If indeed it is a recurrence your options are many (not few}.

This is from ChatGPT:
After radiation treatment for prostate cancer, recurrence can occur despite the initial treatment. Here are some options that may be considered in the event of recurrence:

Salvage Radiation Therapy: If the cancer recurs locally (in the prostate bed or nearby tissues), salvage radiation therapy may be an option. This involves delivering additional radiation to the site of recurrence.

Androgen Deprivation Therapy (ADT): Also known as hormone therapy, ADT is commonly used in cases of recurrent prostate cancer. It works by reducing the levels of male hormones (androgens) in the body, which can slow down or shrink the cancer.

Chemotherapy: In cases where the cancer has become resistant to hormone therapy, chemotherapy drugs may be used. These drugs target rapidly dividing cancer cells throughout the body.

Clinical Trials: Participation in clinical trials may offer access to new treatments and therapies that are being studied for recurrent prostate cancer.

Surgery: In some cases, surgery may be considered if the cancer recurs locally and is confined to a specific area that can be safely removed.

Active Surveillance: Depending on the characteristics of the recurrent cancer and the patient's overall health, active surveillance with close monitoring may be an option before initiating more aggressive treatments.

Cryotherapy or High-Intensity Focused Ultrasound (HIFU): These treatments may be considered for localized recurrence in the prostate, especially if the cancer is in an early stage.

The choice of treatment for recurrent prostate cancer depends on various factors including the location and extent of recurrence, the aggressiveness of the cancer, the patient's overall health, and previous treatments received. Treatment decisions are typically made in consultation with a multidisciplinary team of healthcare professionals specializing in prostate cancer management.