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Experimental Therapeutics |
Istituto di Endocrinologia ed Oncologia Sperimentale del Consiglio Nazionale delle Ricerche, Dipartimento di Biologia e Patologia Cellulare e Molecolare "Luigi Califano" [F. Ca., D. V., T. G., G. V., A. F., M. S.] and Dipartimento di Endocrinologia e Oncologia Molecolare e Clinica [F. Ci., G. T.], University Federico II, 80131 Naples, Italy; Department of Oncology, Transplants and Advanced Technologies in Medicine, University of Pisa, 56100 Pisa, Italy [G. F.]; and Cancer Discovery, Astra Zeneca Mereside, Macclesfield, Cheshire, SK10 4TG, United Kingdom [A. J. R.]
RET/papillary thyroid carcinoma (PTC) oncogenes, generated by recombination of the tyrosine kinase-encoding domain of RET with different heterologous genes, are prevalent in papillary carcinomas of the thyroid. Point mutations of RET cause multiple endocrine neoplasia type 2 (MEN2) familial cancer syndrome and are found in sporadic medullary thyroid carcinomas. Here, we show that ZD6474, a low molecular weight tyrosine kinase inhibitor, blocks the enzymatic activity of RET-derived oncoproteins at a one-half maximal inhibitory concentration of 100 nM. ZD6474 blocked in vivo phosphorylation and signaling of the RET/PTC3 and RET/MEN2B oncoproteins and of an epidermal growth factor (EGF)-activated EGF-receptor/RET chimeric receptor. RET/PTC3-transformed cells-treated ZD6474 lost proliferative autonomy and showed morphological reversion. ZD6474 prevented the growth of two human PTC cell lines that carry spontaneous RET/PTC1 rearrangements. Finally, it blocked anchorage-independent growth of RET/PTC3-transformed NIH3T3 fibroblasts and the formation of tumors after injection of NIH-RET/PTC3 cells into nude mice. Thus, targeting RET oncogenes with ZD6474 might offer a potential treatment strategy for carcinomas sustaining oncogenic activation of RET.
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J A Fagin How thyroid tumors start and why it matters: kinase mutants as targets for solid cancer pharmacotherapy J. Endocrinol., November 1, 2004; 183(2): 249 - 256. [Abstract] [Full Text] [PDF] |
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J. A. Fagin Challenging Dogma in Thyroid Cancer Molecular Genetics--Role of RET/PTC and BRAF in Tumor Initiation J. Clin. Endocrinol. Metab., September 1, 2004; 89(9): 4264 - 4266. [Full Text] [PDF] |
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R. M. Melillo, A. M. Cirafici, V. De Falco, M. Bellantoni, G. Chiappetta, A. Fusco, F. Carlomagno, A. Picascia, D. Tramontano, G. Tallini, et al. The Oncogenic Activity of RET Point Mutants for Follicular Thyroid Cells May Account for the Occurrence of Papillary Thyroid Carcinoma in Patients Affected by Familial Medullary Thyroid Carcinoma Am. J. Pathol., August 1, 2004; 165(2): 511 - 521. [Abstract] [Full Text] [PDF] |
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S. A. Wells and J. R. Nevins Evolving Strategies for Targeted Cancer Therapy--Past, Present, and Future J Natl Cancer Inst, July 7, 2004; 96(13): 980 - 981. [Full Text] [PDF] |
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G. Cuccuru, C. Lanzi, G. Cassinelli, G. Pratesi, M. Tortoreto, G. Petrangolini, E. Seregni, A. Martinetti, D. Laccabue, C. Zanchi, et al. Cellular Effects and Antitumor Activity of RET Inhibitor RPI-1 on MEN2A-Associated Medullary Thyroid Carcinoma J Natl Cancer Inst, July 7, 2004; 96(13): 1006 - 1014. [Abstract] [Full Text] [PDF] |
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G. A. Kaltsas, G. M. Besser, and A. B. Grossman The Diagnosis and Medical Management of Advanced Neuroendocrine Tumors Endocr. Rev., June 1, 2004; 25(3): 458 - 511. [Abstract] [Full Text] [PDF] |
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D. Vitagliano, F. Carlomagno, M. L. Motti, G. Viglietto, Y. E. Nikiforov, M. N. Nikiforova, J. M. Hershman, A. J. Ryan, A. Fusco, R. M. Melillo, et al. Regulation of p27Kip1 Protein Levels Contributes to Mitogenic Effects of the RET/PTC Kinase in Thyroid Carcinoma Cells Cancer Res., June 1, 2004; 64(11): 3823 - 3829. [Abstract] [Full Text] [PDF] |
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C. J. Strock, J.-I. Park, M. Rosen, C. Dionne, B. Ruggeri, S. Jones-Bolin, S. R. Denmeade, D. W. Ball, and B. D. Nelkin CEP-701 and CEP-751 Inhibit Constitutively Activated RET Tyrosine Kinase Activity and Block Medullary Thyroid Carcinoma Cell Growth Cancer Res., September 1, 2003; 63(17): 5559 - 5563. [Abstract] [Full Text] [PDF] |
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