S2847
RTT - RTT education, training, and advanced practice
ESTRO 2026
buttocks. Assessment and photo documentation of the skin took place at start, during, at the end of, and 3 months after end of radiotherapy. A dose measurement with film was performed for patients with increased CTCEA during treatment. Skin care instructions, including verbal information about cleanliness, hygiene, aeration and hydration of the skin, were given when CTCAE >2 in any criteria. Results: A total of 30 patients were included between January and November 2024 (Fig. 1). Grade 2 skin reactions were seen between and/or on the buttocks for 17 patients (57%), nine (30%) of whom had a Grade>1 at start of radiotherapy. Grade > 1 skin reactions were noted in the groin area in 14 patients (47%), whereof 12 were classified as hygiene/heat related. Three patients did not complete their three-month follow- up.Pruritus, pain of skin or ulceration were not seen in the study population. For 14 patients (47%) an increase in CTCAE were observed (Fig 2) and subsequent film measurement was performed. A mean [range] absolute dose difference of 0.2Gy [-0.2– 0.8] was seen between treatment plan and measured film dose. Skin care instructions resulted in reduced tissue disorder symptoms for 16 patients.
Conclusion: Skin reactions are prevalent during VMAT-treatments of the prostate. The reactions, seen at varying time points during treatment, are hypothesised to be a combination of skin care and radiotherapy. Skin care instructions effectively reduce symptoms of tissue disorders, which is in line with recently published ESTRO recommendations on radiodermatitis [2]. As a result, our local standardized skin care instructions have been extended to include all pelvic patients, and we encourage other centers to include skin care as part of their patient’s plan of care. Keywords: Radiodermatitis, skin care, prostate cancer References: [1] Institute NC. Common Terminology Criteria for Adverse Events (CTCAE) Version 5. US Department of Health and Human Services, National Institutes of Health, National Cancer Institute; 2017[2] Forde E. et al. Practical recommendations for the management of
radiodermatitis on behalf of the ESTRO RTT committee. Radiation Oncology, (2025) 20:46
Digital Poster Highlight 887
Influence of Different Bladder Volumes on Setup Errors in Prone Position Radiotherapy for Pelvic Tumors Pengfei Yang, Zhichao Xie, Yiming Wang, Rong Hu, Bo Huang Radiation Oncology, Peking University Shenzhen Hospital, ShenZhen, China Purpose/Objective: To analyze the impact of different bladder volumes on setup errors in pelvic tumor patients undergoing radiotherapy in the prone position. Material/Methods:
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