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Sensitization by SR-2508 plus Ro 03-8799.

H B Stone, Y H Luu, K N Lam

    International Journal of Radiation Oncology, Biology, Physics
    |July 1, 1986
    PubMed
    Summary

    Combining Ro 03-8799 and SR-2508 radiosensitizers at equitoxic doses reduced toxicity by 34%. However, if chronic toxicities overlap, combining these drugs offers minimal benefit over separate use.

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    Area of Science:

    • Radiation oncology
    • Pharmacology
    • Cancer research

    Background:

    • Ro 03-8799 exhibits central nervous system toxicity.
    • SR-2508 is associated with peripheral neuropathy.
    • Investigating combined use of radiosensitizers to mitigate toxicity.

    Purpose of the Study:

    • To assess the feasibility of reducing toxicity while maintaining radiosensitization by combining Ro 03-8799 and SR-2508.
    • To determine the therapeutic window for combined administration of these radiosensitizers.
    • To evaluate the potential for additive or synergistic effects in radiosensitization.

    Main Methods:

    • Determining the LD50/2 (median lethal dose) for intravenous administration of Ro 03-8799 and SR-2508 separately.
    • Administering both drugs together in equitoxic proportions to establish a combined LD50/2.
    • Evaluating radiosensitization using in vivo-in vitro assays with EMT6/SF tumors in BALB/c mice.

    Main Results:

    • The combined equitoxic dose (0.45 mg Ro 03-8799 + 2.9 mg SR-2508/gbw) represented 66% of the individual LD50/2 values, indicating a 34% reduction in toxicity.
    • Maximal radiosensitization was observed at drug doses between 10% and 60% of the LD50/2, comparable to misonidazole.
    • Lower doses resulted in reduced sensitization for both separate and combined drug administration.

    Conclusions:

    • Combined administration of Ro 03-8799 and SR-2508 can reduce acute toxicity.
    • The therapeutic benefit of combining these agents depends on the overlap of their chronic toxicities.
    • If chronic toxicities overlap significantly, the combination may offer little additional advantage over monotherapy.

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