Analysis of equivalent uniform dose (EUD) and conventional radiation treatment parameters after primary and re-irradiation of malignant glioma

Radiation Oncology

Ute Ganswindt¹  Claus Belka¹  Peter Lang¹  Silke B Nachbichler¹  Matthias Söhn¹  Ivan Karin¹  Maximilian Niyazi¹ 

[1] Department of Radiation Oncology, University of Munich, Marchioninistr. 15, Munich 81377, Germany

关键词: Radiation necrosis;    EUD;    Malignant glioma;    Re-irradiation;   

Others  :  829496
DOI  :  10.1186/1748-717X-8-287

 received in 2013-09-29, accepted in 2013-12-08,  发布年份 2013

【 摘 要 】

Background

Re-irradiation is a reasonable second treatment option for patients with recurrent malignant glioma (MG) after previous radio(chemo)therapy. However, only limited data is available allowing for a precise selection of patients suitable for re-treatment in regard to safety and efficacy.

Methods

Using the department database, 58 patients with two courses of percutaneous radiation were identified. Besides classical dose-volume histogram (DVH) parameters equivalent uniform dose (EUD) values were calculated for the tumor and organs at risk (OARs), retrospectively analyzed and correlated to survival outcome parameters. Cumulative EUD values were also calculated in all cases where previous OAR DVHs were available.

Results

Median follow-up was 265 days and no relevant toxicity was observed after re-irradiation in our patient cohort during follow-up. Time interval between first and second irradiation was regularly above 6 months. As a conservative estimation of the cumulative EUD to the OARs, the EUDs of first and second irradiation were added. Median cumulative EUD to the optic chiasm was 48.8 Gy (range, 2.5–76.5 Gy), 57.4 Gy (range, 2.7–75.3 Gy) to the brainstem, 20.9/22.1 Gy (range, 0.0–68.3 Gy) to the right/left optic nerve and 73.8 Gy (range, 64.9–77.3 Gy) to the brain. No correlation between treated volume and survival was seen.

Conclusions

This study provides retrospective estimates on cumulative doses at the OARs. EUD values are derived and may serve as reference for further studies, including planning studies where specific constraints are needed.

【 授权许可】

   
2013 Niyazi et al.; licensee BioMed Central Ltd.

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