ESTRO 2024 - Abstract Book

S1941

Clinical - Mixed sites, palliation

ESTRO 2024

Stephen Harrow, MBChB, PhD, David A. Palma, MD, PhD et al. Stereotactic radiation for comprehensive treatment of oligometastases (SABR-COMET): Extended long-term outcomes. Int J Radiation Oncol Biol Phys. 2022; 114:611 616.

Eric J.Lehrer, MD, MS, Raj Singh, MD et al. Safety and survival rates associated with ablative stereotactic radiotherapy for patients with oligometastatic cancer. JAMA Oncol. 2020; 7(1): 1-15.

1709

Digital Poster

Online adaptive radiation magnetic resonance-guided radiotherapy: current implementation in Spain

Beatriz Debén Méndez 1 , Inmaculada Navarro-Domenech 1 , Rafael Rosel Aller 1 , Concepción Huertas Martinez 2 , Carlos Luis Ferrer Gracia 2 , Patricia Arroyo Corral 3 , Beatriz Sánchez Vilela 3 , Antonio Lozano Serrano 3 , Daniel Camacho Martínez 3 , Elisabet González Del Portillo 1 , Marta Rodríguez Roldán 1 , Maria Isabel Garrido Botella 1 , Abrahams Alexis Ocanto Martinez 4 , Mercedes González Cantero 1 , Macarena Teja Ubach 4 , Celia García Torres 5 , Rosa María Morera López 1 1 Hospital Universitario La Paz, Radiation oncology, Madrid, Spain. 2 Hospital Universitario La Paz, Radiophysics, Madrid, Spain. 3 Hospital Universitario La Paz, Radiotherapy superior technician, Madrid, Spain. 4 Genesis care, Radiation oncology, Madrid, Spain. 5 Hospital Móstoles, Radiation oncology, Madrid, Spain

Purpose/Objective:

The innovative magnetic resonance-guided linear accelerator (MR-Linac) is a state-of-the-art treatment technology that allows guiding radiation treatment in real time. Radiation is delivered to the target with enhanced precision, while minimizing the dose to the organ at risk (OAR). Currently, there is only one Elekta Unity unit in Spain. We report our experience within the last year.

Material/Methods:

This is a single institution analysis to report clinical activity at MR-Linac. A team of radiation therapist, physicists and physicians composes the unit. During the treatment, two physicians, 1 physicist and 2 technicians are involved in the workflow. The MR-Linac uses two primary workflows: adapt-to-position (ATP) and adapt-to-shape (ATS). The activity has increased over the past few months with 4-6 patients currently scheduled on the unit each day during a work shift. We performed a descriptive analysis of simulated and treated patients from the last 9 months.

Results:

Eighty-eight treatments have been simulated and 589 radiotherapy fractions delivered. The primary diagnoses included oligometastatic disease (OMD) in 43 cases (49%), prostate cancer in 29 cases (33%), and rectal cancer in 13 cases (15%), figure 1. There were also a few less frequent cases of breast cancer, pancreatic tumors, and lymphoma.