Masaaki Yamamoto

Summary

Country: Japan

Publications

  1. ncbi request reprint Stereotactic radiosurgery for patients with multiple brain metastases (JLGK0901): a multi-institutional prospective observational study
    Masaaki Yamamoto
    Katsuta Hospital Mito Gamma House, Hitachi naka, Japan Electronic address
    Lancet Oncol 15:387-95. 2014
  2. doi request reprint A case-matched study of stereotactic radiosurgery for patients with multiple brain metastases: comparing treatment results for 1-4 vs ≥ 5 tumors: clinical article
    Masaaki Yamamoto
    Katsuta Hospital Mito GammaHouse, Ibaraki, Japan
    J Neurosurg 118:1258-68. 2013
  3. doi request reprint Long-term side effects of radiosurgery for arteriovenous malformations
    Masaaki Yamamoto
    Katsuta Hospital Mito Gamma House, Ibaraki, Japan
    Prog Neurol Surg 27:97-106. 2013
  4. doi request reprint Validity of two recently-proposed prognostic grading indices for lung, gastro-intestinal, breast and renal cell cancer patients with radiosurgically-treated brain metastases
    Masaaki Yamamoto
    Katsuta Hospital Mito GammaHouse, 5125 2 Nakane, Hitachi naka, Ibaraki 312 0011, Japan
    J Neurooncol 111:327-35. 2013
  5. doi request reprint Long-term follow-up results of intentional 2-stage Gamma Knife surgery with an interval of at least 3 years for arteriovenous malformations larger than 10 cm³
    Masaaki Yamamoto
    Department of Neurosurgery, Katsuta Hospital Mito GammaHouse, Hitachinaka, Ibaraki, Japan
    J Neurosurg 117:126-34. 2012
  6. doi request reprint Delayed complications in patients surviving at least 3 years after stereotactic radiosurgery for brain metastases
    Masaaki Yamamoto
    Katsuta Hospital Mito GammaHouse, Hitachi naka, Ibaraki, Japan
    Int J Radiat Oncol Biol Phys 85:53-60. 2013
  7. doi request reprint Validity of three recently proposed prognostic grading indexes for breast cancer patients with radiosurgically treated brain metastases
    Masaaki Yamamoto
    Katsuta Hospital Mito GammaHouse, Hitachi naka, Japan
    Int J Radiat Oncol Biol Phys 84:1110-5. 2012
  8. doi request reprint Subclassification of recursive partitioning analysis Class II patients with brain metastases treated radiosurgically
    Masaaki Yamamoto
    Katsuta Hospital Mito GammaHouse, Hitachi naka, Japan
    Int J Radiat Oncol Biol Phys 83:1399-405. 2012
  9. doi request reprint How many metastases can be treated with radiosurgery?
    Masaaki Yamamoto
    Katsuta Hospital Mito Gamma House, Ibaraki, Japan
    Prog Neurol Surg 25:261-72. 2012
  10. doi request reprint Gamma Knife radiosurgery for hemangiomas of the cavernous sinus: a seven-institute study in Japan
    Masaaki Yamamoto
    Department of Neurosurgery, Katsuta Hospital Mito GammaHouse, Hitachi naka, Ibaraki, Japan
    J Neurosurg 112:772-9. 2010

Collaborators

Detail Information

Publications35

  1. ncbi request reprint Stereotactic radiosurgery for patients with multiple brain metastases (JLGK0901): a multi-institutional prospective observational study
    Masaaki Yamamoto
    Katsuta Hospital Mito Gamma House, Hitachi naka, Japan Electronic address
    Lancet Oncol 15:387-95. 2014
    ....
  2. doi request reprint A case-matched study of stereotactic radiosurgery for patients with multiple brain metastases: comparing treatment results for 1-4 vs ≥ 5 tumors: clinical article
    Masaaki Yamamoto
    Katsuta Hospital Mito GammaHouse, Ibaraki, Japan
    J Neurosurg 118:1258-68. 2013
    ..The authors' aim in the present study was to reappraise whether SRS results for ≥ 5 tumors differ from those for 1-4 tumors...
  3. doi request reprint Long-term side effects of radiosurgery for arteriovenous malformations
    Masaaki Yamamoto
    Katsuta Hospital Mito Gamma House, Ibaraki, Japan
    Prog Neurol Surg 27:97-106. 2013
    ..0 vs. 4.6%, χ2 p=0.0002). Although GKRS is undoubtedly an alternative to microsurgical resection for appropriately selected AVMs, we must weigh treatment results against complication risks which are not negligibly low...
  4. doi request reprint Validity of two recently-proposed prognostic grading indices for lung, gastro-intestinal, breast and renal cell cancer patients with radiosurgically-treated brain metastases
    Masaaki Yamamoto
    Katsuta Hospital Mito GammaHouse, 5125 2 Nakane, Hitachi naka, Ibaraki 312 0011, Japan
    J Neurooncol 111:327-35. 2013
    ..However, the Modified RPA system was shown to be applicable to patients with five primary cancer categories. This index should be considered when designing future clinical trials involving BM patients...
  5. doi request reprint Long-term follow-up results of intentional 2-stage Gamma Knife surgery with an interval of at least 3 years for arteriovenous malformations larger than 10 cm³
    Masaaki Yamamoto
    Department of Neurosurgery, Katsuta Hospital Mito GammaHouse, Hitachinaka, Ibaraki, Japan
    J Neurosurg 117:126-34. 2012
    ..The goal of this study was to increase knowledge in this area by reporting the authors' experience...
  6. doi request reprint Delayed complications in patients surviving at least 3 years after stereotactic radiosurgery for brain metastases
    Masaaki Yamamoto
    Katsuta Hospital Mito GammaHouse, Hitachi naka, Ibaraki, Japan
    Int J Radiat Oncol Biol Phys 85:53-60. 2013
    ..Little is known about delayed complications after stereotactic radiosurgery in long-surviving patients with brain metastases. We studied the actual incidence and predictors of delayed complications...
  7. doi request reprint Validity of three recently proposed prognostic grading indexes for breast cancer patients with radiosurgically treated brain metastases
    Masaaki Yamamoto
    Katsuta Hospital Mito GammaHouse, Hitachi naka, Japan
    Int J Radiat Oncol Biol Phys 84:1110-5. 2012
    ....
  8. doi request reprint Subclassification of recursive partitioning analysis Class II patients with brain metastases treated radiosurgically
    Masaaki Yamamoto
    Katsuta Hospital Mito GammaHouse, Hitachi naka, Japan
    Int J Radiat Oncol Biol Phys 83:1399-405. 2012
    ..This prompted us to divide RPA Class II patients into three subclasses...
  9. doi request reprint How many metastases can be treated with radiosurgery?
    Masaaki Yamamoto
    Katsuta Hospital Mito Gamma House, Ibaraki, Japan
    Prog Neurol Surg 25:261-72. 2012
    ..Although tumor number was demonstrated to have a significant impact on the duration of survival, approximately 85% of patients with brain metastasis died of causes other than brain disease progression, regardless of tumor number...
  10. doi request reprint Gamma Knife radiosurgery for hemangiomas of the cavernous sinus: a seven-institute study in Japan
    Masaaki Yamamoto
    Department of Neurosurgery, Katsuta Hospital Mito GammaHouse, Hitachi naka, Ibaraki, Japan
    J Neurosurg 112:772-9. 2010
    ..Gamma Knife radiosurgery (GKS) is currently used for primary or postoperative management of cavernous sinus (CS) hemangiomas. The authors describe their experience with 30 cases of CS hemangioma successfully managed with GKS...
  11. doi request reprint Gamma knife radiosurgery for brain metastases of non-lung cancer origin: focusing on multiple brain lesions
    Masaaki Yamamoto
    Katsuta Hospital Mito GammaHouse, Hitachi naka, Ibaraki, Japan
    Prog Neurol Surg 22:154-69. 2009
    ..Although tumor number was demonstrated to have a significant impact on the duration of survival, approximately 85% of patients with brain metastases died of causes other than brain disease progression, regardless of tumor number...
  12. ncbi request reprint Radiosurgery for metastatic brain tumors
    Masaaki Yamamoto
    Katsuta Hospital Mito GammaHouse, Hitachi naka, Ibaraki, Japan
    Prog Neurol Surg 20:106-28. 2007
    ..We advocate meticulous MRI follow-up to detect recurrence and assess tumor necrosis. All detectable tumors should be irradiated, so long as the patient wishes to continue treatment...
  13. ncbi request reprint Gamma Knife radiosurgery for numerous brain metastases: is this a safe treatment?
    Masaaki Yamamoto
    Katsuta Hospital Mito GammaHouse, Hitachi naka, Japan
    Int J Radiat Oncol Biol Phys 53:1279-83. 2002
    ..However, cumulative irradiation doses to the whole brain (WB), with such treatment, have not been determined...
  14. doi request reprint Accumulation of CD133-positive glioma cells after high-dose irradiation by Gamma Knife surgery plus external beam radiation
    Kaoru Tamura
    Department of Neurosurgery, Medical and Dental University, Tokyo, Japan
    J Neurosurg 113:310-8. 2010
    ..To investigate this hypothesis, the authors examined recurrent malignant gliomas for histopathological changes after high-dose irradiation with Gamma Knife surgery (GKS) and external beam radiation therapy (EBRT)...
  15. ncbi request reprint Gamma Knife surgery as sole treatment for multiple brain metastases: 2-center retrospective review of 1508 cases meeting the inclusion criteria of the JLGK0901 multi-institutional prospective study
    Toru Serizawa
    Tokyo Gamma Unit Center, Tsukiji Neurological Clinic, Tokyo, Japan
    J Neurosurg 113:48-52. 2010
    ..They also discuss the anticipated results of the JLGK0901 study...
  16. doi request reprint Gamma Knife surgery for metastatic brain tumors
    Toru Serizawa
    Tokyo Gamma Unit Center, Tsukiji Neurological Clinical, Tokyo, Japan
    J Neurosurg 109:118-21. 2008
    ..The authors compared results of Gamma Knife surgery (GKS) for brain metastases obtained at 2 institutions in Japan...
  17. doi request reprint Treatment of brain metastasis from lung cancer
    Takuya Kawabe
    Katsuta Hospital, Mito Gamma House, Hitachi naka, Japan
    Prog Neurol Surg 25:148-55. 2012
    ..Recently, SRS for brain metastasis from SCLC has been tried, but requires further verification...
  18. doi request reprint Gamma Knife surgery for patients with brainstem metastases
    Takuya Kawabe
    Katsuta Hospital Mito GammaHouse, Hitachi naka, Ibaraki, Japan
    J Neurosurg 117:23-30. 2012
    ..The authors describe their treatment results, focusing particularly on how long patients can survive without neurological deterioration following SRS for brainstem metastases...
  19. ncbi request reprint Decreased expression of heparanase in glioblastoma multiforme
    Yushi Ueno
    Department of Neurosurgery, Fukuoka University School of Medicine, Fukuoka, Japan
    J Neurosurg 102:513-21. 2005
    ....
  20. ncbi request reprint Delayed radiation necrosis with extensive brain edema after gamma knife radiosurgery for multiple cerebral cavernous malformations--case report
    Nobuo Takenaka
    Department of Neurosurgery, Kawasaki Municipal Hospital, Kawasaki, Kanagawa, Japan
    Neurol Med Chir (Tokyo) 43:391-5. 2003
    ..Delayed radiation necrosis associated with potentially fatal brain edema may occur after GKRS for cavernous malformations. Internal decompression and subsequent HBO therapy were very effective for the treatment of these lesions...
  21. ncbi request reprint Efficacy and feasibility of procarbazine, ranimustine and vincristine chemotherapy, and the role of surgical resection in anaplastic oligodendroglioma
    Masaaki Yamamoto
    Department of Neurosurgery, Fukuoka University School of Medicine, Fukuoka 814 0180, Japan
    Anticancer Res 25:3715-23. 2005
    ..The safety, tolerance and preliminary efficacy of a chemotherapy regimen consisting of procarbazine (PCB), ranimustine (MCNU) and vincristine (VCR) were assessed for patients with newly diagnosed supratentorial anaplastic oligodendroglioma...
  22. ncbi request reprint Delayed cyst formation after gamma knife radiosurgery for brain metastases
    Eiichi Ishikawa
    Department of Neurosurgery, Institute of Clinical Medicine, Graduate School of Comprehensive Human Sciences, University of Tsukuba, Tsukuba, Japan
    Neurosurgery 65:689-94; discussion 694-5. 2009
    ..Conversely, we recently experienced patients with delayed cyst formation (DCF) several years after GKRS, a complication not previously reported. Herein we assessed the frequency and characteristics of DCF after GKRS for METs...
  23. ncbi request reprint Malignant transformation eight years after removal of a benign epidermoid cyst: a case report
    Kaoru Tamura
    Department of Neurosurgery, Graduate School, Tokyo Medical and Dental University, Bunkyo ku, Tokyo, Japan
    J Neurooncol 79:67-72. 2006
    ..Gamma knife radiosurgery may be useful for short-term control of intracranial squamous cell carcinomas, but long-term effects are presently unknown...
  24. ncbi request reprint Sonodynamic therapy consisting of focused ultrasound and a photosensitizer causes a selective antitumor effect in a rat intracranial glioma model
    Masani Nonaka
    Department of Neurosurgery, Fukuoka University School of Medicine, Jonan ku, Fukuoka 814 0180, Japan
    Anticancer Res 29:943-50. 2009
    ..In this study we sought to determine the optimal focused ultrasound acoustic conditions with photosensitizers for the ablation of experimental intracranial glioma in rats...
  25. ncbi request reprint Rapid regrowth of intracranial clear cell meningioma after craniotomy and gamma knife radiosurgery--case report
    Mitsunobu Ide
    Department of Neurosurgery, Tokyo Women s Medical University, Daini Hospital, Tokyo, Japan
    Neurol Med Chir (Tokyo) 44:321-5. 2004
    ..This suggests that a marginal dose of 16 Gy may not be sufficient for control of CCM...
  26. pmc Clinical Course and Autopsy Findings of a Patient with Clival Chordoma Who Underwent Multiple Surgeries and Radiation during a 10-Year Period
    Masashi Tamaki
    Department of Neurosurgery, Graduate School, Tokyo Medical and Dental University, Yushima, Bunkyo ku, Tokyo, Japan
    Skull Base 17:331-40. 2007
    ..Therefore, the optimal treatment strategy is to remove the tumor mass as extensively as possible, including normal bony structures and connective tissues surrounding the tumor, using skull base surgical techniques...
  27. ncbi request reprint Recombinant mutant human tumor necrosis factor-alpha (TNF-SAM2) immunotherapy with ranimustine chemotherapy and concurrent radiation therapy for malignant astrocytomas
    Takeo Fukushima
    Department of Neurosurgery, Fukuoka University School of Medicine, 45 1, 7 chome, Nanakuma, Jonan ku, Fukuoka 814 0180, Japan
    Anticancer Res 23:4473-81. 2003
    ....
  28. ncbi request reprint Rapid shrinkage of remnant central neurocytoma after gamma knife radiosurgery: a case report
    Mutsuya Hara
    Department of Neurosurgery, School of Medicine, Tokyo Medical and Dental University, Yushima, Bunkyo ku, Tokyo, Japan
    J Neurooncol 62:269-73. 2003
    ..Gamma knife radiosurgery may be an option for effective treatment of patients with residual or recurrent central neurocytomas...
  29. ncbi request reprint [Two case mimicking cerebral tuberculoma in MRI diffusion weighted-images with difficult preoperative diagnosis]
    Wataru Nisikawa
    Department of Neurosurgery, Fukuoka University School of Medicine, Fukuoka City, Japan
    No To Shinkei 58:695-700. 2006
    ..In such cases mimicking intracerbral tuberculoma based on DWI, anti-tuberculous drugs are first treatment of choice, however, a biopsy should be performed as early as possible if the medication dose not show a significant response...
  30. ncbi request reprint The role of proteolysis in tumor invasiveness in glioblastoma and metastatic brain tumors
    Masaaki Yamamoto
    Department of Neurosurgery, Fukuoka University School of Medicine, 45 1, 7 chome, Nanakuma, Jonan ku, Fukuoka 814 0180, Japan
    Anticancer Res 22:4265-8. 2002
    ..An understanding of the mechanisms of increased expression of these molecules in glioblastoma might provide an insight into the regulatory pathway of cellular invasion and for a new therapeutic strategy for glioblastoma...
  31. ncbi request reprint Early palliation of oculomotor nerve palsy following gamma knife radiosurgery for pituitary adenoma
    Takumi Abe
    Department of Neurosurgery, Showa University School of Medicine, Tokyo, Japan
    Eur Neurol 47:61-3. 2002
  32. ncbi request reprint Long-term results after fractionated radiation therapy for large brain arteriovenous malformations
    Bengt Karlsson
    Department of Neurosurgery, West Virginia University, Morgantown, West Virginia 26506, USA
    Neurosurgery 57:42-9; discussion 42-9. 2005
    ..To study the results after fractionated radiotherapy of large arteriovenous malformations (AVMs)...
  33. ncbi request reprint [Letter about case of metastatic brain tumor with postoperative bleeding from the tumor following radiosurgery]
    Masaaki Yamamoto
    No Shinkei Geka 32:304; author reply 305. 2004
  34. ncbi request reprint Evaluation of the treatment of non-small cell lung cancer with brain metastasis and the role of risk score as a survival predictor
    Akinori Iwasaki
    Second Department of Surgery, School of Medicine, Fukuoka University, 45 1, 7 chome Nanakuma, Jonan ku, Fukuoka 814 0180, Japan
    Eur J Cardiothorac Surg 26:488-93. 2004
    ..However, a small group of these patients demonstrate a better prognosis. The objective of this study is to clarify the efficacy of treatment and evaluate factors affecting long-term patient survival...
  35. ncbi request reprint Is repeated radiosurgery an alternative to staged radiosurgery for very large brain arteriovenous malformations?
    Bengt Karlsson
    Department of Neurosurgery, West Virginia University, Morgantown, West Virginia 26506, USA
    J Neurosurg 107:740-4. 2007
    ..The results of a novel radiosurgical approach to treat large arteriovenous malformations (AVMs) with repeated radiosurgery are presented and discussed...