NCT05919329RecruitingPhase 4
Evaluation of the Change in PSMA Expression in Prostate Cancer in Response to Hormonal Therapy
Modulation of PSMA Expression in Castration Sensitive and Castration Resistant Prostate Cancer in Response to Hormonal Therapy
Source: ClinicalTrials.gov · Last updated 20 Oct 2026
Brief summary (registry, in English)
This clinical trial investigates the change in prostate-specific membrane antigen (PSMA) expression in response to hormonal therapy in both, Castration Sensitive Prostate Cancer (CSPC) and Castration Resistant Prostate Cancer (CRPC), and whether this change in PSMA expression changes tumor staging after therapy initiation. Understanding these effects can help define the best timing to perform the PSMA positron emission tomography (PET) relative to the start of therapy.
- Status (registry)
- Recruiting
- Phase (registry)
- Phase 4
- Study type
- Interventional
- Enrollment
- 80 (estimated)
- First submitted
- 16 Jun 2023
- Start date
- 25 Jun 2024
- Primary completion date
- 1 Sept 2028
- Lead sponsor
- OHSU Knight Cancer Institute
- Diseases
- Prostate cancer
- NCT number
- NCT05919329
What you commit to
- Study type: Interventional · Phase 4
- Planned participants: 80
- From 25 Jun 2024 to the primary completion date, 1 Sept 2028
- 1 site in 1 country
- Visits and tests: ask the trial team, the registry does not list them
Built from the registry fields of ClinicalTrials.gov. It describes the study, not your situation.
Who cannot take part
Copied verbatim from ClinicalTrials.gov and grouped by topic. Only the trial team decides who can take part.
Other illness
- Uncontrolled serious infection.
- Intercurrent illness or condition that would limit compliance with study requirements.
- Participants who have undergone any cancer treatment other than the hormonal therapy (systemic or radiation therapy) or who have started any supplements or herbal medications intended to treat cancer between the baseline PSMA PET and PSMA PET at day 28.
Who the study is looking for
- Participant or legally authorized representative (LAR) must provide written informed consent before any study-specific procedures or interventions are performed.
- Participants must have confirmed prostate adenocarcinoma, histologically, or by combined imaging and biochemical markers.
- Age \>= 18 years. Given the nature of the disease in question, only men will be included. Members of all races and ethnic groups will be included.
- Participants must have sites of prostate cancer showing uptake on an initial PSMA PET scan.
- Participants are planned to receive hormonal therapy within eight weeks of the initial PSMA PET. The hormonal therapy agents include:
- For CSPC: GnRH agonists, GnRH antagonists, first-generation antiandrogen (e.g. bicalutamide), or androgen receptor (AR)-targeted agent (e.g. Abiraterone, Enzalutamide, Apalutamide, Darolutamide)
- For CRPC: this group of patients are typically on continuous ADT (GnRH agonists or antagonists), which will be continued, and the hormonal therapy they will be started on is an androgen receptor (AR)-targeted agent (e.g. Abiraterone, Enzalutamide, Apalutamide, Darolutamide)
- Life expectancy \> 3 months.
- Cohort 1: Castration resistant prostate cancer with rising PSA (confirmed by two PSA values at least 1 week apart), testosterone \< 50 ng/dL, on continuous ADT at least 4 months, no AR targeted agent in the prior 4 months.
- Cohort 2: Castration sensitive prostate cancer with no ADT or AR targeted agents use in the past 12 months, testosterone \>50 ng/dL
Age in the registry: 18 years to - · Sex: Male · Does not accept healthy volunteers
Sites (1)
Sites in registry order. Pick your city on the disease page to sort them by distance.
| Site | City | Country | Site status |
|---|---|---|---|
| OHSU Knight Cancer Institute Coordinator of this site? Confirm its status | Portland | United States | Recruiting |
This page is information, not medical advice. Discuss any trial with your doctor.