1 Title page Title: Stereotactic ablative body radiotherapy in patients with oligometastatic cancers: a national prospective, single-arm, evaluation study. Authors: Anastasia Chalkidou, Thomas Macmillan, Mariusz T. Grzeda, Janet Peacock, Jennifer Summers, Saskia Eddy, Bola Coker, Hannah Patrick, Helen Powell, Lee Berry, Gareth Webster, Peter Ostler, Peter Dickinson, Matthew Hatton, Ann Henry, Stephen Keevil, Maria A. Hawkins, Nick Slevin, Nicholas Van As Correspondence to: Dr Anastasia Chalkidou, King’s Technology Evaluation Centre, London, SE1 7EU, United Kingdom, email: anastasia.chalkidou@kcl.ac.uk Anastasia Chalkidou, PhD, King’s Technology Evaluation Centre, King’s College London, WC2R 2LS, UK Thomas Macmillan, MSc, King’s Technology Evaluation Centre, King’s College London, WC2R 2LS, UK Mariusz T. Grzeda, MSc, King’s Technology Evaluation Centre, King’s College London, WC2R 2LS, UK Saskia Eddy, MSc, School of Population Health and Environmental Sciences, Faculty of Life Sciences & Medicine, King's College London, WC2R 2LS, UK Bola Coker, MSc, School of Population Health and Environmental Sciences, Faculty of Life Sciences & Medicine, King's College London, WC2R 2LS, UK Jennifer Summers, PhD, School of Population Health and Environmental Sciences, Faculty of Life Sciences & Medicine, King's College London, WC2R 2LS, UK Janet Peacock, PhD, School of Population Health and Environmental Sciences, Faculty of Life Sciences & Medicine, King's College London, WC2R 2LS, UK Hannah Patrick, FFPHM, National Institute for Health and Care Excellence (NICE), Manchester, M14BT, UK Helen Powell, PhD, National Institute for Health and Care Excellence (NICE), Manchester, M14BT, UK Lee Berry, MSP Practitioner, National Institute for Health and Care Excellence (NICE), Manchester, M14BT, UK Gareth Webster, PhD, Department of Medical Physics, Worcestershire Acute Hospitals NHS Trust, WR5 1DD, UK Peter Ostler, FRCR, Mount Vernon Cancer Centre, HA6 2RN, UK Peter D Dickinson, FRCR, Leeds Teaching Hospitals NHS Trust, Dept of Clinical Oncology, Level 4 Bexley Wing, St James’ University Hospital, Beckett St, Leeds, LS9 7TF, UK Matthew Q Hatton, FRCR. Dept of Clinical Oncology, Weston Park Hospital, S10 2SJ, UK Ann Henry, MD. Department of Clinical Oncology, Bexley Wing, St James’s University Hospital Leeds and University of Leeds, LS9 7TF, UK Stephen Keevil, PhD, King’s Technology Evaluation Centre, King’s College London, WC2R 2LS, UK Nick Slevin, FRCR, The Christie NHS Foundation Trust, M20 4BX, UK Maria A. Hawkins, FRCR Department of Medical Physics and Biomedical Engineering, University College London, London, UK