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Schaub C.,University of Bonn | Tichy J.,Senckenberg Institute | Schafer N.,University of Bonn | Franz K.,Goethe University Frankfurt | And 14 more authors.
Journal of Neuro-Oncology | Year: 2016

The value of bevacizumab (BEV) in recurrent glioblastoma is unclear. Imaging parameters and progression-free survival (PFS) are problematic endpoints. Few data exist on clinical factors influencing overall survival (OS) in unselected patients with recurrent glioblastoma exposed to BEV. We retrospectively analyzed 174 patients with recurrent glioblastoma treated with BEV at two German brain tumor centers. We evaluated general patient characteristics, MGMT status, pretreatment, concomitant oncologic treatment and overall survival. Karnofsky performance score, number of prior chemotherapies, number of prior recurrences and combined treatment with irinotecan (IRI) were significantly associated with OS in univariate analysis. We did not find differences in OS related to sex, age, histology, MGMT status, prior surgical treatment or number of prior radiotherapies. Combined treatment with IRI and higher KPS both remained significantly associated with prolonged survival in multivariate analysis, but patients receiving IRI co-treatment had less advanced disease. Grouping into clinically relevant categories revealed an OS of 16.9 months from start of BEV in patients with first recurrence and KPS ≥ 80 % (n = 25). In contrast, in patients with second recurrence and KPS < 80 %, OS was 3.6 months (n = 27). Our observational data support an early use of BEV in patients with good performance status. The benefit of co-treatment with IRI in our cohort seems to be the result of biased patient recruitment. © 2016 Springer Science+Business Media New York Source

Schafer N.,Medical Center Bonn | Schafer N.,University of Bonn | Gielen G.H.,Institute of Neuropathology | Kebir S.,Medical Center Bonn | And 18 more authors.
Journal of Cancer Research and Clinical Oncology | Year: 2016

Purpose: Dovitinib (TKI258) is an oral multi-tyrosine kinase inhibitor of FGFR, VEGFR, PDGFR β, and c-Kit. Since dovitinib is able to cross the blood–brain barrier and targets brain tumor-relevant pathways, we conducted a phase I trial to demonstrate its safety in recurrent glioblastoma (GBM). Patients and methods: Patients with first or second GBM recurrence started treatment with the maximal tolerated dose (MTD) previously established in systemic cancer patients (500 mg/d, 5 days on/2 days off). A modified 3 + 3 design in three cohorts (500, 400, 300 mg) was used. Results: Twelve patients were enrolled. Seventy-two adverse events (AEs) occurred and 16.7 % of AEs were classified as ≥CTC grade 3 toxicity, mainly including hepatotoxicity and hematotoxicity. Only one out of six patients of the 300-mg cohort showed grade 3 toxicity. The PFS-6 rate was 16.7 %, and it was not associated with detection of the FGFR-TACC gene fusion in the tumor. Conclusion: Dovitinib is safe in patients with recurrent GBM and showed efficacy in only some patients unselected for target expression. The recommended phase II dose of 300 mg would be substantially lower than the recently established MTD in systemic cancer patients. Further personalized trials are recommended. © 2016 Springer-Verlag Berlin Heidelberg Source

Kebir S.,University of Bonn | Gaertner F.C.,University of Bonn | Mueller M.,University of Bonn | Nelles M.,University of Bonn | And 12 more authors.
Oncology Letters | Year: 2016

Large demyelinating inflammatory central nervous system (CNS) lesions may present with contrast enhancement on magnetic resonance imaging and may mimic CNS tumors such as glioma. In ambiguous cases, new diagnostic tools that may be helpful for distinguishing between demyelinating inflammatory and neoplastic CNS lesions are required. The current study presents the case of a patient with a large contrast‑enhanced frontal brain lesion, who was initially diagnosed with tumefactive multiple sclerosis. Following the progression of the brain lesion, an18F‑fluoroethyl‑L‑tyrosine positron emission tomography (18F‑FET PET) was performed, revealing markedly elevated static18F‑FET uptake parameters along with time activity‑curves consistent with glioma. Subsequently, a biopsy was undertaken, which confirmed the presence of anaplastic oligoastrocytoma. This case illustrates that18F‑FET PET may provide useful diagnostic information in cases where distinction between neoplastic and demyelinating inflammatory CNS lesions is challenging. However, further systematic and prospective analyses are warranted to explore the value of this method in this setting. © 2016, Spandidos Publications. All rights reserved. Source

Schaub C.,University of Bonn | Schafer N.,University of Bonn | Mack F.,University of Bonn | Stuplich M.,University of Bonn | And 9 more authors.
Journal of Cancer Research and Clinical Oncology | Year: 2016

Purpose: The adequate second-line therapy of patients with glioblastoma (GBM) is a matter of ongoing debate. This particularly applies to patients with a non-methylated MGMT promotor who are known to have a poor response to alkylating chemotherapy. In some countries, antiangiogenic therapy with BEV is applied as second-line therapy, and in others nitrosourea therapy is second-line choice. It is an open question whether the delay of BEV to third-line therapy has a negative impact on survival. Methods: A total of 61 adult patients (median age 56.9 years) with MGMT-non-methylated relapsed GBM treated with BEV (n = 45) or nitrosourea (n = 16) as second-line therapy were analyzed retrospectively and compared regarding progression-free survival (PFS) and overall survival (OS). Results: Patients treated with second-line BEV had longer median PFS (107 days, 95 % CI 80.7–133.2 days) than patients with second-line nitrosourea (52 days, 95 % CI 36.3–67.7 days, P = 0.011, logrank test). However, there was no significant difference in overall survival (BEV median 170 days, 95 % CI 87.2–252.8 days; nitrosourea median 256 days, 95 % CI 159.9–352.0 days, P = 0.468). PFS was similar after BEV third-line therapy (median 117 days, 95 % CI 23.6–210.4 days) as compared to second-line BEV therapy (median 107 days, 95 % CI 80.7–133.3 days, P = 0.584). Conclusion: Our findings suggest that early treatment with BEV in patients with MGMT-non-methylated relapsed GBM is associated with a better PFS, but not with superior OS, possibly implicating that the early, i.e., second-line, use of BEV is not mandatory and BEV treatment may safely be delayed to third-line therapy in this subgroup of patients. © 2016 Springer-Verlag Berlin Heidelberg Source

Bostrom J.P.,University of Bonn | Seifert M.,University of Bonn | Greschus S.,University of Bonn | Schafer N.,University of Bonn | And 6 more authors.
Strahlentherapie und Onkologie | Year: 2014

Background and purpose. Recently two retrospective cohort studies report efficacy of bevacizumab in patients with recurrent atypical and anaplastic meningioma. Another successful therapeutic option of bevacizumab seems to be treatment of cerebral radiation necrosis. However, the antiangiogenic effects in MRI diffusion and perfusion in meningiomas have not been previously described in detail. The objective of this research was to evaluate the clinical and MR imaging effects of bevacizumab in a malignant meningioma patient harboring additional cerebral radiation necrosis. Case presentation. We report the case of an 80-year-old woman who underwent bevacizumab therapy (5 mg/kg every 2 weeks for 2 months) for treatment of a symptomatic radiation necrosis in malignant meningiomatosis of World Health Organization (WHO) grade III. The patient was closely monitored with MRI including diffusion and perfusion studies. Upon bevacizumab therapy, the clinical situation was well stabilized over a period of 4 months until the patient unfortunately died due to pneumonia/septicemia probably unrelated to bevacizumab therapy. Consecutive MRI demonstrated 4 important aspects: (1) considerable decrease of the contrast medium (CM)-enhanced radiation necrosis, (2) mixed response with respect to the meningiomatosis with stable and predominantly growing tumor lesions, (3) a new diffusion-weighted imaging (DWI) lesion in a CM-enhanced tumor as described in gliomas, which we did not interpret as a response to bevacizumab therapy, and (4) new thrombembolic infarcts, which are a known side-effect of bevacizumab treatment. Conclusion. Bevacizumab is effective in the treatment of radiation necrosis. We could not confirm the potential antitumor effect of bevacizumab in this patient. However, we could describe several new radiographic effects of bevacizumab therapy in malignant meningioma. © 2014 Springer-Verlag. Source

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