ESTRO 2025 - Abstract Book

S2238

Interdisciplinary – Global health

ESTRO 2025

radiotherapy. Advances in precision imaging, radiotherapy delivery, molecular profiling, omics and the use of systemic treatments have all recently been incorporated into sarcoma management. The annual ESTRO congress is an important forum to discuss new developments and disseminated knowledge to the oncology community. The purpose of this study was to assess the prevalence and trends in sarcoma abstracts presented at annual ESTRO congresses in the last 9 years. Material/Methods: Online ESTRO abstract books from 2016-2024 were independently reviewed by two researchers to identify abstracts related to sarcoma. Abstracts were included if they included any of the terms: “sarcoma” and / or “chordoma”. Abstracts were excluded if they referred to multiple histologies, uterine sarcomas/ gastrointestinal stromal tumors (GIST) and skin sarcomas. The numbers of teaching lectures, oral, and poster abstracts were recorded. Abstracts were categorized as pertaining to soft tissue sarcoma and/or bone sarcoma; clinical, physics, or radiobiology research; radiotherapy technique (external beam, brachytherapy, protons and heavy ions); adults and paediatric population; and if data was collected prospective or retrospectively. Data were reported using descriptive statistics (mean, range and percentages). Results: An average of 0.88% (180/20350; range 0.6-1.2%) of abstracts presented per ESTRO congress over the nine-year study period were related to sarcoma. A total of 180 abstracts were identified: 14 teaching lectures, 34 oral, and 131 poster presentations. Of the total, 137 (76.1%) were related to soft tissue sarcoma, and 49 (27.2%) to bone sarcoma research. 155 (86.1%) abstracts were related to clinical care, 14 (7.8%) to physics, and 6 (3.3%) to radiobiology research. External beam radiotherapy related abstracts (130, 72.2%) were more prevalent than those pertaining to brachytherapy (17, 9.4%) or exclusive to proton/heavy ions (27, 15.0%). Ten (5.5%) of abstracts pertained to the pediatric population. Only 11 (6.1%) abstracts involved prospectively collected data. Conclusion: Sarcoma research and education is poorly represented at the annual ESTRO congress, representing only 0.88% of abstracts presented. The number remains stable over the analysed nine-year period. This is in striking contrast to the number of patients with sarcoma seen in clinical practice, and recent developments in radiotherapy delivery and immunotherapy and targeted therapy. Poster Discussion Radiotherapy in Ukraine: Resilience Amid the Ravages of War Ruslan Zelinskyi 1 , Larysa Stadnyk 2 , Serhii Brovchuk 3,4 , Viktor Iakovenko 5 , Zoia Shepil 4 , Yuliia Lozko 6 , Natalka Suchowerska 7 , Nataliya Kovalchuk 8 1 Medical Physics, Spizhenko Clinic, Kyiv, Ukraine. 2 Central Laboratory of Radiation Safety and Dosimetry of Medical Exposure, Grigorev Institute for Medical Radiology and Oncology, Kharkiv, Ukraine. 3 Radiation therapy, LISOD - Hospital of Israeli oncology,, Kyiv, Ukraine. 4 Radiation therapy, State Institution «National Scientific Center of Surgery and Transplantation named after O.O. Shalimov to National Academy of Medical Sciences of Ukraine», Kyiv, Ukraine. 5 Radiation Oncology, University of Texas Southwestern Medical Center, Dallas, Ukraine. 6 Radiation therapy, National Cancer Institute, Kyiv, Ukraine. 7 Medical Physics, The University of Sydney, Sydney, Australia. 8 Radiation Oncology, Stanford University, Stanford, USA Purpose/Objective: To evaluate the impact of full-scale the war on radiotherapy (RT) services in Ukraine and determine largest areas of need to sustain RT capacity during the ongoing conflict. Keywords: sarcoma 2162