSA value with a ≥50% reduction from baseline 3 or more weeks later.

    Measured: At week 4.12.24.36.52

Timeline

From the start of the study to its completion; the mark is today. Estimated dates are the sponsor’s plan.

  1. First posted2 Sep 2022
  2. Study start19 Dec 2022
  3. Primary completion20 Aug 2024
  4. Study completion4 Dec 2024

Resources

More details

For doctors and researchers: how the study is designed, who runs it, and its registry IDs.

Study design
Study type
Interventional
Phase
Phase 2
Primary purpose
Treatment
Allocation
Randomised
Intervention model
Parallel groups
Masking
None (open label)
Enrolment
28 participants (actual)
IDs, dates and publications
ClinicalTrials.gov ID
NCT05526248
Sponsor's protocol ID
21953
Acronym
ARAMON
Status last verified
Feb 2026
First submitted
31 Aug 2022
Last updated
11 Mar 2026
Data monitoring committee
No
FDA-regulated drug
Yes
FDA-regulated device
No
Individual data sharing
No: Availability of this study's data will later be determined according to Bayer's commitment to the EFPIA/PhRMA "Principles for responsible clinical trial data sharing". This pertains to scope, timepoint and process of data access. As such, Bayer commits to sharing upon request from qualified researchers patient-level clinical trial data, study-level clinical trial data, and protocols from clinical trials in patients for medicines and indications approved in the US and EU as necessary for conducting legitimate research. This applies to data on new medicines and indications that have been approved by the EU and US regulatory agencies on or after January 01, 2014. Interested researchers can use www.vivli.org to request access to anonymized patient-level data and supporting documents from clinical studies to conduct research. Information on the Bayer criteria for listing studies and other relevant information is provided in the member section of the portal.

Publications

  • Laccetti AL, Smith MR, Scher HI, Nowfar S, Einstein D, Martin B, Adorjan P, Dissanayake M, Verholen F, Gao X. ARAMON, a phase 2 open-label trial of darolutamide monotherapy in patients with biochemical recurrence or oligometastatic castration-sensitive prostate cancer after radical prostatectomy or primary radiotherapy. Eur Urol Focus. 2026 Feb 26:S2405-4569(26)00034-9. doi: 10.1016/j.euf.2026.02.005. Online ahead of print.

    PubMed 41760423

Questions about this trial

What is this clinical trial studying?

A Phase 2 study testing Darolutamide(BAY1841788, Nubeqa) and Enzalutamide in people with Biochemically Recurrent Prostate Cancer, run by Bayer at 5 sites in United States.

The full registered description is in the About this study section and the official record.

Who may be eligible to take part?

The sponsor lists 10 inclusion and 12 exclusion criteria. Eligibility is decided by the study team after screening, so read the full criteria and contact a listed site.

Is this clinical trial currently recruiting?

The record says: finished, as of the sponsor's last update on 11 Mar 2026. Status can change between updates, so confirm with the study contact before making plans.

Where is the study taking place?

The record lists 5 sites in United States. Whether a site is taking part right now should be confirmed with that site. See every site.

What are the possible benefits and risks?

They depend on the study and the treatment, and no study can promise a benefit. The study team explains the known risks during informed consent, before anyone joins; the record itself does not list them.

What does this phase mean?

Phase 2 studies give the treatment to a larger group to see whether it has the intended effect and to keep checking safety.

Not every study follows the same path, and some studies (observational studies, device studies) have no phase.

Are results available for this study?

Yes. Results are posted in the registry (first posted 15 Oct 2025). A summary is in the For doctors view, and the full results are on ClinicalTrials.gov.

How can a doctor refer a patient or contact the research team?

The record lists no contact. The official record names the sponsor, who can be asked directly. AzTrials does not enrol participants or take referrals.

What does the primary outcome measure?

Percent Change in Serum Testosterone (time frame: From baseline to week 12). It is what the study was designed to measure, not a finding.

Where can I read the original study information?

On the ClinicalTrials.gov record for NCT05526248, which also lists 1 linked publication.

Does a listing mean the treatment is approved or proven to work?

No. A listing means the study is registered. It does not show that the treatment is safe, works, or is approved by a regulator.

How often is this information updated?

AzTrials copies changed records from ClinicalTrials.gov every night and reloads the whole registry every week. The sponsor last updated this record on 11 Mar 2026.

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