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Radiation sensitivity modification by chemotherapeutic agents

F W Hetzel, M Brown, N Kaufman

    Cancer Clinical Trials
    |January 1, 1981
    PubMed
    Summary
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    Three chemotherapy drugs were tested with radiation therapy. Mustargen and BCNU enhanced radiation

    Area of Science:

    • Radiation oncology
    • Cancer research
    • Pharmacology

    Background:

    • Chemotherapeutic agents are investigated for combined use with radiation therapy.
    • Understanding drug-radiation interactions is crucial for optimizing cancer treatment.
    • V79 cells and spheroids are standard models for radiobiology studies.

    Purpose of the Study:

    • To evaluate the in vitro effects of chlorambucil, mustargen, and BCNU on radiation survival curves.
    • To determine the impact of these agents on key radiobiological parameters such as D0 and n.
    • To assess the potential of these drugs as radiosensitizers in cancer therapy.

    Main Methods:

    • V79 cells and spheroids were exposed to 9-MeV electrons after pretreatment with varying concentrations of chlorambucil, mustargen, and BCNU.

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  • Radiation survival curves were generated and analyzed for changes in D0 (mean lethal dose) and n (initial slope/shoulder).
  • Enhancement ratios were calculated to quantify the sensitizing effect of the drugs.

    • Main Results:

    • Mustargen significantly reduced the D0 from 165 rads to 105 rads when administered prior to electron exposure.
    • BCNU dramatically reduced the shoulder region of survival curves, with n values approximately half those of controls.
    • Chlorambucil showed no effect on exponential or confluent cultures but demonstrated an enhancement ratio of 1.8 in intact spheroids.

    Conclusions:

    • Mustargen and BCNU exhibit significant radiosensitizing properties in vitro, altering critical parameters of radiation survival.
    • Chlorambucil's radiosensitizing effect is dependent on the cellular context, showing efficacy in intact spheroids.
    • These findings support further investigation into the clinical application of these chemotherapeutic agents in combination with radiation therapy.