References of "Strahlentherapie und Onkologie"
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See detailA dosimetric selectivity intercomparison of HDR brachytherapy, IMRT and helical tomotherapy in prostate cancer radiotherapy
Hermesse, Johanne ULg; Biver, Sylvie; JANSEN, Nicolas ULg et al

in Strahlentherapie und Onkologie (2009), 185(11), 736-742

Background and Purpose: Dose escalation in order to improve the biochemical control in prostate cancer requires the application of irradiation techniques with high conformality. The dosimetric selectivity ... [more ▼]

Background and Purpose: Dose escalation in order to improve the biochemical control in prostate cancer requires the application of irradiation techniques with high conformality. The dosimetric selectivity of three radiation modalities is compared: high-dose-rate brachytherapy (HDR-BT), intensity-modulated radiation radiotherapy (IMRT), and helical tomotherapy (HT). <br />Patients and Methods: Ten patients with prostate adenocarcinoma treated by a 10-Gy HDR-BT boost after external-beam radiotherapy were investigated. For each patient, HDR-BT, IMRT and HT theoretical treatment plans were realized using common contour sets. A 10-Gy dose was prescribed to the planning target volume (PTV). The PTVs and critical organs’ dose-volume histograms obtained were compared using Student’s t-test. <br />Results: HDR-BT delivers spontaneously higher mean doses to the PTV with smaller cold spots compared to IMRT and HT. 33% of the rectal volume received a mean HDR-BT dose of 3.86 ± 0.3 Gy in comparison with a mean IMRT dose of 6.57 ± 0.68 Gy and a mean HT dose of 5.58 ± 0.71 Gy (p < 0.0001). HDR-BT also enables to better spare the bladder. The hot spots inside the urethra are greater with HDR-BT. The volume of healthy tissue receiving 10% of the prescribed dose is reduced at least by a factor of 8 with HDR-BT (p < 0.0001). <br />Conclusion: HDR-BT offers better conformality in comparison with HT and IMRT and reduces the volume of healthy tissue receiving a low dose. [less ▲]

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See detailMultisegmented tangential breast fields: A rational way to treat breast cancer
GULYBAN, Akos ULg; Kovács, P.; Sebestyén, Z. et al

in Strahlentherapie und Onkologie (2008), 184(5), 262-269

Purpose: Using three-dimensional conformal radiation therapy (3D-CRT) and multisegmented conformal radiation therapy (MS-CRT) for breast cancer treatment, the dose coverage of the planning target volume ... [more ▼]

Purpose: Using three-dimensional conformal radiation therapy (3D-CRT) and multisegmented conformal radiation therapy (MS-CRT) for breast cancer treatment, the dose coverage of the planning target volume (PTV) and the radiation burden on the organs at risk (OARs) were evaluated. Material and Methods: 3D-CRT and MS-CRT were planned for 436 unilateral breasts (217 left). All patients were treated with MS-CRT between 2005 and 2007. For PTV delineation and beam orientation, supportive structures were applied. The mean PTV was 1,130 cm 3 (in ten patients > 2,200 cm3). Three-dimensional planning with weight-optimized medial and lateral open fields at a total dose of 50.4/1.8 Gy was followed by multisegmented planning with a reasonably high-dose-level dose cloud to define the medial subfield, and renewed optimization. This was repeated for the lateral subfield with a final optimization. For PTV coverage evaluation, the ICRU 50 was considered: the PTV portions receiving 95-107%, < 95% and > 107% of the prescribed dose (PTVD95- 107%, PTV<D95% and PTV>D107%), and the PTV maximal dose (PTVDmax). To compare the OAR radiation burdens, the mean doses to the ipsi-/contralateral lung, contralateral breast, and whole heart were documented. Results: The multisegmented plans furnished significantly (p < 0.0001) better target coverage (PTVD95-107% 82.8% vs. 90.9%, PTV<D95% 11.4% vs. 8.8%, PTV>D107% 5.9% vs. 0.3% and PTVDmax 56.6 vs. 54.3 Gy). The mean OAR doses remained almost unchanged: ipsilateral lung 10.5 versus 10.4 Gy, contralateral lung 0.4 versus 0.4 Gy, contralateral breast 0.8 versus 0.8 Gy, and whole heart (for left-sided cancers) 4.8 versus 4.8 Gy. The subfields required a mean of 9.8 MU (monitor units), i.e., a mean total 7.6 MU increment. The planning took 10-20 min, and the delivery 5-10 min. Conclusion: MS-CRT is a good alternative to breast intensity-modulated radiation therapy (IMRT) and seems adequate for right-sided cancers, whereas left-sided cancers necessitate a longer follow-up of heart-related side effects before a final assessment. © 2008 Urban & Vogel. [less ▲]

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See detailThermoplastic patient fixation: influence on chest wall and target motion during radiotherapy of lung cancer.
Cselik, Zolt; Horvath, Akos; Repa, Imre et al

in Strahlentherapie und Onkologie (2007), 183(5), 271-8

Several methods have been developed to reduce tumor motions and patient movements during radiotherapy of lung cancer. In this study, a multislice CT-based analysis was performed to examine the effect of a ... [more ▼]

Several methods have been developed to reduce tumor motions and patient movements during radiotherapy of lung cancer. In this study, a multislice CT-based analysis was performed to examine the effect of a thermoplastic patient immobilization system on the chest wall and tumor motions. Ten patients with stage II-IV lung cancer were enrolled into the study. According to tumor localization, five patients had peripheral, and five patients central lung cancer (T2-T4). In total, six series of measurements were made with a multislice CT scanner, both with and without mask fixation, in normal breathing, at maximal tidal volume inhalation, and at maximal tidal volume exhalation. Movements of chest wall, diaphragm and tumor, with and without mask, under different breathing conditions were registered. With the use of the immobilization system, no significant difference was found in diaphragmatic movements (mean deviation of diaphragm: 41.7-40.5 mm to the right, and 40.5-36.8 mm to the left side) and in tumor motions (mean deviation of tumor: 15.3-12.4 mm in craniocaudal, and 11.5-8.8 mm in posterolateral direction, mean medial deviation: 4.6-4.1 mm, mean lateral deviation: 7.2-5 mm). Significant differences were observed concerning tumor motions in anteroposterior direction (mean: 8.9-6.3 mm) and transverse chest movements in anteroposterior direction. Besides the advantage of optimal patient positioning, the movements of the bony chest wall can be considerably reduced by using the immobilization system. However, this fixation system has limitations concerning its suitability for minimizing tumor motions. [less ▲]

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See detailPSA kinetics after external beam radiotherapy alone or combined with an iridium brachytherapy boost to deliver 85 grays to prostatic adenocarcinoma.
Nickers, Philippe ULg; Coppens, Luc ULg; Beauduin, M. et al

in Strahlentherapie und Onkologie (2001), 177(2), 90-5

PURPOSE: Increasing the dose to prostatic adenocarcinoma in conformal external beam therapy (EBT) has resulted in increased levels of PSA normalization and increased percentage of biochemical disease-free ... [more ▼]

PURPOSE: Increasing the dose to prostatic adenocarcinoma in conformal external beam therapy (EBT) has resulted in increased levels of PSA normalization and increased percentage of biochemical disease-free survival rates. However technical problems due to prostate motion inside the pelvis or patients' set-up make difficult the realization of the EBT boost fields above 72 Gy. Brachytherapy which overcomes these problems was investigated to deliver the boost dose to achieve 85 Gy. PSA nadir which has been identified as the strongest independent predictor of any failure in many studies has been used as the end point for early evaluation of this work. PATIENTS AND METHODS: In a retrospective way we report on 163 patients' PSA kinetics after EBT alone to 68 Gy or EBT first and a brachytherapy boost up to 75 or 85 Gy. RESULTS: At 12 months follow-up, PSA nadirs percentage < or = 0.5 or < or = 1 ng/ml increased from 7.5 and 20.7% after 68 Gy EBT to 49.8 and 71.2% after a brachytherapy boost to deliver 85 Gy (p < 0.0001). In the Cox PH model analysis, the total dose remained the most important factor for predicting PSA normalization. CONCLUSIONS: These results are in accordance with the most recent results published after conformal EBT at the same 80 Gy level of dose. If confirmed on a higher number of patients they could place brachytherapy among the most accurate methods of boosting in the radiation treatment of prostatic carcinoma. [less ▲]

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See detailPathology and outcome after HART
COUCKE, Philippe ULg; Bouzourene, H

in Strahlentherapie und Onkologie (2000)

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See detailFMdC +/- Tirapazamine (SR4233) and irradiation
COUCKE, Philippe ULg; Cottin, E; Ciernik, I-F et al

in Strahlentherapie und Onkologie (2000)

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See detailCongrès SASRO 1999
COUCKE, Philippe ULg

in Strahlentherapie und Onkologie (1999, March)

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See detailPrimary cerebral lymphoma. A retrospective study of 27 cases
Grangier, C; COUCKE, Philippe ULg; Baur, A et al

in Strahlentherapie und Onkologie (1994), 170(4), 206-212

Primary cerebral lymphoma is a rare disease. The aim of this study is to compare the survival of the patients treated with radiotherapy alone vs. patients treated with a combined schedule of radio ... [more ▼]

Primary cerebral lymphoma is a rare disease. The aim of this study is to compare the survival of the patients treated with radiotherapy alone vs. patients treated with a combined schedule of radio-chemotherapy. Our results will be compared with currently published data and main prognostic factors will be briefly discussed. PATIENTS AND METHODS: Between 1974 and 1990, 27 cases of primary cerebral lymphoma were diagnosed at our institution. All patients had biopsy-proven disease, the pathology of which was reviewed for this study. RESULTS: The overall median survival time was 24 months and one-, two- and three-year overall survival was 59, 46 and 29% respectively. The median radiation dose was 46 Gy, ranging from 19.5 to 60 Gy. The median dose per fraction was 2 Gy (ranging from 1.61 to 3 Gy). The median elapsed treatment time was 32 days (ranging from three to 45 days). We were not able to demonstrate any statistically significant difference between patients who received radiotherapy alone (n = 14, median survival time = 24 months) and those who received a combination of chemotherapy and radiotherapy (n = 11, median survival time = 30 months), (p = 0.4). Prognostic factors of survival were tested using a univariate analysis (Wilcoxon test). Parameters such as mass appearance (unilobular, p = 0.048), performance status at the time of the diagnosis (0 to 1, p = 0.014), and CT imaging (hypodense, p = 0.043) influenced positively survival. Centroblastic histology (Kiel) was found associated with a negative prognosis (p = 0.043). CONCLUSION: In our experience, there is no statistically significant difference of survival between patients treated with radiotherapy alone or with a combined treatment of radio-chemotherapy. Other prognostic factors of survival were discovered, although the analysis was univariate, due to the limited number of patients. Multicentric prospective studies should be elaborated in order to optimize the treatment of this disease. [less ▲]

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See detailSmall bowel protection with "STEP". Silastic tissue expander prosthesis.
Coucke, Philippe ULg; Cuttat, J-F; Mirimanoff, R-O

in Strahlentherapie und Onkologie (1992), 168(4), 226229

Il s'agit d'un cas clinique d'un patient présentant un cancer du rectum et de la maladie de Crohn. Adjuvant treatment was considered to be mandatory on the basis of local extension. Traitement adjuvant a ... [more ▼]

Il s'agit d'un cas clinique d'un patient présentant un cancer du rectum et de la maladie de Crohn. Adjuvant treatment was considered to be mandatory on the basis of local extension. Traitement adjuvant a été considérée comme obligatoire sur la base de l'extension locale. Therefore a Silastic Tissue Expander Prosthesis (STEP), connected with a subcutaneously located self-sealing valve system, was introduced surgically to push small bowel up out of the treatment portals. Par conséquent, un Silastic Tissue Expander Prothèses (STEP), liée à un sous-cutanée située auto-obturant le système de valve, a été introduit chirurgicalement à pousser jusqu'à l'intestin grêle sur les portails de traitement. Patient received 55 Gy without any acute or late complication. Patient a reçu 55 Gy sans aucune complication aiguë ou tardive. This easy technique allows radiotherapy in conditions where complete elimination of small bowel outside the treatment volume is required. Cette technique simple permet de radiothérapie dans des conditions où l'élimination complète de l'intestin grêle en dehors du volume de traitement est nécessaire. [less ▲]

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