• Male aged 18 years or older at screening

• Patient has provided written informed consent

• Histologically confirmed prostate adenocarcinoma w

• Prior definitive treatment of the primary with either curative intent radiotherapy and/or surgery

• Patient has 1-5 sites of nodal or bony metastases on 68Ga-PSMA or 18F-DCFPyL PET/CT

• Adequate haematological function as defined by:

‣ Absolute neutrophil count (ANC) ≥1.5 x 109/L

⁃ Platelet count \>150x 109/L

⁃ Haemoglobin ≥100 g/L

⁃ Creatinine Clearance ≥ 40mL/min (Cockcroft-Gault formula)

• Assessed as suitable for SABR by a radiation oncologist

• Patients must agree to use an adequate method of contraception

• Have a performance status of 0-1 on the ECOG Performance Scale