Updated May 2026 · ClinicalTrials.gov

RECRUITINGPhase 1INTERVENTIONAL

A Study Evaluating the Safety, Pharmacokinetics, and Activity of RO7656594 In Participants With Advanced or Metastatic Prostate Cancer

A Phase 1, Open-Label, Multicenter, Dose-Escalation and Expansion Study Evaluating the Safety, Pharmacokinetics, and Activity of RO7656594 in Patients With Advanced or Metastatic Prostate Cancer

A Study Evaluating the Safety, Pharmacokinetics, and Activity of RO7656594 In Participants With Advanced or Metastatic Prostate Cancer (NCT05800665) is a Phase 1 interventional studying Advanced Prostate Cancer and Metastatic Prostate Cancer, sponsored by Genentech, Inc.. RECRUITING as of the most recent ClinicalTrials.gov update. Talk to your doctor before contacting the trial site.

About This Trial

What Stage of Research Is This?

Phase 1 trials test a new treatment for the first time in humans, focusing on safety, dosing, and how the body processes the drug. For Advanced Prostate Cancer, a Phase 1 study typically enrolls a small number of participants — often healthy volunteers or patients who have exhausted standard treatment options. Phase 1 results determine whether a treatment moves into larger Phase 2 efficacy studies.

This trial is currently recruiting participants. The sponsor has registered the study with ClinicalTrials.gov as actively enrolling, which means new applicants who meet the eligibility criteria can be considered for screening. Trial status can change between updates — confirm current recruiting status with the study contact before traveling for a screening visit.

Target enrollment of 210 participants puts this in the typical range for a Phase 2-style efficacy study or a moderate Phase 3 trial in a focused Advanced Prostate Cancer subpopulation. At this scale, the study has enough statistical power to detect a clear treatment effect but is not the largest cohort in the field.

Who May Be Eligible (Plain English)

Key Who May Qualify: 1. Eastern Cooperative Oncology Group (ECOG) performance status ≤1. 2. Metastatic prostate adenocarcinoma without small-cell carcinoma or neuroendocrine features. 3. Prior therapy with a second-generation androgen receptor (AR)-targeted therapy (e.g., abiraterone, enzalutamide, apalutamide, darolutamide). 4. Prior therapy with a taxane regimen or are considered ineligible for treatment with a taxane regimen or have refused treatment with a taxane regimen, unless otherwise specified. 5. For participants with a known pathogenic breast cancer gene 1 (BRCA1) or BRCA2 mutation: prior therapy with a poly (adenosine diphosphate (ADP)-ribose) polymerase (PARP) inhibitor, or are considered ineligible for treatment with a PARP inhibitor, if such therapy is approved and available. Key Who Should NOT Join This Trial: 1. Treatment with any approved systemic anti-cancer therapy within 14 days or 5 drug elimination half-lives (whichever is longer, not to exceed 28 days) prior to the first study treatment. 2. Treatment with any investigational agent within 28 days prior to the first study treatment. 3. Treatment with any previous AR protein degrader. 4. Untreated central nervous system (CNS) metastases or leptomeningeal disease. Note: Other protocol specified inclusion/exclusion criteria may apply. Always talk to your doctor about whether this trial is right for you.

These are translations of the protocol\'s inclusion and exclusion criteria, simplified for patients and caregivers. The original clinical text appears below. Eligibility is ultimately confirmed by the trial site\'s screening process — this summary is a starting point for a conversation with your doctor, not a final determination.

Original Eligibility Criteria

View original clinical language

Key Inclusion Criteria: 1. Eastern Cooperative Oncology Group (ECOG) performance status ≤1. 2. Metastatic prostate adenocarcinoma without small-cell carcinoma or neuroendocrine features. 3. Prior therapy with a second-generation androgen receptor (AR)-targeted therapy (e.g., abiraterone, enzalutamide, apalutamide, darolutamide). 4. Prior therapy with a taxane regimen or are considered ineligible for treatment with a taxane regimen or have refused treatment with a taxane regimen, unless otherwise specified. 5. For participants with a known pathogenic breast cancer gene 1 (BRCA1) or BRCA2 mutation: prior therapy with a poly (adenosine diphosphate (ADP)-ribose) polymerase (PARP) inhibitor, or are considered ineligible for treatment with a PARP inhibitor, if such therapy is approved and available. Key Exclusion Criteria: 1. Treatment with any approved systemic anti-cancer therapy within 14 days or 5 drug elimination half-lives (whichever is longer, not to exceed 28 days) prior to the first study treatment. 2. Treatment with any investigational agent within 28 days prior to the first study treatment. 3. Treatment with any previous AR protein degrader. 4. Untreated central nervous system (CNS) metastases or leptomeningeal disease. Note: Other protocol specified inclusion/exclusion criteria may apply.

Treatments Being Tested

DRUG

RO7656594

RO7656594 will be administered orally at specified dose on specified days.

Locations (20)

Trial sites listed on ClinicalTrials.gov for this study. Site activation status can vary — confirm with the specific site before traveling for a screening visit.

HonorHealth

Scottsdale, Arizona, United States

Yale Cancer Center

New Haven, Connecticut, United States

Sarah Cannon Research Institute @ Florida Cancer

Orlando, Florida, United States

University of Illinois Hospital & Health Sciences System

Chicago, Illinois, United States

SCRI Oncology Partners

Nashville, Texas, United States

St Vincent's Hospital Sydney

Darlinghurst, New South Wales, Australia

Macquarie University Hospital

New South Wales, New South Wales, Australia

Monash Health Monash Medical Centre

Clayton, Victoria, Australia

Austin Hospital

Heidelberg, Victoria, Australia

British Columbia Cancer Agency

Vancouver, British Columbia, Canada

Princess Margaret Hospital

Toronto, Ontario, Canada

Centre Léon Bérard

Lyon, France

Institut Paoli Calmettes

Marseille, France

Seoul National University Hospital

Seoul, South Korea

Severance Hospital Yonsei University Health System - PPDS

Seoul, South Korea

Asan Medical Center - PPDS

Seoul, South Korea

Samsung Medical Center - PPDS

Seoul, South Korea

Clinica Universidad de Navarra

Pamplona, Navarre, Spain

Hospital Universitario Vall d'Hebron - PPDS

Barcelona, Spain

Clinica Universidad de Navarra-Madrid

Madrid, Spain

How to Talk to Your Doctor About This Trial

Bring the printable summary of this trial — including the NCT ID (NCT05800665), the sponsor (Genentech, Inc.), and the key eligibility criteria — to your next appointment. Your doctor can review the inclusion and exclusion criteria against your medical history, lab values, and current treatments to assess whether you are likely to qualify. They can also help you weigh whether trial participation makes sense alongside your existing care plan.

Useful questions to walk through together: What does the trial protocol require beyond standard care? How long is the active treatment phase, and how long is follow-up? Are there study visits at sites I can reach? Who pays for the trial-specific procedures, and who pays for standard-of-care portions? See our 25 questions to ask about clinical trials guide for a more complete checklist.

Authoritative Sources

The official record for this trial lives on ClinicalTrials.gov — the federal registry maintained by the National Library of Medicine at NIH. For background on how this trial fits into the FDA approval pathway, see the FDA drug approval process. For oncology-specific guidance for patients considering trials, the National Cancer Institute publishes patient-oriented overviews. International trial registries are aggregated by the WHO ICTRP.

Frequently Asked Questions

What is the NCT05800665 clinical trial studying?

The purpose of this study is to evaluate the safety, tolerability, pharmacokinetics, and preliminary activity of RO7656594 in participants with advanced or metastatic prostate cancer. It will also identify recommended doses and regimens for RO7656594 for subsequent studies. The full protocol is registered on ClinicalTrials.gov and includes the primary outcome measures, eligibility criteria, and study endpoints.

Who can participate in NCT05800665?

Eligibility for this trial depends on the specific inclusion and exclusion criteria set by the sponsor. The plain-English summary above translates the most important criteria into accessible language; the official clinical text is preserved in the collapsible section underneath. Whether you fit any specific trial is a medical decision your doctor needs to confirm — bring the trial information to your treating physician for a full review against your medical history.

How do I contact the trial site for NCT05800665?

Contact information registered with ClinicalTrials.gov is shown in the sidebar of this page. Before reaching out, confirm with your treating physician that this trial is appropriate for your situation. The trial site will then walk you through the screening process to determine final eligibility.

Is participating in a clinical trial safe?

Clinical trials in the United States are regulated by the FDA and overseen by Institutional Review Boards (IRBs) that review the protocol for safety. Risk varies by trial — Phase 1 studies test new treatments in humans for the first time, while Phase 3 trials use treatments that have already passed earlier safety screening. The informed consent document for any specific trial details the known risks and what to expect. Discuss those risks with your physician before deciding whether to participate.

Where can I verify the data on this page?

Every detail on this page comes directly from the ClinicalTrials.gov API. Click "View on ClinicalTrials.gov" in the sidebar to see the official, unmodified record. The federal record is always authoritative; this page is a structured presentation with a plain-English eligibility translation. For background on how clinical trials are regulated, see the FDA drug approval process documentation.

How This Page Is Built

Every field on this page is pulled directly from the ClinicalTrials.gov API v2 — no estimates, no proxies. The plain-English eligibility translation is generated from the original protocol text and reviewed for fidelity to the underlying clinical criteria. The original clinical text remains visible in the collapsible section above so users and clinicians can verify the translation. Read the full methodology for the data pipeline and known limitations.

Source: ClinicalTrials.gov API v2 record for NCT05800665. Maintained by the National Library of Medicine at NIH. Public domain. Cite as: "TrialFinderData. NCT05800665. Data: ClinicalTrials.gov."

Medical disclaimer: This page is informational, not medical advice. Talk to your doctor about whether a clinical trial is right for you.

Last updated 2026-05-08 · Data from ClinicalTrials.gov.