Introduction Stereotactic body radiotherapy (SBRT) delivered on an MRI-guided linear accelerator (MR-linac) enables highly conformal prostate cancer irradiation. The DESTINATION 2 trial is a federated, randomised phase II/R-IDEAL 2b study evaluating whether de-escalating the dose to prostate tissue, while maintaining a high dose to MRI-visible tumour(s) in two fractions, reduces genitourinary (GU) treatment-related adverse events (AE) without compromising disease control in men with localised prostate cancer.
Methods 200 men worldwide with localised, MRI-visible prostate cancer will be randomised 1:1 to receive either (1) prescribed uniform dose MR-linac SBRT (27 Gy in two fractions to the whole prostate and seminal vesicles with 0 mm CTV-PTV margin) or (2) de-escalated SBRT (20 Gy in two fractions to whole prostate with 0 mm CTV-PTV margin and 27 Gy in two fractions to MRI-visible tumour(s) with a 4 mm intraprostatic margin applied to the GTV. All treatments are delivered using MRI-guided adaptive Radiotherapy (MRIgRT).
The primary endpoint is the absolute and relative risk reduction in acute grade 2+GU AE (CTCAE v5) within 12 weeks of completing radiotherapy.
BMJ Open published a clinical update in Research Highlights on 07 May 2026.
The item focuses on Dose dE-eScalaTion IN prostATe radIOtherapy usiNg an MR-Linac in 2 Fractions (DESTINATION 2): protocol for a randomised, phase II/R-IDEAL2b trial.
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