Positron emission tomography of experimental melanoma with [76Br]5-bromo-2-thiouracil
Identifieur interne : 001D18 ( Istex/Curation ); précédent : 001D17; suivant : 001D19Positron emission tomography of experimental melanoma with [76Br]5-bromo-2-thiouracil
Auteurs : Ulla M Rs [Suède] ; Vladimir Tolmachev [Suède] ; Anders Sundin [Suède]Source :
- Nuclear Medicine and Biology [ 0969-8051 ] ; 2000.
English descriptors
- KwdEn :
- Teeft :
- Acetic acid, Autoradiography, Bladder liver kidney muscle, Cancer patients, Clear delineation, Clinical immunology, Diagnostic modality, Diagnostic radiology, Elsevier science, High uptake, Human melanoma, Imaging, Larsson, Malignant melanoma, Melanin, Melanoma, Melanoma cells, Melanoma seeker, Melanoma tumors, Melanotic melanoma, Murine, Murine melanoma, Nascent melanin, Normal tissues, Nucl, Ocular melanoma, Other tissues, Overall concentration, Phosphate buffer, Pigment cell, Positron emission tomography, Preformed melanin, Present study, Previous autoradiographic studies, Radioactivity, Radioactivity concentrations, Relative concentration, Selective accumulation, Selective incorporation, Selective uptake, Sodium metabisulphite, Subcutaneous melanoma, Thiouracil, Tracer, Uppsala, Uppsala university.
Abstract
Abstract: Positron emission tomography (PET) has evolved as a new diagnostic modality in cancer patients. Thioureylenes, such as thiouracil and methimazole, are known to be incorporated into growing melanin and selectively retained in melanotic melanoma. In the present study we used [76Br]5-bromo-2-thiouracil as tracer for PET imaging of human and murine melanotic melanoma transplanted subcutaneously into rats. The melanomas were clearly depicted 1 day after the injection, when [76Br]5-bromo-2-thiouracil was retained in the tumors though the overall radioactivity concentration in the body had declined. Accumulation of 76Br was also seen in bladder, liver, and kidney. In addition, the rats were simultaneously injected with [125I]5-iodo-2-thiouracil and the tissue distribution of radioactivity was mapped by whole-body autoradiography. The results confirmed the selective uptake of thiouracil in the melanoma where the concentration of 125I-radioactivity was about three-fold higher than that in the liver and lungs. These results show the possibility of using [76Br]5-bromo-2-thiouracil for PET diagnostics of melanoma, including dosimetry, prior to targeted therapy using [131I]5-iodo-2-thiouracil or [211At]5-astato-2-thiouracil.
Url:
DOI: 10.1016/S0969-8051(00)00147-5
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<front><div type="abstract" xml:lang="en">Abstract: Positron emission tomography (PET) has evolved as a new diagnostic modality in cancer patients. Thioureylenes, such as thiouracil and methimazole, are known to be incorporated into growing melanin and selectively retained in melanotic melanoma. In the present study we used [76Br]5-bromo-2-thiouracil as tracer for PET imaging of human and murine melanotic melanoma transplanted subcutaneously into rats. The melanomas were clearly depicted 1 day after the injection, when [76Br]5-bromo-2-thiouracil was retained in the tumors though the overall radioactivity concentration in the body had declined. Accumulation of 76Br was also seen in bladder, liver, and kidney. In addition, the rats were simultaneously injected with [125I]5-iodo-2-thiouracil and the tissue distribution of radioactivity was mapped by whole-body autoradiography. The results confirmed the selective uptake of thiouracil in the melanoma where the concentration of 125I-radioactivity was about three-fold higher than that in the liver and lungs. These results show the possibility of using [76Br]5-bromo-2-thiouracil for PET diagnostics of melanoma, including dosimetry, prior to targeted therapy using [131I]5-iodo-2-thiouracil or [211At]5-astato-2-thiouracil.</div>
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