Heidelberg Institute of Radiation Oncology

Heidelberg, Germany

Heidelberg Institute of Radiation Oncology

Heidelberg, Germany
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Tanadini-Lang S.,University of Zürich | Rieber J.,University of Heidelberg | Rieber J.,Heidelberg Institute of Radiation Oncology | Filippi A.R.,University of Turin | And 31 more authors.
Radiotherapy and Oncology | Year: 2017

Background: Radical local treatment of pulmonary metastases is practiced with increasing frequency due to acknowledgment and better understanding of oligo-metastatic disease. This study aimed to develop a nomogram predicting overall survival (OS) after stereotactic body radiotherapy (SBRT) for pulmonary metastases. Patients and methods: A multi-institutional database of 670 patients treated with SBRT for pulmonary metastases was used as training cohort. Cox regression analysis with bidirectional variable elimination was performed to identify factors to be included into the nomogram model to predict 2-year OS. The calibration rate of the nomogram was assessed by plotting the actual Kaplan-Meier 2-year OS against the nomogram predicted survival. The nomogram was externally validated using two separate monocentric databases of 145 and 92 patients treated with SBRT for pulmonary metastases. Results: The median follow up of the trainings cohort was 14.3. months, the 2-year and 5-year OS was 52.6% and 23.7%, respectively. Karnofsky performance index, type of the primary tumor, control of the primary tumor, maximum diameter of the largest treated metastasis and number of metastases (1 versus >1) were significant prognostic factors in the Cox model (all p <. 0.05). The calculated concordance-index for the nomogram was 0.73 (concordance indexes of all prognostic factors between 0.54 and 0.6). Based on the nomogram the training cohort was divided into 4 groups and 2-year OS ranged between 24.2% and 76.1% (predicted OS between 30.2% and 78.4%). The nomogram discriminated between risk groups in the two validation cohorts (concordance index 0.68 and 0.67). Conclusions: A nomogram for prediction of OS after SBRT for pulmonary metastases was generated and externally validated. This tool might be helpful for interdisciplinary discussion and evaluation of local and systemic treatment options in the oligo-metastatic setting. Key message: A nomogram for prediction of overall survival after stereotactic body radiotherapy (SBRT) for pulmonary metastases was developed and externally validated. This tool might be helpful for interdisciplinary discussion and evaluation of local and systemic treatment options in the oligo-metastatic setting. © 2017 Elsevier B.V.

Petersen J.,University of Heidelberg | Petersen J.,German Cancer Research Center | Bendszus M.,University of Heidelberg | Debus J.,University of Heidelberg | And 5 more authors.
Progress in Biomedical Optics and Imaging - Proceedings of SPIE | Year: 2017

With the recent success of machine learning based solutions for automatic image parsing, the availability of reference image annotations for algorithm training is one of the major bottlenecks in medical image segmentation. We are interested in interactive semantic segmentation methods that can be used in an online fashion to generate expert segmentations. These can be used to train automated segmentation techniques or, from an application perspective, for quick and accurate tumor progression monitoring. Using simulated user interactions in a MRI glioblastoma segmentation task, we show that if the user possesses knowledge of the correct segmentation it is significantly (p ≤ 0.009) better to present data and current segmentation to the user in such a manner that they can easily identify falsely classified regions compared to guiding the user to regions where the classifier exhibits high uncertainty, resulting in differences of mean Dice scores between +0.070 (Whole tumor) and +0.136 (Tumor Core) after 20 iterations. The annotation process should cover all classes equally, which results in a significant (p ≤ 0.002) improvement compared to completely random annotations anywhere in falsely classified regions for small tumor regions such as the necrotic tumor core (mean Dice +0.151 after 20 it.) and non-enhancing abnormalities (mean Dice +0.069 after 20 it.). These findings provide important insights for the development of efficient interactive segmentation systems and user interfaces. © 2017 SPIE.

Rieber J.,University of Heidelberg | Rieber J.,Heidelberg Institute of Radiation Oncology | Deeg A.,University of Heidelberg | Deeg A.,Heidelberg Institute of Radiation Oncology | And 18 more authors.
Lung Cancer | Year: 2016

Purpose: Current guidelines recommend postoperative radiation therapy (PORT) for incompletely resected non-small cell lung cancer (NSCLC). However, there is still a paucity of evidence for this approach. Hence, we analyzed survival in 78 patients following radiotherapy for incompletely resected NSCLC (R1) and investigated prognostic factors. Patients and methods: All 78 patients with incompletely resected NSCLC (R1) received PORT between December 2001 and September 2014. The median total dose for PORT was 60. Gy (range 44-68. Gy). The majority of patients had locally advanced tumor stages (stage IIA (2.6%), stage IIB (19.2%), stage IIIA (57.7%) and stage IIIB (20.5%)). 21 patients (25%) received postoperative chemotherapy. Results: Median follow-up after radiotherapy was 17.7 months. Three-year overall (OS), progression-free (PFS), local (LPFS) and distant progression-free survival (DPFS) rates were 34.1, 29.1, 44.9 and 51.9%, respectively. OS was significantly prolonged at lower nodal status (pN0/1) and following dose-escalated PORT with total radiation doses >54. Gy (p = 0.012, p = 0.013). Furthermore, radiation doses >54. Gy significantly improved PFS, LPFS and DPFS (p = 0.005; p = 0.050, p = 0.022). Interestingly, survival was neither significantly influenced by R1 localization nor by extent (localized vs. diffuse). Multivariate analyses revealed lower nodal status and radiation doses >54.0. Gy as the only independent prognostic factors for OS (p = 0.021, p = 0.036). Conclusion: For incompletely resected NSCLC, PORT is used for improving local tumor control. Local progression is still the major pattern of failure. Radiation doses >54 Gy seem to support improved local control and were associated with better OS in this retrospective study. © 2015.

Rieber J.,University of Heidelberg | Rieber J.,Heidelberg Institute of Radiation Oncology | Streblow J.,University of Heidelberg | Streblow J.,Heidelberg Institute of Radiation Oncology | And 28 more authors.
Lung Cancer | Year: 2016

Objectives: The current literature on stereotactic body radiotherapy (SBRT) for oligometastatic disease is characterized by small patient cohorts with heterogeneous primary tumors, metastases location and dose regimes. Hence, this study established a multi-institutional database of 700 patients treated with SBRT for pulmonary metastases to identify prognostic factors influencing survival and local control. Materials and methods: All German radiotherapy departments were contacted and invited to participate in this analysis. A total number of 700 patients with medically inoperable lung metastases treated with SBRT in 20 centers between 1997 and 2014 were included in a database. Primary and metastatic tumor characteristics, treatment characteristics and follow-up data including survival, local control, distant metastases, and toxicity were evaluated. Lung metastases were treated with median PTV-encompassing single doses of 12.5 Gy (range 3.0-33.0 Gy) in a median number of 3 fractions (range 1-13). Results: After a median follow-up time of 14.3 months, 2-year local control (LC) and overall survival (OS) were 81.2% and 54.4%, respectively. In multivariate analysis, OS was most significantly influenced by pretreatment performance status, maximum metastasis diameter, primary tumor histology, time interval between primary tumor diagnosis and SBRT treatment and number of metastases. For LC, independent prognostic factors were pretreatment performance status, biological effective dose (BED) at PTV isocenter (BEDISO) and single fraction (PTV-encompassing) dose in multivariate analysis. Radiation-induced pneumonitis grade 2 or higher was observed in 6.5% of patients. The only factor significantly influencing toxicity was BEDISO (p = 0.006). Conclusion: SBRT for medically inoperable patients with pulmonary metastases achieved excellent local control and promising overall survival. Important prognostic factors were identified for selecting patients who might benefit most from this therapy approach. © 2016 Elsevier Ireland Ltd.

Rieber J.,University of Heidelberg | Rieber J.,Heidelberg Institute of Radiation Oncology | Tonndorf-Martini E.,University of Heidelberg | Tonndorf-Martini E.,Heidelberg Institute of Radiation Oncology | And 16 more authors.
Strahlentherapie und Onkologie | Year: 2016

Background: Radiosurgical treatment of brain metastases is well established in daily clinical routine. Utilization of flattening-filter-free beams (FFF) may allow for more rapid delivery of treatment doses and improve clinical comfort. Hence, we compared plan quality and efficiency of radiosurgery in FFF mode to FF techniques. Materials and methods: Between November 2014 and June 2015, 21 consecutive patients with 25 brain metastases were treated with stereotactic radiosurgery (SRS) in FFF mode. Brain metastases received dose-fractionation schedules of 1 × 20 Gy or 1 × 18 Gy, delivered to the conformally enclosing 80 % isodose. Three patients with critically localized or large (>3 cm) brain metastases were treated with 6 × 5 Gy. Plan quality and efficiency were evaluated by analyzing conformity, dose gradients, dose to healthy brain tissue, treatment delivery time, and number of monitor units. FFF plans were compared to those using the FF method, and early clinical outcome and toxicity were assessed. Results: FFF mode resulted in significant reductions in beam-on time (p < 0.001) and mean brain dose (p = 0.001) relative to FF-mode comparison plans. Furthermore, significant improvements in dose gradients and sharper dose falloffs were found for SRS in FFF mode (−1.1 %, −29.6 %; p ≤ 0.003), but conformity was slightly superior in SRS in FF mode (−1.3 %; p = 0.001). With a median follow-up time of 5.1 months, 6‑month overall survival was 63.3 %. Local control was observed in 24 of 25 brain metastases (96 %). Conclusion: SRS in FFF mode is time efficient and provides similar plan quality with the opportunity of slightly reduced dose exposure to healthy brain tissue when compared to SRS in FF mode. Clinical outcomes appear promising and show only modest treatment-related toxicity. © 2016 Springer-Verlag Berlin Heidelberg

Rief H.,University of Heidelberg | Katayama S.,University of Heidelberg | Bruckner T.,University of Heidelberg | Rieken S.,University of Heidelberg | And 8 more authors.
Trials | Year: 2015

Background: Stereotactic body radiation therapy (SBRT)using intensity-modulated radiotherapy (IMRT) can be a safe modality for treating spinal bone metastasis with enhanced targeting accuracy and an effective method for achieving good tumor control and a rigorous pain response. Methods/design: This is a single-center, prospective randomized controlled trial to evaluate pain relief after RT and consists of two treatment groups with 30 patients in each group. One group will receive single-fraction intensity-modulated RT with 1×24 Gy, and the other will receive fractionated RT with 10×3 Gy. The target parameters will be measured at baseline and at 3 and 6 months after RT. Discussion: The aim of this study is to evaluate pain relief after RT in patients with spinal bone metastases by means of two different techniques: stereotactic body radiation therapy and fractionated RT. The primary endpoint is pain relief at the 3-month time-point after RT. Secondly, quality of life, fatigue, overall and bone survival, and local control will be assessed. Trial registration: ClinicalTrials.gov identifier NCT02358720(June 2, 2015). © Rief et al.

Sterzing F.,University of Heidelberg | Sterzing F.,German Cancer Research Center | Sterzing F.,Heidelberg Institute of Radiation Oncology | Kratochwil C.,University of Heidelberg | And 13 more authors.
European Journal of Nuclear Medicine and Molecular Imaging | Year: 2016

Purpose: Radiotherapy is the main therapeutic approach besides surgery of localized prostate cancer. It relies on risk stratification and exact staging. This report analyses the potential of [68Ga]Glu-urea-Lys(Ahx)-HBED-CC (68Ga-PSMA-11), a new positron emission tomography (PET) tracer targeting prostate-specific membrane antigen (PSMA) for prostate cancer staging and individualized radiotherapy planning. Methods: A cohort of 57 patients with prostate cancer scanned with 68Ga-PSMA-11 PET/CT for radiotherapy planning was retrospectively reviewed; 15 patients were at initial diagnosis and 42 patients at time of biochemical recurrence. Staging results of conventional imaging, including bone scintigraphy, CT or MRI, were compared with 68Ga-PSMA ligand PET/CT results and the influence on radiotherapeutic management was quantified. Results: 68Ga-PSMA ligand PET/CT had a dramatic impact on radiotherapy application in the presented cohort. In 50.8 % of the cases therapy was changed. Conclusion: The presented imaging technique of 68Ga-PSMA PET/CT could be a key technology for individualized radiotherapy management in prostate cancer. © 2015, Springer-Verlag Berlin Heidelberg.

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