68Ga-PSMA PET/CT for Ra223 Assessment

August 24, 2025 updated by: Jing-Ren Tseng, Chang Gung Memorial Hospital

Using 68Ga-PSMA PET/CT for the Assessment of Osseous Tumor Burden in mCRPC Patients Undergoing 223Ra-dichloride Injections

Primary objective:

i.The primary objective is to compare the diagnostic positivity in progression of 68Ga-PSMA PET and Bone scan.

Secondary objectives:

i.The correlation between PET osseous tumor burden index and Alk-P level ii.The correlation between PET osseous tumor burden index and PSA level

Study Overview

Status

Status

Indicates the current recruitment status or the expanded access status.
Recruiting

Conditions

Conditions

The disease, disorder, syndrome, illness, or injury that is being studied. On ClinicalTrials.gov, conditions may also include other health-related issues, such as lifespan, quality of life, and health risks.

Intervention / Treatment

Intervention / Treatment

A process or action that is the focus of a clinical study. Interventions include drugs, medical devices, procedures, vaccines, and other products that are either investigational or already available. Interventions can also include noninvasive approaches, such as education or modifying diet and exercise.

Detailed Description

It is a open-label single-arm clinical trial. Outcome measurement is the positivity rate of Ga68-PSMA-11 PET-defined progression and Bone Scan-defined progression. The primary objective is to compare the diagnostic positivity in progression of PSMA PET and BS. The 2×2 contingency table with four diagnostic outcomes (both positive, PET positive/BS negative, PET negative/BS positive, and both negative) will be conducted based on the enrolled subjects. Both diagnostic tools (Ga68-PSMA-11 PET and BS) are applied to a given set of individuals. Since both diagnostic tools will performed on each subject, then paired data result and methods that account for the correlated binary outcomes are necessary. McNemar's test will be used to compare the positivity of the two tools. Assuming that Ga68-PSMA-11 PET in patients detect more metastatic lesions/progression by 26.5% (i.e. p10-p01=0.265) and the discordant percentage is 38.5 % (i.e. p10+p01=0.385). Under the hypothesis H0: p10=p01, achieving an 80% power at the 5% of significance level, the sample size is 44. Based on expecting 15% of missing rate, the adjusted sample size will be 52. This calculation was done by PASS software (Power Analysis and Sample Size version 11.0.8, NCSS, Kaysville, Utah, USA).

For PET/CT PSMA scan, the subject will have catheter(s) placed for intravenous administration of [68Ga]PSMA-11. Subjects will receive a single intravenous bolus of 2-5 mCi [68Ga]PSMA-11 and received PET/CT scan 60 minutes later. PSMA PET-CT scan was performed on a GE Discovery MI PET/CT system. The CT scan parameters were 120 kVp, 30 mA to 300 mA acquired with auto mA , 40× 0.625 collimator configuration, and pitch of 0.984 : 1. All images were reconstructed with a 500 mm field of view and a slice thickness of 5 mm. The PET acquisition time was 3 mins per bed position with maximum overlap (35 slices). Images were reconstructed using Q clear with beta value of 550, PSF correction, and non-TOF (QCHD-S). The matrix is 256 × 256. After image acquisition, the subject will be observed for half an hour, and will be discharged if no adverse event happens. EKG, blood and biochemistry test will be performed before and after first PET scan no more than two weeks. Except baseline Ga68-PSMA-11 PET/CT scan, patients will receive serial PET scans after 3rd injection of Ra-233 and 6th injection of Ra-223. All of the images were interpreted by an experienced nuclear medicine physicians.

Study Type

Study Type

Describes the nature of a clinical study. Study types include interventional studies (also called clinical trials), observational studies (including patient registries), and expanded access.
Interventional

Enrollment (Estimated)

Enrollment

The number of participants in a clinical study. The "anticipated" enrollment is the target number of participants that the researchers need for the study.
52

Phase

Phase

The stage of a clinical trial studying a drug or biological product, based on definitions developed by the U.S. Food and Drug Administration (FDA). The phase is based on the study's objective, the number of participants, and other characteristics. There are five phases: Early Phase 1 (formerly listed as Phase 0), Phase 1, Phase 2, Phase 3, and Phase 4. Not Applicable is used to describe trials without FDA-defined phases, including trials of devices or behavioral interventions.
  • Not Applicable

Contacts and Locations

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

Study Contact

Study Contact

The name and contact information for the person who can answer enrollment questions for a clinical study. Each location where the study is being conducted may also have a specific contact, who may be better able to answer those questions.

Study Locations

  • Taiwan
      • Taoyuan, Taiwan, 333
        • Recruiting
        • Chang Gung Memorial Hospital ,Linkou
        • Contact:

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

Eligibility Criteria

The key requirements that people who want to participate in a clinical study must meet or the characteristics they must have. Eligibility criteria consist of both inclusion criteria (which are required for a person to participate in the study) and exclusion criteria (which prevent a person from participating). Types of eligibility criteria include whether a study accepts healthy volunteers, has age or age group requirements, or is limited by sex.

Ages Eligible for Study

40 years to 85 years (Adult, Older Adult)

Accepts Healthy Volunteers

No

Description

Inclusion Criteria:

  1. Males with 40-85 years of age and life expectancy more than 3 months
  2. Patient was diagnosed as mCRPC, and meet the standard criteria of using 223Ra-dichloride (symptomatic bone metastasis, at least two bone metastasis sites, no visceral organ metastasis)
  3. Willing to sign the informed consent
  4. ECOG performance status Grade 0-2

Exclusion Criteria:

  1. Unable to tolerate the PET/CT scan, such as those with claustrophobia, unable to lie still, consciousness unclear, vital sign unstable.
  2. With renal impairment (glomerular filtration rate lower than 30 ml/min/1.73 m2), and allergy to medium contrast.
  3. Significant abnormal lab data (AST or ALT more than three times of normal value), and high risk to conduct examination after evaluations of PI.
  4. Patient had previous other malignancy history
  5. Patient experiences grade 3-4 neutropenia (neutrophil counts less than 1000/uL) or thrombocytopenia (platelet counts less than 50x103/uL) lasting > 14 days

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: N/A
  • Interventional Model: Single Group Assignment
  • Masking: None (Open Label)

Arms and Interventions

Participant Group / Arm

Participant Group / Arm

A group or subgroup of participants in a clinical trial that receives a specific intervention/treatment, or no intervention, according to the trial's protocol.
Intervention / Treatment

Intervention / Treatment

A process or action that is the focus of a clinical study. Interventions include drugs, medical devices, procedures, vaccines, and other products that are either investigational or already available. Interventions can also include noninvasive approaches, such as education or modifying diet and exercise.
Experimental: Ga68-PSMA ligand
Glass vial with 5~20 mCi(185-740 MBq) of 68Ga-PSMA ligand in ≤10% EtOH with aqueous sterile water for injection solution (approximately 15.5 mL), ≧ 0.33 mCi/mL @ EOS。
Drug: Ga-68 PSMA ligand
For PET/CT PSMA scan, the subject will have catheter(s) placed for intravenous administration of [68Ga]PSMA-11. Subjects will receive a single intravenous bolus of 2-5 mCi [68Ga]PSMA-11 and received PET/CT scan 60 minutes later.PSMA PET-CT scan was performed on a GE Discovery MI PET/CT system.
Other Names:
  • Ga68-PSMA-11 (Gallium-68 labeled HBED-CC PSMA)

What is the study measuring?

Primary Outcome Measures

Primary Outcome Measures

In a clinical study's protocol, the planned outcome measure that is the most important for evaluating the effect of an intervention/treatment. Most clinical studies have one primary outcome measure, but some have more than one.
Outcome Measure
Measure Description
Time Frame
Change of lesion detection number by PET imaging
Time Frame: 9-11 weeks or 21-23 weeks
Lesion detection number before and under Ra223 therapy on the PSMA PET imaging with a time interval 9-11 weeks and/or 21-23 weeks
9-11 weeks or 21-23 weeks

Collaborators and Investigators

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

Sponsor

Sponsor

The organization or person who initiates the study and who has authority and control over the study.
Chang Gung Memorial Hospital

Investigators

Investigators

A researcher involved in a clinical study. Related terms include site principal investigator, site sub-investigator, study chair, study director, and study principal investigator.
  • Principal Investigator: Jing-Ren Tseng, MD, Chang Gung Memorial Hospital

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)

Study Start

The actual date on which the first participant was enrolled in a clinical study. The "anticipated" study start date is the date that the researchers think will be the study start date.
March 2, 2022

Primary Completion (Estimated)

Primary Completion

The date on which the last participant in a clinical study was examined or received an intervention to collect final data for the primary outcome measure. Whether the clinical study ended according to the protocol or was terminated does not affect this date. For clinical studies with more than one primary outcome measure with different completion dates, this term refers to the date on which data collection is completed for all the primary outcome measures. The "anticipated" primary completion date is the date that the researchers think will be the primary completion date for the study.
August 31, 2025

Study Completion (Estimated)

Study Completion

The date on which the last participant in a clinical study was examined or received an intervention/treatment to collect final data for the primary outcome measures, secondary outcome measures, and adverse events (that is, the last participant's last visit). The "anticipated" study completion date is the date that the researchers think will be the study completion date.
August 31, 2025

Study Registration Dates

First Submitted

First Submitted

The date on which the study sponsor or investigator first submitted a study record to ClinicalTrials.gov. There is typically a delay of a few days between the first submitted date and the record's availability on ClinicalTrials.gov (the first posted date).
June 30, 2021

First Submitted That Met QC Criteria

First Submitted That Met QC Criteria

The date on which the study sponsor or investigator first submits a study record that is consistent with National Library of Medicine (NLM) quality control (QC) review criteria. The sponsor or investigator may need to revise and submit a study record one or more times before NLM's QC review criteria are met. It is the responsibility of the sponsor or investigator to ensure that the study record is consistent with the NLM QC review criteria.
June 30, 2021

First Posted (Actual)

First Posted

The date on which the study record was first available on ClinicalTrials.gov after National Library of Medicine (NLM) quality control (QC) review has concluded. There is typically a delay of a few days between the date the study sponsor or investigator submitted the study record and the first posted date.
July 7, 2021

Study Record Updates

Last Update Posted (Estimated)

Last Update Posted

The most recent date on which changes to a study record were made available on ClinicalTrials.gov. There may be a delay between when the changes were submitted to ClinicalTrials.gov by the study's sponsor or investigator (the last update submitted date) and the last update posted date.
August 29, 2025

Last Update Submitted That Met QC Criteria

Last Update Submitted That Met QC Criteria

The most recent date on which the study sponsor or investigator submitted changes to a study record that are consistent with National Library of Medicine (NLM) quality control (QC) review criteria. It is the responsibility of the sponsor or investigator to ensure that the study record is consistent with the NLM QC review criteria.
August 24, 2025

Last Verified

Last Verified

The most recent date on which the study sponsor or investigator confirmed the information about a clinical study on ClinicalTrials.gov as accurate and current. If a study with a recruitment status of recruiting; not yet recruiting; or active, not recruiting has not been confirmed within the past 2 years, the study's recruitment status is shown as unknown.
August 1, 2024

More Information

Terms related to this study

Keywords

Additional Relevant MeSH Terms

Other Study ID Numbers

Other Study ID Numbers

Identifiers or ID numbers other than the NCT number that are assigned to a clinical study by the study's sponsor, funders, or others. These numbers may include unique identifiers from other trial registries and National Institutes of Health grant numbers.
  • 202002133A0

Plan for Individual participant data (IPD)

Plan to Share Individual Participant Data (IPD)?

NO

Drug and device information, study documents

Studies a U.S. FDA-regulated drug product

No

Studies a U.S. FDA-regulated device product

No

product manufactured in and exported from the U.S.

No

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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