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An evaluation of 2-deoxy-2- [18F]fluoro-D-glucose and 3‟-Deoxy-3‟-[18F]-fluorothymidine uptake in human tumor xenograft models

Lookup NU author(s): Professor Steve Wedge

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Abstract

The aim of this study is to assess the variability of 2-deoxy-2-[18F]fluoro-d-glucose ([18F]-FDG) and 3′-deoxy-3′-[18F]-fluorothymidine ([18F]-FLT) uptake in pre-clinical tumor models and examine the relationship between imaging data and related histological biomarkers. Procedures: [18F]-FDG and [18F]-FLT studies were carried out in nine human tumor xenograft models in mice. A selection of the models underwent histological analysis for endpoints relevant to radiotracer uptake. Comparisons were made between in vitro uptake, in vivo imaging, and ex vivo histopathology data using quantitative and semi-quantitative analysis. Results: In vitro data revealed that [1-14C]-2-deoxy-d-glucose ([14C]-2DG) uptake in the tumor cell lines was variable. In vivo, [18F]-FDG and [18F]-FLT uptake was highly variable across tumor types and uptake of one tracer was not predictive for the other. [14C]-2DG uptake in vitro did not predict for [18F]-FDG uptake in vivo. [18F]-FDG SUV was inversely proportional to Ki67 and necrosis levels and positively correlated with HKI. [18F]-FLT uptake positively correlated with Ki67 and TK1. Conclusion: When evaluating imaging biomarkers in response to therapy, the choice of tumor model should take into account in vivo baseline radiotracer uptake, which can vary significantly between models.


Publication metadata

Author(s): Keen H, Pichler B, Kukuk D, Duchamp O, Raguin O, Shannon A, Whalley N, Jacobs V, Bales J, Gingles G, Ricketts S-A, Wedge SR

Publication type: Article

Journal: Molecular Imaging and Biology

Year: 2012

Volume: 14

Issue: 3

Pages: 355-365

Print publication date: 01/06/2012

ISSN (print): 1536-1632

ISSN (electronic): 1860-2002

Publisher: Springer

URL: http://dx.doi.org/10.1007/s11307-011-0504-4

DOI: 10.1007/s11307-011-0504-4


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