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Iodothiouracil as a melanoma localizing agent.

J A Coderre, S Packer, R G Fairchild

    Journal of Nuclear Medicine : Official Publication, Society of Nuclear Medicine
    |July 1, 1986
    PubMed
    Summary
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    Iodinated thiouracil derivatives show promise for melanoma diagnosis and therapy. These compounds selectively target melanoma tumors, accumulating in high levels while sparing normal tissues.

    Area of Science:

    • Oncology
    • Radiochemistry
    • Pharmacology

    Background:

    • Thiouracil derivatives are incorporated into melanin during melanoma biosynthesis.
    • Previous studies demonstrated the tumor persistence of sulfur-35 (35S) thiouracil.

    Purpose of the Study:

    • To evaluate iodinated thiouracil derivatives as melanoma-localizing agents.
    • To compare the biodistribution of [35S]thiouracil and iodothiouracil (labeled with 127I and 125I).

    Main Methods:

    • Utilized the transplantable Harding-Passey melanoma in BALB/c mice.
    • Administered radiolabeled thiouracil and iodothiouracil.
    • Performed whole-body autoradiography and tissue analysis for biodistribution studies.

    Main Results:

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    • [35S]thiouracil persisted in tumors for up to 2 weeks, with normal tissue levels returning to background.
    • [125I]thiouracil demonstrated selectivity for melanoma, localizing in primary tumors and secondary metastases.
    • Biodistribution of [35S]thiouracil and iodothiouracil was comparable.

    Conclusions:

    • Iodinated thiouracil derivatives effectively localize in melanotic melanomas.
    • These findings support the potential use of iodinated thiouracil derivatives for melanoma diagnosis and therapy.