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Title: 18F-FLT and 18F-FDG PET to measure response to radiotherapy combined with celecoxib in two colorectal xenograft models
Authors: Debucquoy, Annelies ×
Devos, Ellen
Vermaelen, Peter
Landuyt, Willy
De Weer, Stefanie
Van den Heuvel, Frank
Haustermans, Karin #
Issue Date: Sep-2009
Publisher: Taylor & Francis
Series Title: International Journal of Radiation Biology vol:85 issue:9 pages:763-771
Abstract: PURPOSE: To determine the dependence of celecoxib on the tumour micro-environment in vitro and in vivo and to compare the use of (18)F-Fluorodeoxyglucose ((18)F-FDG) and (18)F- 3'-deoxy-3-fluorothymidine ((18)F-FLT) to measure tumour response. MATERIALS AND METHODS: In vitro, colony assays were performed on a cyclo-oxygenase 2 (COX-2) negative (HCT116) and a COX-2 positive cell line (HCA7). Xenograft models of these cell lines were treated with celecoxib and/or radiotherapy. Micro Positron Emission Tomography (microPET) scans with (18)F-FDG and (18)F-FLT were performed at different time-points. RESULTS: In vitro, no radiosensitising effect was seen in either of the cell lines. In vivo results showed a significant effect of celecoxib in the COX-2 negative tumours (HCT116) (enhancement ratio 1.5, p = 0.02) while no significant effect was observed in the COX-2 positive model (HCA7). A good correlation between (18)F-FDG and (18)F-FLT uptake was seen in both tumour models (r = 0.48, p = 0.002; r = 0.41, p = 0.005). After irradiation, a decrease in the uptake of both tracers was observed in both tumour models, which was more pronounced in the combination group, confirming the growth delay data. CONCLUSIONS: The contradicting in vitro and in vivo results suggest a major role of the tumour micro-environment. (18)F-FLT seems a good alternative for (18)F-FDG to follow tumour growth after radiation treatment.
ISSN: 0955-3002
Publication status: published
KU Leuven publication type: IT
Appears in Collections:Laboratory of Experimental Radiotherapy
Nuclear Medicine & Molecular Imaging
× corresponding author
# (joint) last author

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