ESTRO 2025 - Abstract Book

S272

Brachytherapy - Gynaecology

ESTRO 2025

Figure 1: Scatter diagram representing patient distribution with respect to dose constraints of D 2cc rectum versus standard pan (left) and with optimized plan (right). The green area represents the number of patients who achieved all hard constraints. Conclusion: This study indicates that HRCTV volume is an independent influencing factor in deciding which patients can benefit from CT-based contouring and planning. HRCTV optimization gives a better therapeutic advantage in selected patients in centers where interstitial needles are limited. Careful HRCTV delineation and patient selection make CT based IGABT an alternative to MR-based IGABT in resource-limited settings.

Keywords: Adaptive Brachytherapy, Cervical cancer

References: 1.

Mahantshetty U, Poetter R, Beriwal S, Grover S, Lavanya G, Rai B, et al. IBS-GEC ESTRO-ABS recommendations for CT based contouring in image guided adaptive brachytherapy for cervical cancer. Radiother Oncol J Eur Soc Ther Radiol Oncol. 2021 Jul;160:273–84. 2. Tanderup K, Nesvacil N, Kirchheiner K, Serban M, Spampinato S, Jensen NBK, et al. Evidence-Based Dose Planning Aims and Dose Prescription in Image-Guided Brachytherapy Combined With Radiochemotherapy in Locally Advanced Cervical Cancer. Semin Radiat Oncol. 2020 Oct;30(4):311–27.

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Digital Poster Long-term outcomes of image-guided adaptive brachytherapy in cervical cancer: Analysis of a Chilean cohort Francisco Perez Peña 1 , Tomas Walter Martin 1 , Darlett Folch Mora 1 , Jose Solis Campo 1,2 , Anais Molina Carcamo 3 , Florencia Olivares Dubal 3 , Josefa Giusti-Bilz Schäffer 3 , Ilan Perrot Rosenberg 1,2 , Benjamin Tudela Staub 1,2 , Gabriel Veillon Contreras 1,2 , Ximena Quintela Dávila 1,2 , Gabriel Lazcano Álvarez 1,2 1 Radiation Oncology, Universidad de Valparaiso, Valparaiso, Chile. 2 Oncology, Hospital Carlos Van Buren, Valparaiso, Chile. 3 School Of Medicine, Universidad de Valparaiso, Valparaiso, Chile