Shorter hormone therapy meets precision radiation in High-Risk prostate cancer

Copied word for word from the study's registry entry, so the wording is the study team's rather than ours.

Inclusion Criteria: 1. Histologically confirmed adenocarcinoma of the prostate (histological confirmation can be based on tissue taken at any time, but a re-biopsy should be considered if the biopsy is more than 12 months old) 2. Primary PCa (in PSMA-PET imaging and multiparametric magnetic resonance imaging (mpMRI) 3. High-risk according to NCCNv4.2023 criteria (cT3a or Grade group 4-5 or PSA \> 20 ng/ml) 4. Signed written informed consent for this study 5. Age \>18 years 6. Previously conducted PSMA-PET/CT, mpMRI or PSMA-PET/MR 7. MMAI low-/intermediate-risk 8. ECOG Performance score 0 or 1 9. IPSS Score ≤15 10. Prostate biopsy core with the highest ISUP grade available Exclusion Criteria: 1. Prior radiotherapy to the prostate or pelvis 2. Prior radical prostatectomy 3. Prior focal therapy approaches to the prostate 4. Evidence of pelvic nodal disease (cN+) in mpMRI and/or PSMA-PET/CT 5. Evidence of distant metastatic disease (cM+) in mpMRI and/or PSMA-PET/CT 6. Time gap between the beginning of any systemic therapy, ADT and conduction of PSMA-PET scans is \>2 months 7. Evidence of cT4 disease in mpMRI and/or PSMA-PET/CT 8. PSA \>50 ng/ml prior to starting of systemic therapy 9. Expected patient survival \<5 years 10. Bilateral hip prostheses or any other implants/hardware that would introduce substantial CT artifacts 11. Contraindication to undergo a MRI scan 12. Contraindication to undergo HDR brachytherapy (brachytherapy not feasible due to large prostate volume, prostate anatomy, tumor in distant seminal vesicles and/or unfit for anaesthesia) 13. Contraindication to Goserelin 14. Prostate surgery (TURP or HOLEP) with a significant tissue cavity or prostate surgery (TURP or HOLEP) within the last 6 months prior to randomization 15. Medical conditions likely to make radiotherapy inadvisable e.g. acute inflammatory bowel disease, hemiplegia or paraplegia 16. Previous malignancy within the last 2 years (except basal cell carcinoma or squamous cell carcinoma of the skin), or if previous malignancy is expected to significantly compromise 5 year survival 17. Any other contraindication to external beam radiotherapy (EBRT) to the pelvis 18. Participation in any other interventional clinical trial within the last 30 days before the start of this trial 19. Simultaneous participation in other interventional trials which could interfere with this trial; simultaneous participation in registry and diagnostic trials is allowed 20. Patient without legal capacity who is unable to understand the nature, significance and consequences of the trial; 21. Known or persistent abuse of medication, drugs or alcohol 22. Patients expected to have severe set up problems (e.g. mental condition)