PSMA MRI Guided Prostate SBRT (ARGOS)/Comprehensive, Longitudinal Evaluation of Imaging Biomarkers Post Radiotherapy (CLIMBER) (ARGOS/CLIMBER)

  • End date
    Jun 28, 2028
  • participants needed
  • sponsor
    Lawson Health Research Institute
Updated on 28 May 2022


This study is a prospective Phase I/II protocol enrolling men with either high intermediate-risk or high-risk or very high-risk prostate cancer. All men will have PSMA Targeted PET (using the PSMA targeting ligand PSMA 1007) and multiparametric magnetic resonance imaging (mpMRI) for delineation of intra-prostatic foci of cancer and any involved regional lymph nodes based on high SUV uptake on PET or mpMRI (T2W, DWI/ADC, DCE) appearance suspicious for cancer. Tumour delineation will be performed by fusing the PSMA PET and mpMRI with planning CT simulation images. Fiducial marker implantation for treatment guidance will be mandatory but use of other organs at risk protection strategies (i.e. GU Loc, Space-OAR) will be allowed but not mandatory. Patients will be treated with image-guided SBRT using the fiducial markers for intra-fraction motion management. Dose escalation to imaging defined targets (intra-prostatic and involved nodes on PSMA PET + MRI) will be accomplished through a simultaneous boost technique. Maintaining dose to organs at risk will take precedence over boost dose targets (targeted maximum dose of 50Gy/5 fractions to imaging defined prostatic lesion; 35Gy/5 fractions to imaging defined involved nodes).

Condition Prostate Cancer
Treatment High Intermediate Risk Patients, High Risk or Very High-Risk Patients
Clinical Study IdentifierNCT05269550
SponsorLawson Health Research Institute
Last Modified on28 May 2022


Yes No Not Sure

Inclusion Criteria

Age > 18 years of age
Histologically confirmed carcinoma of the prostate
High-intermediate risk or high risk as defined by NCCN criteria
High intermediate: 2 or 4 intermediate risk factors (T2B-T2C, Gleason GG 2 or 3, PSA 10-20) or GG 3 or intermediate risk with equal or >50% biopsy core involvement
High-risk: one of T3a, Gleason GG 4 or 5, or PSA >20 ng/ml
Very-high risk: one of primary Gleason Pattern 5, >4 cores Grade Group 4 or 5, clinical T3b, or more than 1 high-risk feature
Conventional imaging (bone scan and abdominal pelvic computed tomography) negative for extra-pelvic nodal, skeletal or visceral metastases
Willing to give informed consent to participate in this clinical trial
Able and willing to complete EPIC questionnaires

Exclusion Criteria

Prior prostate cancer treatment (apart from prior 5-alpha reductase inhibitor treatment); androgen deprivation therapy prior to enrollment or treatment planning not permitted
Men with clinical T4 disease are excluded
Contraindication to radical prostate radiotherapy e.g. connective tissue disease or inflammatory bowel disease
Contraindication to prostate MRI (i.e. non0compatible stent, pacemaker, prosthesis, etc.)
Contraindication to use of PSMA PET agent PSMA 1007 due to intolerance or allergy
Anticoagulation medication (if unsafe to discontinue for gold seed insertion)
Diagnosis of bleeding diathesis
Poor baseline urinary function defined as a score of 5 ("big problem") on question 5 of the EPIC 26 (Overall, how big a problem has your urinary function been for you during the last 4 weeks?)
Definitive extra-pelvic nodal or distant metastatic disease on conventional staging investigations
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