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A new strategy of CyberKnife treatment system based radiosurgery followed by early use of adjuvant bevacizumab treatment for brain metastasis with extensive cerebral edema

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Abstract

Bevacizumab blocks the effects of vascular endothelial growth factor in leakage-prone capillaries and has been suggested as a new treatment for cerebral radiation edema and necrosis. CyberKnife is a new, frameless stereotactic radiosurgery system. This work investigated the safety and efficacy of CyberKnife followed by early bevacizumab treatment for brain metastasis with extensive cerebral edema. The eligibility criteria of the patients selected for radiosurgery followed by early use of adjuvant bevacizumab treatment were: (1) brain tumors from metastasis with one solitary brain lesion and symptomatic extensive cerebral edema; (2) >18 years of age; (3) the patient refused surgery due to the physical conditions and the risk of surgery; (4) no contraindications for bevacizumab. (5) bevacizumab was applied for a minimum of 2 injections and a maximum of 6 injections with a 2-week interval between treatments, beginning within 2 weeks of the CyberKnife therapy; (6) Karnofsky performance status (KPS) ≥30. Tumor size and edema were monitored by magnetic resonance imaging (MRI). Dexamethasone dosage, KPS, adverse event occurrence and associated clinical outcomes were also recorded. Eight patients were accrued for this new treatment. Radiation dose ranged from 20 to 33 Gy in one to five sessions, prescribed to the 61–71 % isodose line. Bevacizumab therapy was administered 3–10 days after completion of CyberKnife treatment for a minimum of two cycles (5 mg/kg, at 2-week intervals). MRI revealed average reductions of 55.8 % (post-gadolinium) and 63.4 % (T2/FLAIR). Seven patients showed significant clinical neurological improvements. Dexamethasone was reduced in all patients, with five successfully discontinuing dexamethasone treatment 4 weeks after bevacizumab initiation. Hypertension, a bevacizumab-related adverse event, occurred in one patient. After 3–8 months, all patients studied were alive and primary brain metastases were under control, 2 developed new brain metastases and underwent salvage CyberKnife treatment. Recurrent edema and emerging radiation necrosis were not observed. CyberKnife radiosurgery followed by early use of bevacizumab is promising and appears safe for treatment of brain metastases with extensive cerebral edema.

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The authors declare that they have no conflicts of interest in the research.

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Authors and Affiliations

  1. Department of Radiation Oncology, Huashan Hospital, Fudan University, Shanghai, 200235, China

    Yang Wang, Jiazhong Dai, Xin Wang, Xiaoxia Liu, Guanghai Mei & Xiaofang Sheng

  2. Department of Neurosurgery, Huashan Hospital, Fudan University, Shanghai, 200235, China

    Enmin Wang, Li Pan & Nan Zhang

Authors
  1. Yang Wang
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  2. Enmin Wang
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  3. Li Pan
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  4. Jiazhong Dai
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  6. Xin Wang
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  7. Xiaoxia Liu
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  8. Guanghai Mei
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  9. Xiaofang Sheng
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Correspondence to Enmin Wang.

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Wang, Y., Wang, E., Pan, L. et al. A new strategy of CyberKnife treatment system based radiosurgery followed by early use of adjuvant bevacizumab treatment for brain metastasis with extensive cerebral edema. J Neurooncol 119, 369–376 (2014). https://doi.org/10.1007/s11060-014-1488-0

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  • DOI: https://doi.org/10.1007/s11060-014-1488-0

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