A Trial of 5 Fraction Prostate SBRT Versus 5 Fraction Prostate and Pelvic Nodal SBRT

Phase 3

Recruiting

• Conditions: Prostate Cancer

• Registration Number: NCT05613023
• Lead Sponsor: Institute of Cancer Research, United Kingdom

Brief Summary

This study will compare the safety and efficacy of curative radiotherapy to the prostate and lymph glands given in 5 visits to that of prostate alone radiotherapy given in 5 visits, in men with high risk localised prostate cancer.

Detailed Description

This study will look at the safety of curative radiotherapy to the prostate and lymph glands given in 5 visits, in men with high risk localised prostate cancer.

The purpose of the research is to test an advanced type of external beam radiotherapy called stereotactic body radiotherapy (also known as SBRT) in 536 participants with high risk localised prostate cancer (that is, prostate cancer that has not spread beyond the prostate gland but is at high risk of growing quickly or spreading). Importantly, this treatment delivers a potentially curative dose of radiotherapy in only 5 treatments over two weeks. Half the participants in the trial will receive radiotherapy to the prostate, the other half will have radiotherapy to the prostate as well as the surrounding lymph nodes. The investigators will follow patients in the trial for at least three and half years to see which treatment is best. The investigators will be looking at whether it is safe to give this treatment by reviewing any side-effects that occur and also assessing whether giving SBRT to the lymph nodes as well as the prostate reduces the chance of prostate cancer returning.

The treatment will take place at NHS radiotherapy centres that are experienced in giving SBRT and radiotherapy to the pelvic nodes, and have been quality assured to deliver these treatments

Study Timeline

• Study First Submitted: 2022-03-07
• Study Start: 2022-09-09
• Status Verified: 2022-11
• Study First Submitted QC: 2022-11-10
• Last Update Submitted: 2022-11-10
• Study First Posted: 2022-11-14
• Last Update Posted: 2022-11-14
• Primary Completion: 2028-06
• Study Completion: 2030-06

Recruitment & Eligibility

• Status: RECRUITING
• Sex: Male
• Target Recruitment: 536

Inclusion Criteria

1. Aged ≥ 18 years at randomisation

2. Histopathological confirmation of prostate adenocarcinoma with Gleason/ISUP grade group scoring within twelve months of randomisation (unless otherwise discussed with the CI or co-Clinical Leads)

3. Patients planned for 12-36 months androgen deprivation therapy

4. High risk localised prostate cancer as defined by

   • Gleason 8-10 (grade groups 4 and 5) and/or
   • Stage T3a/b or T4 and/or
   • PSA > 20ng/ml (or >10 ng/ml for patients on 5-alpha reductase inhibitors)

5. Multi-parametric MRI of the pelvis- to include at least one functional MRI sequence in addition to T2W imaging within twelve months of randomisation

6. Radiological staging to exclude metastatic disease, prior to starting ADT, with one of the following: PSMA PET-CT, fluciclovine/choline PET-CT, whole-body MRI, bone scan, CT of chest, abdomen and pelvis (imaging method as per local practice/standard of care).

7. WHO performance status 0-2

8. Ability of research subject to give written informed consent

Exclusion Criteria

1. N1 or M1 disease
2. PSA >50ng/ml (or >25ng/ml for patients on 5-alpha reductase inhibitors), unless PET-CT imaging has been performed to confirm N0M0 disease
3. Previous active treatment for prostate cancer
4. Patients where SBRT is contraindicated: prior pelvic radiotherapy, inflammatory bowel disease, significant lower urinary tract symptoms N.B. where patient has repeated imaging showing bowel in close apposition to target volumes that would make pelvic radiotherapy highly unlikely to be deliverable should be excluded.
5. Contraindications to fiducial marker insertion, where used- including clotting disorders, or patients at high risk when stopping anticoagulation or antiplatelet medications
6. Bilateral hip prostheses or any other implants/hardware that would introduce substantial CT artefacts and would make pelvic node planning more difficult.
7. Patients who have had chemotherapy within 6 weeks of the start of radiotherapy.
8. Life expectancy < 5 years

Study & Design

• Study Type: INTERVENTIONAL
• Study Design: PARALLEL

Primary Outcome Measures

Name	Time	Method
Time to biochemical or clinical failure	minimum of 3.5 years follow up post-randomisation	Time to biochemical or clinical failure as defined by time from randomisation to the first progression event (either biochemical failure, local recurrence, lymph node/pelvic recurrence, distant metastases, recommencement of androgen deprivation therapy or death due to prostate cancer).

Secondary Outcome Measures

Name	Time	Method
Adherence to radiotherapy protocol	after completion of treatment	Qualitative analysis of adherence to pre-specified radiotherapy dose constraints with radiotherapy quality assurance to demonstrate feasibility in a muliticentre setting.
Metastatic relapse-free survival	up to 5 years post-randomisation	Time from randomisation to distant metastases or death from prostate cancer
Clinical reported acute toxicity	12 weeks post-randomisation	Clinical reported acute and late toxicity using CTCAE version 5.0 and RTOG criteria. Focus will be given to GU and GI Grade 2 or higher (G2+) toxicities
Overall survival	up to 5 years post-randomisation	Time from randomisation to death from any cause
Prostate cancer-specific survival	up to 5 years post-randomisation	Time from randomisation to death due to prostate cancer
Clinical reported late toxicity	up to 5 years post-randomisation	Clinical reported acute and late toxicity using CTCAE version 5.0 and RTOG criteria. Focus will be given to GU and GI Grade 2 or higher (G2+) toxicities
Patient Reported Outcome Measures	up to 5 years post-randomisation	Quality of life will be evaluated using combined data from the following questionnaires. IPSS questionnaire: a validated diagnostic tool used to assess urinary \& bowel incontinence.; IIEF-5: validated diagnostic tool for erectile dysfunction. EPIC questionnaire: to assess typical symptoms after radiotherapy in prostate cancer patients. EQ-5D: a commonly used generic questionnaire to measure health-related QoL used to asess mobility, self-care, usual activities, pain/discomfort, anxiety/depression \& the subject's perceptions of their own current overall health. A QoL analysis plan will be developed in consultation with the TMG with key endpoints for each questionnaire. Standard algorithms will be used to derive scores and handle missing data. Changes from baseline at each time point will be compared within groups as well as between treatment groups (by means of ordinal logistic regressions or ANCOVA models). Analyses to account for the longitudinal nature of the data may be used.

Trial Locations

Locations (42)

Bon Secours Radiotherapy Cork in partnership with UPMC Hillman Cancer Centre; 🇮🇪 Cork, Ireland

St Lukes Radiation Oncology Network; 🇮🇪 Dublin, Ireland

Mid Western Radiation Oncology Centre; 🇮🇪 Limerick, Ireland

Auckland Hospital; 🇳🇿 Auckland, New Zealand

Worcestershire Acute Hospitals Nhs Trust; 🇬🇧 Worcester, Worcestershire, United Kingdom

Belfast City Hospital; 🇬🇧 Belfast, United Kingdom

Bristol Haematology and Oncology Centre; 🇬🇧 Bristol, United Kingdom

West Suffolk NHS Foundation Trust; 🇬🇧 Bury Saint Edmunds, United Kingdom

Addenbrookes Hospital; 🇬🇧 Cambridge, United Kingdom

Velindre Cancer Centre; 🇬🇧 Cardiff, United Kingdom

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