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• W2405998524 abstract "Aim: We conducted a retrospective study to report on the outcome and toxicity of stereotactic body radiotherapy (SBRT) and to analyze the correlation of local control (LC) and biological equivalent dose (BED) of patients treated with SBRT for upper abdominal lesions.Methods: Patients who completed stereotactic radiotherapy treatment between 05/2007 and 03/2012 were enrolled into the analysis. Different fractionation regimens depending on the dose to organs at risk (OAR) were given. The primary endpoint was LC determined on imaging studies. Toxicities were classified according to CTCAE v4. Physical dose was converted into BED (α / β = 10 Gy) and a tumor control probability model (TCP) was used for dose-response relationship. For outcome analyses the Kaplan-Meier method and log rank tests were used.Results: Forty-two patients were treated with SBRT. Thirty-three patients with 39 lesions were evaluable for further analysis with a median follow-up of 15.2 months. Lesions were located in liver (n = 28), hepatic hilum (n = 8), nodal (n = 2), adrenal (n = 2) and pancreatic head (n = 1). Local failure was observed in 7 lesions at a mean time of 7.3 months (range, 1.5 - 17.9) resulting in a LC rate of 83% at one year and 63% at two years. No significant difference for intra- vs extrahepatic lesions was observed. Lesions treated with a BED ≥ 59.5 Gy had a better LC vs. lesions treated with a BED < 59.5 Gy (88% vs. 68%, p = 0.027). Median overall survival was 14.5 months (2 - 32.5). Observed toxicities were mild (grade 2 in 4 patients, grade 3 in 1 patient).Conclusion: Upper abdominal SBRT is well tolerated and results in excellent local control if BED is ≥ 59.5 Gy. We therefore propose to aim for doses at or above this BED." @default.
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• W2405998524 date "2016-01-01" @default.
• W2405998524 modified "2023-09-26" @default.
• W2405998524 title "Abdominal Stereotactic Body Radiotherapy: Local Control and Correlation to Biologically Equivalent Dose" @default.
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• W2405998524 doi "https://doi.org/10.4172/2167-7964.1000216" @default.
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