POst-Prostatectomy Ablative Radiation Therapy

In this observational prospective trial eligible patients are those with adverse pathological features or rising PSA after radical prostatectomy proposed for receiving 31 Gy in 5 sessions each of 6.2 Gy to the prostatic bed delivered in one week, and up to 32.5 Gy in 5 sessions each of 6.5 Gy delivered in one week, respectively, in case of clinical relapse.

Patients will be treated by means of image guided volumetric modulated radiotherapy (IGRT-VMAT). A real time non-ionizing target monitoring might be used to account for intra-fractional errors, if deemed appropriate. Whether the dose constraints to the normal tissues are at risk, these will be prioritised over the prescription dose to the target. The primary endpoint of the trial is to assess the treatment related toxicity measured by the CTCAE v5.0. Secondary endpoints are quality of life in different domains (sexual, rectal , urinary) and biochemical outcome.

Patients will be followed at approximately one month, then every 3 months for the first 12 months and every 6 months thereafter. Quality of Life will be prospectively evaluated through validated tools (ECOG, EPIC, IIEF-5, ICIQ-SF) at various timepoints. Percentage or total mean score will be reported according to the questionnaires, whether they grade values in a scale or use descriptive statistics. Kaplan-Meier curve analysis of biochemical relapse free survival (b-RFS) at 2 and 5-year bRFS for all patients will be estimated.

Inclusion criteria

• Adenocarcinoma of the prostate treated with radical prostatectomy (any type of radical prostatectomy is permitted including retropubic, perineal, laparoscopic or robotically assisted; there is no time limit for the date of radical prostatectomy).
• Pathologic T3N0/Nx disease or pathologic T2N0/Nx disease, with or without a positive prostatectomy surgical margin
• Post-radical prostatectomy PSA of ≥ 0.1 - < 2.0 ng/mL.
• Clinical local relapse assessed by Magnetic Resonance Imaging (MRI) of the pelvis
• ECOG performance status of 0-1
• No distant metastases at restaging (in case of biochemical failure), within 60 days prior to registration
• Patients can be on androgen deprivation therapy
• Ability to understand and willingness to sign a study-specific informed consent prior to study entry

Exclusion criteria

• N1 and or M1 patients
• Prior radiation of any kind to the prostate gland or pelvis
• Prior brachytherapy is not allowed
• History of inflammatory colitis or other active severe comorbidities
• Patients who are on immunosuppressant medication