S1362
Interdisciplinary - Global health
ESTRO 2026
(80% reduction) in all our patients. According to the ReCiPe model (3), a treatment resulting in incremental emissions of 8 tCO ₂ eq is estimated to cause a future loss of 0.1 disability-adjusted life years (DALYs) in the future. Based on numbers from the Radiotherapy Data Set in 2024 collected by the National Disease Registration Service at NHS England (4), adopting a five-fraction EBRT regimen in endometrial cancer across England could reduce this loss by approximately 0.8 DALYs, primarily through decreased transport requirements and reduced use of consumables.
Guy's & St Thomas’ NHS Foundation Trust, London, United Kingdom
Purpose/Objective: The environmental impact of cancer treatment is gaining increasing attention, yet the carbon footprint of external beam radiotherapy (EBRT) for specific subsites including gynaecological malignancies remains poorly characterised. Quantifying the main contributors to carbon dioxide equivalent (CO ₂ eq) emissions in pelvic EBRT for endometrial cancer can help identify opportunities for emission reduction and guide more sustainable oncology practices. Material/Methods: We calculated the carbon emissions associated with a standard course of pelvic EBRT for endometrial cancer. Data were collected for all patients with endometrial cancer treated at our centre in 2024 following multidisciplinary meeting discussion. Analysis included direct emissions (e.g., equipment use, energy consumption, and maintenance) and indirect emissions(e.g., patient and staff transportation, building infrastructure, and medical consumables). Results: Of 212 patients with a new diagnosis of endometrial cancer discussed at MDM in 2024, 74 received adjuvant pelvic EBRT. A complete course of pelvic EBRT for endometrial cancer was associated with an estimated carbon emission of 96.8 KgCO ₂ eq per patient. Over the course of one year, the total carbon emissions from pelvic EBRT for endometrial cancer at our centre was approximately 7164.3KgCO ₂ eq.The major contributors to emissions were patient transport (52.9%) and linear accelerator construction and maintenance (20.8%).
Conclusion: Pelvic EBRT for endometrial cancer contributes a measurable carbon footprint, largely driven by equipment-related processes and patient transportation. Integrating environmental considerations into treatment planning supports hypofractionation and operational efficiencies to cut emissions while maintaining outcomes, promoting sustainability in radiotherapy and oncology. References: 1. Dupraz C et al. The carbon footprint of external beam radiotherapy and its impact in health technology assessment. Clin Transl Radiat Oncol. 2024 Jul 31;48:100834. doi: 10.1016/j.ctro.2024.100834. 2. Ali D et al. Methodological guide for assessing the carbon footprint of external beam radiotherapy: A single- center study with quantified mitigation strategies. Clin Transl Radiat Oncol. 2024 Mar 28;46:100768. doi: 10.1016/j.ctro.2024.100768. 3. Huijbregts MAJ et al. ReCiPe2016: a harmonised life cycle impact assessment method at midpoint and endpoint level. Int J Life Cycle Assess 2017;22. https://doi.org/10.1007/s11367- 016-1246-y.4. Radiotherapy Data Set (RTDS). https://digital.nhs.uk/ndrs/data/data-sets/rtds Keywords: Carbon footprint, Endometrial cancer Digital Poster Highlight 3248 Mental Health Project: a prospective study on all French residents in radiation oncology Audrey Larnaudie 1,2 , Youssef Ghannam 3 , Anne Laprie 4,5 , Sabrina Aziez 6 , Charles Raynaud 3,2 , Malik Nebbache 7,2 , Eva Bisson 6,2 , Véronique Vendrely 8,9 ,
Reducing the number of fractions is one of the most important mitigation strategies (1,2). Although carbon emission per fraction can be higher with hypofractionation, reducing the number of fractions reduces the carbon footprint of a treatment strategy almost linearly (1). We estimated a decrease of 3,032.9 KgCO2eq and 65.3 KgCO2eq in patient and staff transport respectively and 522.7 KgCO2eq in medical consumables if we were to adopt a 5-fraction regimen
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