Abstract：
PURPOSE:Although [(18)F]FDG PET can measure therapy response sooner and more accurately than morphological imaging techniques, there is still some debate as to whether [(18)F]FDG uptake really reflects changes in the viable cell fraction. In this study changes in [(18)F]FDG uptake were investigated in a lymphoma model at several time-points after treatment and with different doses of chemotherapy. Data were analysed in terms of several parameters. METHODS:SCID mice were subcutaneously inoculated with 5x10(6) Daudi cells in the right thigh. One group was not treated (control group). The other groups received cyclophosphamide 75 mg/kg (low-dose group), 125 mg/kg (medium-dose group) and 175 mg/kg (high-dose group) on day 0. Sequential [(18)F]FDG small-animal PET (microPET) scans were performed on days 0, 2, 6, 9, 13 and 16 after treatment. The mean and maximum standardized uptake value (SUV(mean) and SUV(max)), metabolic tumour volume (Vol(metab)) and total lesion glycolysis (TLG) were calculated. RESULTS:A significant decrease in [(18)F]FDG uptake was observed on day 2 in the medium-dose and high-dose groups and on day 6 in the low-dose group, all preceding morphological changes. SUV(mean) and SUV(max) formed a plateau from day 6 to day 9, corresponding to the known influx of inflammatory cells. No obvious plateau was observed with TLG which was found to be the most sensitive parameter clearly differentiating the low-dose group from the medium- and high-dose groups early after therapy. CONCLUSION:[(18)F]FDG uptake was able to reflect the dose-response relationship for cyclophosphamide. TLG was the best parameter for dose-related response assessment in this tumour model.
journal_name
Eur J Nucl Med Mol Imagingauthors
Brepoels L,De Saint-Hubert M,Stroobants S,Verhoef G,Balzarini J,Mortelmans L,Mottaghy FMdoi
10.1007/s00259-010-1479-0subject
Has Abstractpub_date
2010-08-01 00:00:00pages
1688-95issue
9eissn
1619-7070issn
1619-7089journal_volume
37pub_type
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