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    [18F]-FLT positron emission tomography can be used to image the response of sensitive tumors to PI3-kinase inhibition with the novel agent GDC-0941.

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    Authors
    Cawthorne, C
    Burrows, N
    Gieling, R
    Morrow, Christopher J
    Forster, D
    Gregory, J
    Radigois, M
    Smigova, A
    Babur, M
    Simpson, Kathryn L
    Hodgkinson, Cassandra L
    Brown, G
    McMahon, A
    Dive, Caroline
    Hiscock, D
    Wilson, I
    Williams, K
    Show allShow less
    Affiliation
    Wolfson Molecular Imaging Centre, School of Cancer and Enabling Sciences, The University of Manchester, Manchester, United Kingdom. C.Cawthorne@hull.ac.uk
    Issue Date
    2013
    
    Metadata
    Show full item record
    Abstract
    The phosphoinositide 3-kinase (PI3K) pathway is deregulated in a range of cancers, and several targeted inhibitors are entering the clinic. This study aimed to investigate whether the positron emission tomography tracer 3'-deoxy-3'-[(18)F]fluorothymidine ([(18)F]-FLT) is suitable to mark the effect of the novel PI3K inhibitor GDC-0941, which has entered phase II clinical trial. CBA nude mice bearing U87 glioma and HCT116 colorectal xenografts were imaged at baseline with [(18)F]-FLT and at acute (18 hours) and chronic (186 hours) time points after twice-daily administration of GDC-0941 (50 mg/kg) or vehicle. Tumor uptake normalized to blood pool was calculated, and tissue was analyzed at sacrifice for PI3K pathway inhibition and thymidine kinase (TK1) expression. Uptake of [(18)F]-FLT was also assessed in tumors inducibly overexpressing a dominant-negative form of the PI3K p85 subunit p85α, as well as HCT116 liver metastases after GDC-0941 therapy. GDC-0941 treatment induced tumor stasis in U87 xenografts, whereas inhibition of HCT116 tumors was more variable. Tumor uptake of [(18)F]-FLT was significantly reduced following GDC-0941 dosing in responsive tumors at the acute time point and correlated with pharmacodynamic markers of PI3K signaling inhibition and significant reduction in TK1 expression in U87, but not HCT116, tumors. Reduction of PI3K signaling via expression of Δp85α significantly reduced tumor growth and [(18)F]-FLT uptake, as did treatment of HCT116 liver metastases with GDC-0941. These results indicate that [(18)F]-FLT is a strong candidate for the noninvasive measurement of GDC-0941 action.
    Citation
    [18F]-FLT positron emission tomography can be used to image the response of sensitive tumors to PI3-kinase inhibition with the novel agent GDC-0941 2013, 12 (5):819 Mol Cancer Ther
    Journal
    Molecular Cancer Therapeutics
    URI
    http://hdl.handle.net/10541/297407
    DOI
    10.1158/1535-7163.MCT-12-0905
    Additional Links
    http://mct.aacrjournals.org/cgi/doi/10.1158/1535-7163.MCT-12-0905
    Type
    Article
    Language
    en
    ISSN
    1535-7163
    1538-8514
    ae974a485f413a2113503eed53cd6c53
    10.1158/1535-7163.MCT-12-0905
    Scopus Count
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    All Paterson Institute for Cancer Research

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