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    Blood flow and Vd (water): both biomarkers required for interpreting the effects of vascular targeting agents on tumor and normal tissue.

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    Authors
    Kötz, Barbara
    West, Catharine M L
    Saleem, Azeem
    Jones, Terry
    Price, Patricia M
    Affiliation
    Academic Department of Radiation Oncology, The University of Manchester, Manchester, UK.
    Issue Date
    2009-02
    
    Metadata
    Show full item record
    Abstract
    Positron emission tomography studies with oxygen-15-labeled water provide in vivo quantitative tissue perfusion variables-blood flow and fractional volume of distribution of water [V(d) (water)]. To investigate the relationship between perfusion variables and the effect of vascular-targeting agents on vasculature, we measured tissue perfusion in tumors, spleen, kidney, and liver before and after treatment with combretastatin-A4-phosphate, a combination of nicotinamide and carbogen (N/C), and interferon (IFN). We observed that mean tumor blood flow and V(d) (water) was lower than in kidney, liver, and spleen at baseline. Blood flow and V(d) (water) were related in tumor (r = 0.62; P = 0.004) at baseline, but not in other normal tissues evaluated, where minimal variations in V(d) (water) were observed over a wide range of blood flow. Despite the relationship between blood flow and V(d) (water) in tumors before intervention, vascular-targeting agent-induced changes in these perfusion variables were not correlated. In contrast, changes in blood flow and V(d) (water) correlated in kidney and spleen after N/C and in kidney after combretastatin-A4-phosphate. The close relation between blood flow and V(d) (water) in tumors but not normal tissue may reflect barriers to fluid exchange in tumors because of necrosis and/or increased interstitial fluid pressure and underlies the importance and interdependence of these positron emission tomography perfusion variables under these conditions. As blood flow and V(d) (water) signify different aspects of tissue perfusion, the differential effects of interventions on both variables, flow and V(d) (water), should therefore be reported in future studies.
    Citation
    Blood flow and Vd (water): both biomarkers required for interpreting the effects of vascular targeting agents on tumor and normal tissue. 2009, 8 (2):303-9 Mol. Cancer Ther.
    Journal
    Molecular Cancer Therapeutics
    URI
    http://hdl.handle.net/10541/69701
    DOI
    10.1158/1535-7163.MCT-08-1016
    PubMed ID
    19208824
    Type
    Article
    Language
    en
    ISSN
    1535-7163
    ae974a485f413a2113503eed53cd6c53
    10.1158/1535-7163.MCT-08-1016
    Scopus Count
    Collections
    All Christie Publications
    Academic Department of Radiation Oncology - ADRO

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