Radiation Therapy Center
Radiation Therapy Center
Heyd R.,Offenbach Hospital |
Micke O.,Franziskus Hospital |
Surholt C.,Ansbach Hospital |
Berger B.,University of Tübingen |
And 4 more authors.
International Journal of Radiation Oncology Biology Physics | Year: 2011
Purpose: The German Cooperative Group on Radiotherapy for Benign Diseases conducted a national patterns-of-care study to investigate the value of radiation therapy (RT) in the management of Gorham-Stout syndrome. Methods and Materials: In 2009 a structured questionnaire was circulated to 230 German RT institutions to assess information about the number of patients, the RT indication and technique, and the target volume definition, as well as accompanying treatments, outcome data, and early or late radiation toxicity. Results: In November 2009 responses were available from 197 departments (85.6%): 29 university hospitals (14.7%), 89 community hospitals (45.2%), and 79 private RT offices (40.1%). Of these institutions, 8 (4.0%) had experience using RT, for a total of 10 cases in various anatomic sites. Four patients underwent irradiation postoperatively, and six patients received primary RT. The total doses applied after computed tomography-based treatment planning ranged from 30 to 45 Gy. After a median follow-up period of 42 months, local disease progression was avoided in 8 cases (80.0%). In 2 of these cases a progression occurred beyond the target volume. Acute and late toxicity was mild; in 4 patients RT was associated with Grade I side effects according to Radiation Therapy Oncology Group/European Organisation for Research and Treatment of Cancer criteria. The literature analysis of 38 previously published articles providing results after the use of RT in 44 patients showed stable or regressive disease in 77.3%. Conclusions: RT may prevent disease progression effectively in Gorham-Stout syndrome in 77% to 80% of cases. Total doses ranging from 30 to 45 Gy applied after computed tomography-based treatment planning are recommended. © 2011 Elsevier Inc.
PubMed | Foundation Laboratory, Beijing Big Base Top Grade Equipment Co. and Radiation Therapy Center
Type: Journal Article | Journal: International journal of clinical and experimental medicine | Year: 2015
To study the role of protoporphyrin IX (pPIX) in mitochondrial metabolism of hydrogen peroxide (H2O2).O2 (-) specific fluorescent markers DMA (9,10-dimerthylanthracence) and SOSG (Singlet Oxygen Sensor Green reagent) were used for measurement of singlet oxygen ((1)O2). Catalyzing conversion of H2O2 into (1)O2 by pPIX was monitored in vitro under varied H2O2 content, temperature, and PH value in the reaction. Ex vivo mitochondrial model was used to analyze effects of ferrochelatase (FECH) and high energy X-rays on this catalytic reaction.In complete dark, measurable (1)O2 was generated when 1.5 mM of H2O2 was incubated with 24 M of pPIX H2O2 at 37C for 3 hours. Mitochondrial yield of H2O2 was 0.110.03 nmole/mg/min. Mitochondrial FECH significantly improve the catalytic ability of pPIX converting H2O2 into (1)O2. At presence of high-energy X-ray, incubation of 14.4 M of pPIX with 0.54 M of H2O2 also generated (1)O2, during which the fluorescence density of 1.05 M of DMA decreased by 41.5% (P < 0.05). This conversion was not observed when pPIX was replaced with structurally similar hematoporphyrin.pPIX can catalyze conversion of H2O2 into (1)O2.