Neoadjuvant High Dose Rate Brachytherapy Prior to Radical Prostatectomy in Patients With Prostate Cancer

Who May Qualify: 1. Subjects must have biopsy-confirmed adenocarcinoma of the prostate. 2. Subjects must have a negative bone scan and CT scan or PSMA-PET for nodal or metastatic disease. 3. Subjects must have one of the following risk factors: - PSA ≥20 and/or - Gleason score ≥8 and/or - Clinical or radiographic stage ≥T3a per AJCC (American Joint Committee on Cancer) 8th Edition Staging Manual and/or - At least two out of four of the following: PSA (Prostate Specific Antigen) 10-19.9, GS (Gleason Score) = 4+3, clinical stage = T2b/T2c, ≥50% positive biopsy cores. 4. Subjects must freely sign willing to sign a consent form to enroll in the study. 5. Subjects must be medically fit to undergo surgery and HDR-B as determined by the PI. 6. Age ≥ 40 7. ECOG Performance Status (performance status is an attempt to quantify cancer patients\' general well-being and activities of daily life, scores range from 0 to 5 where 0 represents perfect health and 5 represents death): 0-1. 8. No prior invasive malignancy in the past 3-years, except non-melanomatous skin cancer unless disease free for a minimum of 2 years. Carcinoma in-situ of the bladder or head and neck region is permissible. 9. Subjects must not have had prior androgen deprivation therapy in the past 6 months. Who Should NOT Join This Trial: 1. Metastatic disease as demonstrated by bone scan, CT scan, MRI of the pelvis, or PSMA-PET. 2. Declared high-risk for anesthesia by attending cardiologist, or other physician. 3. History of prior pelvic radiation therapy. 4. Prostate gland \>70 cc as assessed by MRI or TRUS. 5. Baseline IPSS \>15 with medical optimization. 6. History of androgen deprivation therapy within the past 6 months (except finasteride if discontinued \> 3 mo. prior to enrollment). 7. Unwilling or unable to comply with the study protocol. \- Always talk to your doctor about whether this trial is right for you.