An Investigational Scan (Flotufolastat F 18 PET/CT) for Detecting Residual or Recurrent Disease in Patients Who Completed Focal Therapy for Prostate Cancer.

This phase II trial evaluates how well flotufolastat F 18 positron emission tomography (PET)/computed tomography (CT) imaging works to detect cancer that remains (residual) or that has come back (recurrent) after the completion of focal therapy for prostate cancer. Flotufolastat F 18 is a radioactive tracer that binds to prostate specific membrane antigen (PSMA), a protein over-expressed on prostate tumor cells. This allows for visualization of PSMA-expressing cells upon imaging. PET is an established imaging technique that utilizes small amounts of radioactivity attached to very minimal amounts of, in the case of this research, flotufolastat F 18. Because prostate cancer takes up flotufolastat F 18, it can be seen with PET. CT utilizes x-rays that track the body from the outside. CT images provide an exact outline of the organs and potential inflammatory tissue where it occurs in the body. The PET/CT scanner combines the PET and the CT scanners into a single device. This device combines the anatomic (body structure) information provided by the CT scan with the metabolic information obtained from the PET scan. Metabolic information means how much of the injected tracer is taken up by inflammatory tissue. Flotufolastat F 18 PET/CT imaging may be an effective and less invasive way to detect residual or recurrent disease in prostate cancer patients, compared to other methods.

PRIMARY OBJECTIVE:

1. To evaluate the accuracy of fluorine F 18 flotufolastat (flotufolastat F 18) compared with prostate biopsy to determine treatment success following focal therapy of the prostate.

SECONDARY OBJECTIVE:

1. To evaluate the standard uptake volume (SUV) threshold of flotufolastat F 18 compared to Gleason score.

EXPLORATORY OBJECTIVE:

1. To compare how flotufolastat F 18 and gallium Ga 68 gozetotide (Ga 68 PSMA 11) are distributed within the prostate in men who have previously undergone focal therapy.

OUTLINE:

Patients receive flotufolastat F-18 intravenously (IV). Then 50-100 minutes after injection, patients undergo whole-body PET/CT over 20-50 minutes. Patients then undergo PET/CT/ultrasound fusion biopsy within 3 months.

After completion of study intervention, patients are followed up at 1 month post-biopsy and then every 12 months for up to 10 years.