PSMA PET Response Guided SabR in High Risk Pca

Recruiting now · Phase 1

Conditions studied: Prostate Adenocarcinoma

In brief

Sequential cohort evaluation of ideal timing of imaging and treatment spacing to discern maximal PSMA (Prostate specific membrane antigen) PET (Positron Emission Tomography) response (PSMA-11 68Ga, Illucix) for adaptation of dominant intra-prostatic lesion tumor boost dose

Key facts

Study ID

NCT06044857

Run by

University of Texas Southwestern Medical Center

People needed

20

Starts

2024-03-07

Expected to finish

2026-11-01

Last updated by the study team

2026-04-14

Who can join

Age: 18 and older, up to 99. Sex: male. Healthy volunteers: not accepted.

You may qualify if…

• Pathologically confirmed adenocarcinoma of the prostate (within 180 days of registration) of high risk by national comprehensive cancer network (NCCN) criteria as determined by >=cT3a stage (AJCC 8th edition) OR PSA>20ng/mL OR ISUP Grade Group 4-5 (Gleason Grade 8-10).
• Age ≥ 18 years.
• Planned for definitive intent stereotactic ablative radiotherapy (SabR) with integrated dose boost to intra-prostatic tumor and androgen deprivation therapy (ADT) with baseline AUA IPSS <=18 and prostate size <=100cc
• Staging 68Ga PMSA-11 PET -CT or -MRI performed within 90 days of registration and before initiation of anti-androgen or androgen deprivation therapy and demonstrating no evidence of distant metastases by (PMSA avid or non-avid nodes <=1.5cm short axis allowed). Conventional imaging (CT, bone scan, MRI) may also be used in addition to PMSA-PET, and definitive findings of distant extra-pelvic metastases on these scans are not allowed for enrollment.
• Staging 68Ga PSMA-11 PET -CT or -MRI demonstrating a PSMA-avid primary intra-prostatic target lesion amenable at investigator discretion to dose boost
• All men must agree to use adequate contraception (hormonal or barrier method of birth control; abstinence) prior to study entry, for the duration of standard of care SabR and for a period of time of 6 months thereafter as per standard guidelines. Should a man's partner become pregnant or suspect she is pregnant while participating in this study, she should inform her treating physician immediately.
• Ability to understand and the willingness to sign a written informed consent.

You may not qualify if…

• Prior curative intent local therapy (e.g. prostatectomy, radiotherapy, focal ablative therapy) for prostate cancer is not allowed, with following exceptions regarding androgen deprivation therapy (ADT)/anti-androgen therapy (AAT):
• Prior androgen deprivation therapy (ADT) allowed if <3 month total duration and stopped >=3 months prior to registration with demonstration of non-castrate testosterone recovery (>50ng/dL) and meeting all other inclusion criteria.
• Ongoing androgen deprivation therapy (ADT) is allowed if <=60 days total duration AND meeting following criteria:
• If GnRH agonist used (e.g. leuprolide), bicalutamide must have been used for at least 30 days +/-14 days from start of GnRH agonist.
• All other inclusion criteria.
• Subjects may not be receiving any other investigational agents for the treatment of the cancer under study.
• History of allergic reactions to PMSA-11 68Ga imaging agent.
• Uncontrolled intercurrent illness including, but not limited to, ongoing or active infection, symptomatic congestive heart failure, unstable angina pectoris, cardiac arrhythmia, or psychiatric illness/social situations that, in the opinion of the investigator, would limit compliance with study requirements.
• Prior pelvic radiotherapy other than cutaneous/superficial treatments.

Where it is running

• University of Texas Southwestern Medical Center — Dallas, Texas, United States (enrolling)
• UT Southwestern Medical Center — Dallas, Texas, United States

Full record on ClinicalTrials.gov

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