Clinical trial Recruiting at 6 sites Phase1; Phase2 Interventional Ages 18 and up Men only

GDC-1261 in advanced or metastatic prostate cancer

Official title: A Phase I/II Dose-escalation and Expansion Study Evaluating the Safety, Pharmacokinetics, and Preliminary Activity of GDC-1261 in Patients With Advanced or Metastatic Prostate Cancer

Run by Genentech, Inc. · NCT07567846 · Data updated 2026-11-12

This study tests GDC-1261 to see if it is safe and how it behaves in people with advanced or metastatic prostate cancer who have progressed on prior therapy.

Quick facts

PhasePhase1; Phase2
Study typeInterventional
Ages18 Years and up
SexMen only
Enrollment260 (estimated)
SponsorGenentech, Inc.
Industry-sponsored
Locations6 sites (Scottsdale, Arizona and 5 other locations)
StatusRecruiting
StartedApril 29, 2026
Main results expectedNovember 30, 2027
Study endsDecember 30, 2027
Registry record updatedNovember 5, 2026
Trial IDNCT07567846 on ClinicalTrials.gov

Is this trial a fit for you?

Likely a good fit

Ideal candidates are adults with metastatic or advanced prostate cancer, progressing after prior therapy, maintained on or having had ADT, ECOG 0-1, and adequate organ function.

Probably not a fit

Patients with rapid disease progression, poor organ function, active infections, untreated CNS metastases, or other serious medical conditions may not benefit.

A plain-English reading of the study's rules. Only the study team can confirm whether you qualify.

What this trial studies

This is a combined Phase 1/2 interventional trial evaluating GDC-1261 in men with advanced or metastatic prostate cancer. Participants will receive GDC-1261 and will be monitored for safety, how the drug is processed by the body, and any early signs of anti-tumor activity. The study aims to identify a recommended dose and regimen for future testing. Eligibility requires prior therapy with disease progression, ongoing or prior ADT, adequate organ function, and good performance status. Key exclusions include recent systemic therapy, untreated CNS metastases, uncontrolled pain, active infection, or recent cancer within the last five years.

Why it matters

Potential benefit: If successful, participants may experience disease stabilization or tumor responses and the findings could inform future dosing for GDC-1261 in prostate cancer.

How similar studies have gone: Previous early-phase studies in targeted agents for prostate cancer have shown potential signals of activity, but each agent is unique and this specific approach is investigational.

Who can join: the full rules

Show full inclusion / exclusion criteria
Inclusion Criteria:

* Eastern Cooperative Oncology Group (ECOG) Performance Status of \<=1
* Life expectancy is \>= 3 months
* Histologically or cytologically confirmed prostate adenocarcinoma
* Disease progression during or following the direct prior line of therapy
* Ongoing androgen deprivation therapy (ADT) with gonadotropin-releasing hormone (GnRH) agonist or antagonist, or have had bilateral orchiectomy
* Metastatic disease
* Adequate end organ function

Exclusion Criteria:

* Treatment with any approved systemic anti-cancer therapy within 14 days or 5 drug elimination half-lives
* Structurally unstable bone lesions suggest an impending fracture
* Untreated central nervous system (CNS) metastases or leptomeningeal disease
* Uncontrolled pain
* History of malignancy within 5 years
* Infection requiring systemic IV antibiotics within 14 days or oral antibiotics within 7 days prior to screening, or any evidence of current infection
* Any medical condition or abnormal clinical laboratory finding that, in the investigator's judgment, would preclude the individual's safe participation in and completion of the study or could affect the interpretation of the results

Where it's running

  • Honor Health Research Institute
    Scottsdale, Arizona, United States
    Recruiting
  • Yale Cancer Center
    New Haven, Connecticut, United States
    Recruiting
  • Sarah Cannon Research Institute
    Nashville, Tennessee, United States
    Recruiting
  • St Vincent's Hospital Sydney
    Darlinghurst, New South Wales, Australia
    Recruiting
  • Austin Hospital
    Heidelberg, Victoria, Australia
    Recruiting
  • The Royal Marsden in Sutton, Surrey - Downs Rd
    Sutton, Surrey, United Kingdom
    Recruiting

Study contacts

Similar studies

Other studies for the same condition or treatment. Recruiting studies are listed first.

How to take part

  1. Review the eligibility criteria above with your treating physician.
  2. Check the official listing on ClinicalTrials.gov for the latest contact details and recruitment status.
  3. Contact the study coordinator or principal investigator to ask for pre-screening. Pre-screening is free and never obligates you to enroll.
Last reviewed 2026-11-14 by the Find a Trial editorial team. Information on this page is for educational purposes and is not medical advice. Always consult qualified healthcare professionals about clinical trial participation.