⁃ Age 18 years. Ability to provide Informed Consent for participation in the study ECOG Performance Status 2 at time of enrollment. Prostate cancer, confirmed histologically or cytologically. If original documentation of histology and cytology are not available, documentation of prostate cancer satisfies these criteria. If recurrent, prior curative-intent local therapy to all sites of prostate cancer with either upfront radiotherapy or prostatectomy with or without post-operative radiotherapy.

⁃ If recurrent, PSA suspicious for biochemical recurrence after local therapy, with lab value(s) taken prior to start of SST (if current SST has already started) or within 90 days prior to enrollment if not already on SST, and meeting one of the three below categories:

⁃ PSA 0.2 ng/ml x 2 after prostatectomy +/- post-operative radiotherapy; Elevation of PSA 2 ng/ml above the nadir after definitive radiotherapy; Or Two consecutively elevated PSAs with evidence of metastasis on the imaging Studies.

• Serum testosterone obtained prior to randomization based on one of the criteria below:

⁃ For patients who have a history of a prior episode of therapy with SST agents for prostate cancer, a total testosterone 100 ng/dl after completion of the prior episode of SST and before the start of current SST or within 30 days of starting current SST if the patient has already started SST for recurrence.

⁃ For patients who have no prior history of an episode of therapy with SST agents and have already started SST for recurrence, this pre-SST testosterone is not required.

⁃ CT or MRI abdomen/pelvis performed prior to start of SST (if current SST has already started) or within 90 days prior to enrollment if not already on SST. The results from the CT component of the PET/CT can be used to fulfill this criterion. This is optional for patients who have a PSMA PET/CT. Yechnetium (Tc99m-MDP) or sodium fluoride (NaF) bone scan (sodium fluoride preferred) performed prior to start of SST (if current SST has already started), or within 90 days prior to enrollment if not already on SST. This is optional for patients who have a PSMA PET/CT. Prostate PET/CT (currently PSMA, Fluciclovine, choline) performed prior to start of SST (if current SST has already started), or within 90 days prior to enrollment if not already on SST.

⁃ 1-10 lesions suspicious for nodal recurrence or metastasis from prostate cancer as determined by the investigator based on the above imaging studies.

⁃ Has already undergone NPOP sequencing or a plan is in place for NPOP sequencing for prostate cancer.

⁃ For participants on SST at the time of enrollment only:

⁃ Has been on SST for 180 days. For participants with local recurrence after curative-intent local therapy on imaging :

⁃ Patients with local recurrence in the prostate, SV, or prostate bed are eligible as long as there is at least 1 nodal or distant metastatic recurrence. Biopsy must confirm local recurrence for patients who have had prior curative-intent radiation to the prostate, SV, or prostate bed.

⁃ Candidate for salvage local therapy (refer to Section 10.4) as determined by a urologist or radiation oncologist (depending on the respective modality to be used to treat the local recurrence).

⁃ For participants with de novo prostate cancer:

⁃ Candidate for prostate-directed radiation.