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Optimising mitomycin C activity during intravesical instillation.

K Jauhiainen, L Kangas, A L Nieminen

    Urological Research
    |January 1, 1983
    PubMed
    Summary
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    Mitomycin C is effective for intravesical treatment when bladder pH is maintained above 6. Phosphate buffer at pH 7.4 ensures stability and efficacy, with prednisolone showing no impact on its antitumour activity.

    Area of Science:

    • Oncology
    • Pharmacology
    • Urology

    Background:

    • Walker 256 carcinosarcoma exhibits in vitro sensitivity to mitomycin C.
    • Intravesical mitomycin C is a treatment modality requiring optimization for clinical application.

    Purpose of the Study:

    • To determine optimal conditions for intravesical mitomycin C efficacy.
    • To provide practical recommendations for clinical intravesical mitomycin C use.

    Main Methods:

    • Evaluation of mitomycin C activity against Walker 256 carcinosarcoma under varying pH conditions.
    • Assessment of mitomycin C stability and activity in the presence of urine constituents and prednisolone.
    • Testing the efficacy of phosphate buffer (0.05 M, pH 7.4) for maintaining intravesical pH.

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    Main Results:

    • Mitomycin C rapidly loses antitumour activity below pH 6.
    • Mitomycin C remains stable and active at pH levels up to 10.
    • Phosphate buffer (0.05 M, pH 7.4) effectively maintains a suitable pH for intravesical treatment.
    • Urine constituents minimally affect buffered mitomycin C activity over 2 hours.
    • Prednisolone does not inhibit the antitumour activity of mitomycin C.

    Conclusions:

    • Intravesical mitomycin C treatment requires a buffered bladder environment with a pH above 6.
    • Phosphate buffer 0.05 M at pH 7.4 is recommended for intravesical mitomycin C therapy.
    • Prednisolone can be safely co-administered without compromising mitomycin C efficacy.