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[Particle radiotherapy for malignant gliomas].

Tetsuya Yamamoto1, Koji Tsuboi

  • 1Graduate School of Comprehensive Human Science, University of Tsukuba, 1-1-1 Tennodai, Tsukuba, Ibaraki 305-8575, Japan.

Brain and Nerve = Shinkei Kenkyu No Shinpo
|July 22, 2009
PubMed
Summary

Particle radiotherapy, including proton/carbon and boron neutron capture therapy, shows promise for malignant gliomas. Clinical trials indicate improved survival rates for glioblastoma patients treated with these advanced radiation methods.

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Area of Science:

  • Oncology
  • Radiation Oncology
  • Medical Physics

Background:

  • Malignant gliomas are aggressive brain tumors with limited treatment options.
  • Particle radiotherapy, utilizing protons, carbon ions, or Boron Neutron Capture Therapy (BNCT), is an emerging therapeutic approach.
  • Previous studies suggest potential benefits, but definitive evidence for conformal particle radiation and tumor-selective BNCT is lacking.

Purpose of the Study:

  • To evaluate the clinical outcomes of particle radiotherapy for newly diagnosed glioblastomas.
  • To compare the efficacy of proton/carbon ion therapy with Boron Neutron Capture Therapy (BNCT).
  • To discuss the rationale, history, and clinical results of particle radiotherapy in glioblastoma treatment.

Main Methods:

  • A prospective clinical trial involving 20 newly diagnosed glioblastoma patients treated with particle radiotherapy (protons or carbon ions) at Tsukuba.

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  • A separate clinical trial involving 15 newly diagnosed glioblastoma patients treated with Boron Neutron Capture Therapy (BNCT) at Tsukuba.
  • Review and discussion of the historical context and scientific basis of particle radiotherapy for glioblastoma.

    • Main Results:

    • Particle radiotherapy (protons/carbon ions) in 20 patients resulted in a median overall survival of 21.6 months, with 1- and 2-year survival rates of 71.1% and 45.3%, respectively.
    • Boron Neutron Capture Therapy (BNCT) in 15 patients yielded a median overall survival of 25.7 months, with 1- and 2-year survival rates of 80.0% and 53.3%, respectively.
    • BNCT demonstrated slightly higher survival rates compared to proton/carbon ion therapy in this cohort.

    Conclusions:

    • Particle radiotherapy, including both conformal proton/carbon ion therapy and tumor-selective BNCT, shows promising survival outcomes for newly diagnosed glioblastomas.
    • BNCT appears to offer a survival advantage over proton/carbon ion therapy in the presented clinical trials.
    • Further research and larger trials are warranted to confirm these findings and optimize particle-based treatment strategies for malignant gliomas.