ESTRO 2023 - Abstract Book

S1022

Digital Posters

ESTRO 2023

Results A total of 47 patients were analysed and their baseline characteristics are reported in Table 1. For patients reconstructed with TE, median time to TE substitution was 17.75 months. Considering patients with an IBR with PI only 1 patient out of 17 required implant substitution after 20 months. Toxicity assessment of capsular contracture, in a radiotherapy and/or plastic surgeon FU, was available for 34 out of 47 patients (72.3%) with a median follow-up (FU) of 1.2 years (IQR 1.0-1.7), Data about capsular contracture were available for 32/34 patients, with 28 of them reporting Baker grade ≥ 2, data were missing for 2 patients.

Conclusion From the reported experience implant sparing RT using Halfmoon technique is technically feasible and preliminary data demonstrate an acceptable rate of capsular contracture. Data concerning additional toxicities and oncological outcomes are being retrieved.

PO-1279 Título * Deep-inspiration-breath-hold (DIBH) radiotherapy in patients with left-sided breast cancer.

C. de la Fuente Alonso 1 , B. Gil Haro 2 , J. Velasco 1 , M. López 1 , R. Benlloch 1 , I. Zapata 1 , S. Córdoba 1 , M. Hernández 1 , R. Rodriguez 3 , P. Sarrión 1 , S. Santana 1 , S. Pérez 1 , F.J. Martínez 1 , J. Romero 1 1 Hospital Puerta de Hierro Majadahonda, Radiation Oncology, Madrid, Spain; 2 Hospital Puerta de Hierro Majadahonda, Radiation Oncology,, Madrid, Spain; 3 Hospital Puerta de Hierro Majadahonda, Medical Physics, Madrid, Spain Purpose or Objective Adjuvant radiation therapy in breast cancer reduces the risk of local recurrence and breast cancer-specific mortality. Heart to radiation increases the subsequent rate of ischemic heart disease and it is proportional to the mean dose to the heart. There is enough evidence that DIBH decreases the mean radiotherapy heart dose when compared with free breathing and it not reduces the target coverage of whole-breast radiotherapy. The aim of this study is to evaluate the heart dose using DIBH for patients with left-sided breast cancer and to analyze the impact of clinical factors on mean heart dose (MHD). Materials and Methods A total of 276 patients with breast left cancer who underwent radiotherapy with DIBH at our institution from Nov 2018 to May 2022 were included. We statistically analyzed the average dose in the heart and its relationship with other individual factors. The patients characteristics are described in Table 1.

Statistics: t-Student, ANOVA.