Outcomes of Patients Treated in the UK Proton Overseas Programme: Non-central Nervous System Group

The UK Proton Overseas Programme (POP) was launched in 2008. The Proton Clinical Outcomes Unit (PCOU) warehouses a centralised registry for collection, curation and analysis of all outcomes data for all National Health Service-funded UK patients referred and treated abroad with proton beam therapy (PBT) via the POP. Outcomes are reported and analysed here for patients diagnosed with non-central nervous system tumours treated from 2008 to September 2020 via the POP. All non-central nervous system tumour files for treatments as of 30 September 2020 were interrogated for follow-up information, and type (following CTCAE v4) and time of onset of any late (>90 days post-PBT completion) grade 3–5 toxicities. Four hundred and ninety-five patients were analysed. The median follow-up was 2.1 years (0–9.3 years). The median age was 11 years (0–69 years). 70.3% of patients were paediatric (