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Poly(I,C)-LC as an interferon inducer in refractory multiple myeloma.

B G Durie, H B Levy, J Voakes

    Journal of Biological Response Modifiers
    |October 1, 1985
    PubMed
    Summary

    Poly(I,C)-LC showed potential in treating refractory multiple myeloma, with one partial response and three objective responses observed. The treatment induced interferon but also caused significant toxicities, including blood pressure changes and myelosuppression.

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    Area of Science:

    • Immunology
    • Oncology
    • Pharmacology

    Background:

    • Multiple myeloma is a hematologic malignancy characterized by uncontrolled plasma cell proliferation.
    • Refractory multiple myeloma presents a significant clinical challenge, necessitating novel therapeutic strategies.
    • Poly(I,C)-LC is an immunomodulatory agent with potential anti-cancer properties.

    Purpose of the Study:

    • To evaluate the efficacy and immunologic effects of poly(I,C)-LC in patients with refractory multiple myeloma.
    • To assess the safety and tolerability of poly(I,C)-LC in this patient population.

    Main Methods:

    • A Phase II clinical trial was conducted involving seven patients with refractory multiple myeloma.
    • Patients received intravenous poly(I,C)-LC three times per week.

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  • Serial immunologic assessments included natural killer (NK) cell activity, antibody-dependent cytotoxicity, delayed hypersensitivity, and in vitro mitogen responses.

    • Main Results:

    • One patient achieved a partial response (PR) lasting 6 months; three additional patients showed objective responses (less than PR).
    • Significant induction of interferon was observed, although levels decreased with repeated dosing.
    • Major toxicities included hypertension, hypotension, fever, and myelosuppression.

    Conclusions:

    • Poly(I,C)-LC demonstrated the ability to modulate myeloma progression in a refractory patient group.
    • The immunomodulatory effects and objective responses suggest potential therapeutic value, warranting further investigation despite observed toxicities.