%0 Journal Article %T Efficacy and Toxicity of Robotic Stereotactic Body Radiotherapy of Lung Metastases in Patients With Oligometastatic Disease. %A Rosenbrock J %A Lieser A %A Ostermann-Myrau J %A Judge M %A Linde P %A Claus K %A Marnitz S %A Kocher M %A Baues C %A Celik E %J Anticancer Res %V 43 %N 9 %D 2023 Sep %M 37648304 %F 2.435 %R 10.21873/anticanres.16602 %X BACKGROUND: Stereotactic body radiotherapy is a locally effective treatment for lung metastases in patients with oligometastatic disease, a modern variant of which is robotic (rSBRT). Since it is unclear which factors determine the success of rSBRT, we investigated a cohort of patients with lung metastases treated with rSBRT.
METHODS: In our retrospective single-center analysis, we included patients with oligometastatic disease of different cancer types who underwent SBRT of lung metastases using an Accuray Cyberknife® device between 2012 and 2019. We evaluated local control rate (LC), progression-free (PFS) and overall (OS) survival, and toxicity. Multivariate analysis was performed to identify independent factors associated with the efficacy and toxicity of rSBRT.
RESULTS: A total of 70 lung metastases of 54 patients were evaluated. The 4-year Kaplan-Meier estimate for LC, PFS and OS were 72.0%, 12.4% and 49.7%, respectively. Cox regression showed that LC of metastases of colorectal carcinoma and metastases treated with a biological effective dose at an α/β-ratio of 10 (BED10) of <100 Gy was significantly worse than for other metastases. Patients suffered from grade I-II pneumonitis in 21.4% of cases treated with rSBRT (grade I: 20.0%; grade II: 1.4%).
CONCLUSIONS: rSBRT is an effective and safe therapy for lung metastases. A BED10 of >100 Gy should be aimed for, especially for potentially radioresistant histologies such as colorectal carcinoma.