Measuring response to therapy using FDG PET: semi-quantitative and full kinetic analysisReport as inadecuate

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European Journal of Nuclear Medicine and Molecular Imaging

, Volume 38, Issue 5, pp 832–842

First Online: 06 January 2011Received: 27 September 2010Accepted: 02 December 2010


PurposeImaging with positron emission tomography PET using F-2-fluoro-2-deoxy-D-glucose FDG plays an increasingly important role for response assessment in oncology. Several methods for quantifying FDG PET results exist. The goal of this study was to analyse and compare various semi-quantitative measures for response assessment with full kinetic analysis, specifically in assessment of novel therapies.

MethodsBaseline and response dynamic FDG studies from two different longitudinal studies study A: seven subjects with lung cancer and study B: six subjects with gastrointestinal cancer with targeted therapies were reviewed. Quantification of tumour uptake included full kinetic methods, i.e. nonlinear regression NLR and Patlak analyses, and simplified measures such as the simplified kinetic method SKM and standardized uptake value SUV. An image-derived input function was used for NLR and Patlak analysis.

ResultsThere were 18 and 9 lesions defined for two response monitoring studies A and B. In all cases there was excellent correlation between Patlak- and NLR-derived response R > 0.96. Percentage changes seen with SUV were significantly different from those seen with Patlak for both studies p < 0.05. After correcting SUV for plasma glucose, SUV and Patlak responses became similar for study A, but large differences remained for study B. Further analysis revealed that differences in responses amongst methods in study B were primarily due to changes in the arterial input functions.

ConclusionUse of simplified methods for assessment of drug efficacy or treatment response may provide different results than those seen with full kinetic analysis.

KeywordsFDG PET SUV Patlak NLR Response monitoring  Download fulltext PDF

Author: Patsuree Cheebsumon - Linda M. Velasquez - Corneline J. Hoekstra - Wendy Hayes - Reina W. Kloet - Nikie J. Hoetjes - Egb


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