Stereotactic radiotherapy for adrenal metastases: a multi-institutional review of patient characteristics and outcomes. Turkish Society for Radiation Oncology SBRT Group Study (TROD SBRT 10-004)

Oncology Research and Treatment

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Article / Publication Details Abstract

Introduction: This study aims to report the outcomes of SBRT for adrenal metastasis in a retrospective multi-institutional cohort. Methods: The outcomes of 124 patients with 146 adrenal metastases who underwent SBRT within 11 years (2008-2019) were retrospectively evaluated. Survival outcomes were analyzed by the Kaplan-Meier method. Patient, tumor, and treatment characteristics and their effects on survival, local control (LC), and toxicity outcomes were analyzed by log-rank and multivariate Cox regression methods. Results: The median age was 60 years. The most frequent primary tumor site was the lung, followed by the gastrointestinal system and breast. The adrenal gland was the only metastatic site in 49 (40%) patients. Median BED10 was 61 Gy. The overall LC rate was 83% and it was positively correlated with the BED10 and fraction dose. The 1- and 2-year local recurrence-free survival (LRFS), overall survival (OS) and progression-free survival (PFS) rate was 79% and 69%, 83% and 60%, and 31% and 12%, respectively. OS significantly improved with non-lung cancer and 65 Gy, and an isolated adrenal metastasis. Fourteen patients reported an acute toxicity and late toxicity was observed in three patients, including one grade 5. Conclusion: A satisfactory LC rate was achieved for adrenal metastasis via SBRT. A higher BED10 and fraction dose were positive prognostic factors for tumor control. However, the main problem is DM in these patients and systemic treatment options are needed to be improved.

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