ESTRO 2023 - Abstract Book

S1039

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ESTRO 2023

compared with conventional fractionation. However, fractionation seems to differ between RT Departments, particularly regarding RNI. Our objective is to describe the practices reported by different Departments.

Materials and Methods An online survey (by Google Forms) consisting on 8 questions about the clinical vignette (vide figure) was shared through groups of Radiation Oncologists (RO) on social networks to collect data regarding target volume selection and fractionation schemes. Data was collected from the 11th February 2022, with analysis performed after data lock on the 28th June 2022. The subject was a healthy 65-years old female without any comorbidities, with a cT2cN1 luminal B-like Her2 negative invasive BC, with complete pathological response after NST, submitted to Breast Conservative Surgery and ALND.

Results In total, 241 respondents from 44 different countries completed the survey reporting their experiences. The most represented countries and groups were India 14.4%, Spain 14%, Portugal 9.8% and USA 8.9%; 76.9% were RO, 9.4% medical oncologists and 13.7% other healthcare professionals. About one third (33.6%) of the physicians had 0-5 years of practice, while 16.8% had >15 years. The minority (15.1%) were medical residents and for 77.8% BC was the area of expertise. Most would consider RNI in this patient (n = 148; 63%). Those who would not consider RNI, would change their approaches in case of breast partial pathologic response (7.7%), triple negative subtype (5.7%), patient < 40 years old (4.1%) and