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Proton therapy in Japan.

H Tsunemoto, S Morita, T Ishikawa

    Radiation Research. Supplement
    |January 1, 1985
    PubMed
    Summary
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    Proton beam therapy shows promise for tumor control in Japan, with high local control rates observed at NIRS and PARMS. However, radioresistant tumors and certain cancers like malignant melanoma require further investigation and advanced treatment strategies.

    Area of Science:

    • Radiation Oncology
    • Medical Physics
    • Clinical Proton Therapy

    Background:

    • Two leading Japanese facilities, NIRS and PARMS, are conducting clinical trials using proton beam therapy.
    • Proton therapy utilizes charged particles to deliver targeted radiation doses, minimizing damage to surrounding healthy tissues.

    Purpose of the Study:

    • To evaluate the efficacy and safety of proton beam therapy in clinical settings.
    • To compare local tumor control rates and complication incidence between proton therapy and conventional photon beam irradiation.

    Main Methods:

    • Analysis of patient data from NIRS (70 MeV proton beam) and PARMS (250 MeV proton beam) clinical trials.
    • Utilized a spot-beam-scanning system to precisely target tumors and spare normal tissues.
    • Recorded local tumor control, complication rates, and treatment outcomes for various cancer types.

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    Main Results:

    • NIRS: 9/11 patients (protons only) achieved local tumor control; 12/18 patients (photons/neutrons + proton boost) showed control with no complications.
    • PARMS: 14/22 patients achieved local tumor control; no severe complications reported.
    • Malignant melanoma and glioblastoma multiforme demonstrated limited response to proton beam therapy.

    Conclusions:

    • Proton beam therapy demonstrates potential for superior local tumor control compared to traditional photon beams.
    • Further research and combination therapies are necessary for managing radioresistant tumors and specific cancer types.
    • Proton therapy, particularly with advanced delivery systems, offers a promising approach in radiation oncology.