S256
Clinical - Breast
ESTRO 2026
limiting the posterolateral border, excluding the ribs and skin. Figure 1 provides an illustration of the consequence of reduced volume in contouring in radiotherapy planning by adding a tangential line to the pre- and post-workshop contours from a
completed contouring before the first educational session, while five contoured between sessions. Here, we analyse delineations of a right- sided BC patient with pT3G3N1a invasive lobular carcinoma treated with upfront mastectomy. Participants were invited to contour the Chest Wall (CW) and axillary lymph node Levels I-IV. SPSS was used to perform basic descriptive analysis and the nonparametric Wilcoxon test. The DICE similarity coefficient was used to evaluate the participants' contours. The DICE index ranges from 0 to 1, with 1 indicating a perfect match and 0 no overlap between two sets of data. Results:
participant. Conclusion:
This example from the FALCON BC online workshop illustrates how an easily accessible online education can help improve contouring skills. Also, improved conformity in contouring of target volumes in BC radiotherapy is very likely to have had a considerable effect on the planned and delivered dose to organs of interest for a huge number of patients worldwide. Keywords: Contouring, FALCON, educase Poster Discussion 1741 Quality Indicators for Hypofractionated Breast Radiation Therapy: A international Delphi Consensus Study Endorsed by the ESTRO Breast Focus Group Mouhamadou Bachir BA 1 , Samantha Dicuonzo 2 , Meritxell Arenas 3 , Gianfranco Brusadin 4 , Cynthia Aristei 5 , Charlotte Coles 6 , Liesbeth Boersma 7 , Sofia Rivera 1 1 Radiotherapy, Gustave Roussy Institute, Villejuif, France. 2 Department of Radiotherapy, European Institute of Oncology, IRCCS, Milan, Italy. 3 Radiation Oncology Department, Hospital Universitari Sant Joan de Reus. University of Rovira i Virgili, Reus, Spain. 4 Quality and Risk Management Department, Gustave Roussy Institute, Villejuif, France. 5 Radiation Oncology Department, University of Perugia and Perugia General Hospital, Perugia, Italy. 6 Department of Oncology, University of Cambridge, Cambridge, United Kingdom. 7 Maastricht Department of Radiation Oncology (Maastro), GROW Research Institute for Oncology and Reproduction, Maastricht University Medical Centre, Maastricht, Netherlands Purpose/Objective: Hypofractionated radiotherapy is the standard of care for most breast cancer indications, yet global practice patterns are heterogeneous. To foster harmonization and quality improvement, this study aimed to develop and validate a core set of clinically relevant, evidence- based, retrievable and usable Quality Indicators (QIs) for hypofractionated radiotherapy in breast cancer. Material/Methods: A three-step methodological approach was conducted. A structured search was performed in PubMed and Google Scholar (2010 - 2025) using keywords "Breast cancer", "Quality Indicator", "Radiotherapy" AND "Hypofractionation", complemented by major international guidelines (ESTRO, ASTRO, NCCN,
Among the 21 participants with pre- and post-workshop contours, the CW was contoured twice by 17 participants, level I by 14, level II by 12, level III by 11, and level IV by 11. Improvement in the median DICE scores and volumes of CW and axillary lymph node levels were presented in Table 1. We observed at least a 10-point improvement in the DICE score between the pre- and post-workshop contours. The most significant improvement in DICE scores was observed in level IV. (Median DICE score improved from 0.28 to 0.55). By visual evaluation, the most critical improvement in CW contouring was observed by
Made with FlippingBook - Share PDF online