Multicenter Randomized Trial of 68Ga-PSMA-11 PET/CT Based SRT After Radical Prostatectomy (PSMA SRT)

May 21, 2026 updated by: Jonsson Comprehensive Cancer Center

Phase III Randomized Multicenter Trial of 68Ga-PSMA-11 PET/CT Molecular Imaging for Prostate Cancer Salvage Radiotherapy Planning [PSMA-SRT]

This phase III trial studies how well Gallium Ga 68-labeled PSMA-11 (68Ga-PSMA-11) positron emission tomography (PET)/computed tomography (CT) works in diagnosing participants with prostate cancer that has come back after surgery. 68Ga-PSMA-11 are taken up by cancer cells. Diagnostic procedures, such as PET/CT scans, may help find and diagnose prostate cancer and find out how far the disease has spread. Giving 68Ga-PSMA-11 with PET/CT may help doctors plan better for salvage radiation therapy in participants with recurrent prostate cancer.

Study Overview

Status

Active, not recruiting

Conditions

Intervention / Treatment

Detailed Description

PRIMARY OBJECTIVE:

I. Success rate of salvage radiation therapy (SRT) measured as biochemical progression-free survival after initiation of SRT.

SECONDARY OBJECTIVES:

I. Sub-group analysis of the primary endpoint (success rate of SRT) within the subgroup with baseline PSA ≥ 0.5 ng/ml II. 5-year biochemical progression-free survival rate (from date of randomization).

III. Metastasis free survival. IV. Initiation of additional salvage therapy after completion of SRT. V. Change in initial treatment intent.

OUTLINE: Participants are randomized to 1 of 2 arms.

ARM I: Participants receive standard of care SRT.

ARM II: Participants receive 68Ga-PSMA-11 intravenously (IV) and 50-100 minutes later undergo whole-body (skull base to mid-thighs) PET/CT. Participants then undergo SRT per the discretion of the treating radiation oncologist.

After conclusion of PET/CT, participants are followed up periodically for up to 5 years.

Study Type

Interventional

Enrollment (Estimated)

193

Phase

  • Phase 3

Contacts and Locations

This section provides the contact details for those conducting the study, and information on where this study is being conducted.

Study Locations

  • United States
    • California
      • Los Angeles, California, United States, 90095
        • UCLA / Jonsson Comprehensive Cancer Center
      • San Francisco, California, United States, 94115
        • UCSF Medical Center-Mount Zion

Participation Criteria

Researchers look for people who fit a certain description, called eligibility criteria. Some examples of these criteria are a person's general health condition or prior treatments.

Eligibility Criteria

Ages Eligible for Study

  • Child
  • Adult
  • Older Adult

Accepts Healthy Volunteers

No

Description

Inclusion Criteria:

  • Histopathology proven prostate cancer.
  • Planned SRT for recurrence after primary prostatectomy.
  • Prostate-specific antigen (PSA) >= 0.1 ng/ml at time of enrollment.
  • Willingness to undergo radiotherapy.
  • Treating radiation oncologist intends to incorporate 68Ga-PSMA-11 PET/CT findings into the radiotherapy plan if patient undergoes 68Ga-PSMA-11 PET/CT.

Exclusion Criteria:

  • Extra-pelvic metastasis on any imaging or biopsy.
  • Androgen deprivation therapy (ADT) within 3 months before 68Ga-PSMA-11 PET/CT.
  • Contraindications to radiotherapy (including active inflammatory bowel disease).
  • Concurrent systemic therapy for prostate cancer with investigational agents.

Study Plan

This section provides details of the study plan, including how the study is designed and what the study is measuring.

How is the study designed?

Design Details

  • Primary Purpose: Diagnostic
  • Allocation: Randomized
  • Interventional Model: Parallel Assignment
  • Masking: None (Open Label)

Arms and Interventions

Participant Group / Arm
Intervention / Treatment
Active Comparator: Arm I (standard of care)
Participants receive standard of care SRT.
Other: Best Practice
Undergo standard of care
Other Names:
  • standard of care
  • standard therapy
Experimental: Arm II (68Ga-PSMA-11 PET/CT)
Participants receive 68Ga-PSMA-11 IV and 50-100 minutes later undergo whole-body (skull base to mid-thighs) PET/CT. Participants then undergo SRT per the discretion of the treating radiation oncologist.
Procedure: Computed Tomography
Undergo PET/CT
Other Names:
  • CT
  • CAT
  • CAT Scan
  • Computerized Axial Tomography
  • Computerized Tomography
  • CT Scan
  • tomography
Procedure: Positron Emission Tomography
Undergo PET/CT
Other Names:
  • Medical Imaging, Positron Emission Tomography
  • PET
  • PET Scan
  • Positron Emission Tomography Scan
  • Positron-Emission Tomography
  • proton magnetic resonance spectroscopic imaging
Radiation: Gallium Ga 68-labeled PSMA-11
Given IV
Other Names:
  • (68)Ga labeled Glu-NH-CO-NH-Lys(Ahx)-HBED-CC
  • (68)Ga-labeled Glu-urea-Lys(Ahx)-HBED-CC
  • (68)Ga-PSMA Ligand Glu-urea-Lys(Ahx)-HBED-CC
  • (68)Gallium-PSMA Ligand Glu-urea-Lys(Ahx)-HBED-CC
  • (68Ga)Glu-urea-Lys(Ahx)-HBED-CC
  • 68Ga-DKFZ-PSMA-11
  • 68Ga-HBED-CC-PSMA
  • 68Ga-labeled Glu-NH-CO-NH-Lys(Ahx)-HBED-CC
  • 68Ga-PSMA
  • 68Ga-PSMA-11
  • 68Ga-PSMA-HBED-CC
  • [68Ga] Prostate-specific Membrane Antigen 11
  • [68Ga]GaPSMA-11
  • Ga PSMA
  • Ga-68 labeled DKFZ-PSMA-11
  • Ga-68 labeled PSMA-11
  • Gallium Ga 68 PSMA-11
  • Gallium-68 PSMA
  • Gallium-68 PSMA Ligand Glu-urea-Lys(Ahx)-HBED-CC
  • GaPSMA
  • PSMA-HBED-CC GA-68

What is the study measuring?

Primary Outcome Measures

Outcome Measure
Measure Description
Time Frame
Success rate of salvage radiation therapy (SRT)
Time Frame: From date of initiation of SRT assessed up to 5 years
Will be measured as biochemical progression-free survival after initiation of SRT. Will use a log rank test to compare progression free survival time between the two randomized treatment arms.
From date of initiation of SRT assessed up to 5 years

Secondary Outcome Measures

Outcome Measure
Measure Description
Time Frame
Biochemical progression-free survival rate
Time Frame: From date of randomization assessed up to 5 years
Will utilize Cox-proportional hazards regression models. These models will include terms for treatment as well as appropriate clinical/demographic covariates (e.g., androgen deprivation therapy [ADT], pelvic lymph node radiation therapy [LN RT], prostate specific antigen [PSA] doubling time, Gleason grade, T stage, age, etc). Residual analyses will be performed to evaluate the proportional hazards assumptions of the Cox model. As a sensitivity analysis, we will also consider survival models that can account for competing risks (ex. death from other causes).
From date of randomization assessed up to 5 years
Metastasis free survival
Time Frame: Up to 5 years
Will utilize Cox-proportional hazards regression models. These models will include terms for treatment as well as appropriate clinical/demographic covariates (e.g., ADT, pelvic LN RT, PSA doubling time, Gleason grade, T stage, age, etc). Residual analyses will be performed to evaluate the proportional hazards assumptions of the Cox model. As a sensitivity analysis, we will also consider survival models that can account for competing risks (ex. death from other causes).
Up to 5 years
Initiation of additional salvage therapy after completion of SRT
Time Frame: Up to 5 years
Will utilize Cox-proportional hazards regression models. These models will include terms for treatment as well as appropriate clinical/demographic covariates (e.g., ADT, pelvic LN RT, PSA doubling time, Gleason grade, T stage, age, etc). Residual analyses will be performed to evaluate the proportional hazards assumptions of the Cox model. As a sensitivity analysis, we will also consider survival models that can account for competing risks (ex. death from other causes).
Up to 5 years
Change in initial treatment intent
Time Frame: Up to 5 years
Will utilize Cox-proportional hazards regression models. These models will include terms for treatment as well as appropriate clinical/demographic covariates (e.g., ADT, pelvic LN RT, PSA doubling time, Gleason grade, T stage, age, etc). Residual analyses will be performed to evaluate the proportional hazards assumptions of the Cox model. As a sensitivity analysis, we will also consider survival models that can account for competing risks (ex. death from other causes).
Up to 5 years

Collaborators and Investigators

This is where you will find people and organizations involved with this study.

Sponsor

Jonsson Comprehensive Cancer Center

Collaborators

National Cancer Institute (NCI)

Investigators

  • Principal Investigator: Jeremie Calais, UCLA / Jonsson Comprehensive Cancer Center

Publications and helpful links

The person responsible for entering information about the study voluntarily provides these publications. These may be about anything related to the study.

General Publications

Study record dates

These dates track the progress of study record and summary results submissions to ClinicalTrials.gov. Study records and reported results are reviewed by the National Library of Medicine (NLM) to make sure they meet specific quality control standards before being posted on the public website.

Study Major Dates

Study Start (Actual)

July 12, 2018

Primary Completion (Estimated)

July 12, 2027

Study Completion (Estimated)

July 12, 2028

Study Registration Dates

First Submitted

June 19, 2018

First Submitted That Met QC Criteria

June 27, 2018

First Posted (Actual)

July 11, 2018

Study Record Updates

Last Update Posted (Actual)

May 26, 2026

Last Update Submitted That Met QC Criteria

May 21, 2026

Last Verified

May 1, 2026

More Information

Terms related to this study

Keywords

Additional Relevant MeSH Terms

Other Study ID Numbers

  • 18-000484 (UCLA / Jonsson Comprehensive Cancer Center)
  • NCI-2018-01518 (Registry Identifier: CTRP (Clinical Trial Reporting Program))
  • NUC MED 18-000484

Drug and device information, study documents

Studies a U.S. FDA-regulated drug product

No

Studies a U.S. FDA-regulated device product

Yes

product manufactured in and exported from the U.S.

Yes

This information was retrieved directly from the website clinicaltrials.gov without any changes. If you have any requests to change, remove or update your study details, please contact register@clinicaltrials.gov. As soon as a change is implemented on clinicaltrials.gov, this will be updated automatically on our website as well.

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