Understanding the Interaction Between Androgen Receptor Signaling and Prostate-Specific Membrane Antigen Expression
The goal of this research study is to determine whether hormonal therapies used early in the course of prostate cancer could increase the amount of Prostate-Specific Membrane Antigen (PSMA) as detected by PET/CT scans for participants with recurrent prostate cancer. This study will measure PSMA levels using standard PET/CT scans and participants will receive standard-of-care androgen receptor antagonist monotherapy. The names of the treatment interventions involved in this study are: * Androgen receptor antagonist monotherapy. * PSMA PET/CT scan It is expected that about 15 people will take part in this research study. Participation in this research study is expected to last about 4 weeks.
• Patients age 40 or higher with prostate cancer that has been previously treated with primary definitive local therapies (prostatectomy with or without salvage radiation, or primary prostate radiation) and subsequently experiencing rising PSA meeting criteria for biochemical failure (PSA \>0.2 ng/dL x2 following prostatectomy, or PSA \> 2 + nadir value following primary radiation).
• PSMA PET/CT (Ga68, piflutolastat F-18, or other FDA-approved tracer) during time of biochemical recurrence, and within 6 weeks of registration, showing at least one lesion suspicious for recurrent prostate cancer based on size and/or SUV.
• Testosterone \>100 ng/dL within 6 months prior to enrollment with no intervening hormonal therapies.
• Assigned by treating physician to receive standard-of-care AR antagonist monotherapy, using FDA-approved apalutamide, darolutamide, or enzalutamide.