Gamze Ugurluer , Famke L. Schneiders , Stefanie Corradini , Luca Boldrini , Rupesh Kotecha , Patrick Kelly , Lorraine Portelance , Philip Camilleri , Merav A. Ben-David , Spencer Poiset , Sebastian N. Marschner , Giulia Panza , Tugce Kutuk , Miguel A. Palacios , Alessandra Castelluccia , Teuta Zoto Mustafayev , Banu Atalar , Suresh Senan , Enis Ozyar
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引用次数: 0
Abstract
Purpose
Stereotactic body radiotherapy (SBRT) is an effective treatment for adrenal gland metastases, but it is technically challenging and there are concerns about toxicity. We performed a multi-institutional pooled retrospective analysis to study clinical outcomes and toxicities after MR-guided SBRT (MRgSBRT) using for adrenal gland metastases.
Methods and Materials
Clinical and dosimetric data of patients treated with MRgSBRT on a 0.35 T MR-Linac at 11 institutions between 2016 and 2022 were analyzed. Local control (LC), local progression-free survival (LPFS), distant progression-free survival (DPFS) and overall survival (OS) were estimated using Kaplan-Meier method and log-rank test.
Results
A total of 255 patients (269 adrenal metastases) were included. Metastatic pattern was solitary in 25.9 % and oligometastatic in 58.0 % of patients. Median total dose was 45 Gy (range, 16–60 Gy) in a median of 5 fractions, and the median BED10 was 100 Gy (range, 37.5–132.0 Gy). Adaptation was done in 87.4 % of delivered fractions based on the individual clinicians' judgement. The 1- and 2- year LPFS rates were 94.0 % (95 % CI: 90.7–97.3 %) and 88.3 % (95 % CI: 82.4–94.2 %), respectively and only 2 patients (0.8 %) experienced grade 3 + toxicity. No local recurrences were observed after treatment to a total dose of BED10 > 100 Gy, with single fraction or fractional dose of > 10 Gy.
Conclusions
This is a large retrospective multi-institutional study to evaluate the treatment outcomes and toxicities with MRgSBRT in over 250 patients, demonstrating the need for frequent adaptation in 87.4 % of delivered fractions to achieve a 1- year LPFS rate of 94 % and less than 1 % rate of grade 3 + toxicity. Outcomes analysis in 269 adrenal lesions revealed improved outcomes with delivery of a BED10 > 100 Gy, use of single fraction SBRT and with fraction doses > 10 Gy, providing benchmarks for future clinical trials.
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