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Pion radiotherapy at LAMPF.

S E Bush, A R Smith, S Zink

    International Journal of Radiation Oncology, Biology, Physics
    |December 1, 1982
    PubMed
    Summary

    Pi meson radiotherapy trials treated 230 patients with advanced cancers. Survival rates varied by cancer type, with prostate cancer showing 82% survival, but normal tissue reactions occurred at higher doses.

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    Area of Science:

    • Oncology
    • Medical Physics
    • Radiotherapy

    Background:

    • Clinical trials for pi meson radiotherapy were conducted between 1974 and 1982.
    • The Cancer Research and Treatment Center of the University of New Mexico and Los Alamos National Laboratory collaborated on these investigations.

    Purpose of the Study:

    • To evaluate the efficacy and toxicity of pi meson radiotherapy for various advanced neoplasms.
    • To assess patient survival outcomes and normal tissue tolerance.

    Main Methods:

    • A total of 230 patients with locally advanced primary and metastatic neoplasms were treated.
    • Follow-up data for a minimum of 18 months were collected for 196 patients.
    • Crude survival data and acute/severe chronic reactions were analyzed.

    Main Results:

    • Survival rates varied significantly by cancer type, ranging from 11% for unresectable pancreatic carcinoma to 82% for Stages C and D1 adenocarcinoma of the prostate.
    • Acute tolerance of normal tissues was observed at approximately 4500 pion rad in 36 fractions over 7 weeks.
    • Severe chronic reactions increased in frequency after doses exceeding 4000 pion rad.

    Conclusions:

    • Pi meson radiotherapy demonstrated variable efficacy depending on the specific cancer type.
    • Normal tissue tolerance is a critical factor, with increased severe chronic reactions noted at doses above 4000 pion rad.

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