ESTRO 2021 Abstract Book

S1041

ESTRO 2021

Conclusion The results of this study supports a promising role of delta radiomics analysis on low-field MR images in predicting 2yDFS for LARC pts. Further analyses including larger cohort of pts and external validation sets are needed to confirm these preliminary results. PO-1262 Outcomes in locally recurrent rectal cancer treated with reirradiation stereotactic ablative radiotherapy (SABR) R. Muirhead 1,1 , K. Aitken 2 , J. Holmes 3 , M. Harrison 4 , D. Harji 5 , S. O'Cathail 6 , C. Taylor 7 , M. Wing 8 1 Oxford University Hospitals NHS Foundation Trust, Department of Oncology, Oxford, United Kingdom; 2 The