High Intensity Focused Ultrasound in Prostate Cancer

Inclusion Criteria:

Males who are ≥ 18 years of age
Eastern Cooperative Oncology Group Performance Status of 0-3
A history of prostate cancer treated with radiation therapy or proton beam therapy +/- hormone therapy
MRI or prostate-specific membrane antigen (PSMA) PET region of interest (ROI)
Biopsy proven clinically significant prostate cancer (GG2 or above) recurrence within or ipsilateral to the ROI lesion (within 6 months of the MRI/PET).
Contralateral grade group 1 (GG1) prostate cancer disease to the ROI
PSMA PET negative for metastatic disease (within 3 months of the biopsy)
Subjects must not have more than one active malignancy at the time of enrollment (Subjects with a prior or concurrent malignancy whose natural history or treatment does not have the potential to interfere with the safety or efficacy assessment of the investigational regimen [as determined by the treating physician and approved by the PI] may be included).
Written informed consent obtained from the subject and the subject agrees to comply with all the study-related procedures.

Exclusion Criteria:

Contraindication to high intensity focused ultrasound (latex allergy, absent rectum, prior rectal fistula or significant rectal surgery making insertion of transrectal probe non-feasible or dangerous.)
Hormone therapy within 6 months of the screening period (Hormone therapy includes oral (relugolix, abiraterone, enzalutamide, apalutamide, darolutamide, casodex) injections (firmagon, Lupron))
History of Inflammatory Bowel Disease actively treated in last 3 years
Evidence of ≥ cT3 recurrent disease on imaging
Bilateral clinically significant prostate cancer (≥GG2 bilaterally)
GG1 prostate cancer at relapse biopsy (this will not be considered clinically significant prostate cancer)
History of brachytherapy seeds still implanted or other fiduciary marker which is near (same quadrant) as a planned treatment zone
Large Calcification on CT or transrectal ultrasound which, as per the review of the surgeon, limits or hinders a quality high intensity focused ultrasound to the region of interest
History of Urethral strictures
No prior radiation therapy for prostate cancer
Subjects without a ROI on MRI or PET
Metastatic disease or locally advanced disease (defined by pelvic lymph node involvement or T4 disease) on PSMA PET
History of any other disease, metabolic dysfunction, clinical examination finding, or clinical laboratory finding giving reasonable suspicion of a disease or condition that contraindicates the use of protocol therapy or that might affect the interpretation of the results of the study or that puts the subject at high risk for treatment complications, in the opinion of the treating physician.
Prisoners or subjects who are involuntarily incarcerated, or subjects who are compulsorily detained for treatment of either a psychiatric or physical illness.