Evaluation of different normalization procedures for the calculation of the standardized uptake value in therapy response monitoring studies.
OBJECTIVE
The aim of this prospective study was to assess the influence of different normalization procedures on relative changes in standardized uptake values (SUV) of F-2-fluoro-2-deoxy-D-glucose positron emission tomography (FDG-PET) for the assessment of chemotherapy response in patients with colorectal carcinoma (CRC) and nonsmall cell lung carcinoma (NSCLC).


METHODS
In 97 patients with CRC (n = 48) and NSCLC (n = 49), FDG-PET was performed before and during the course of chemotherapy. Relative changes in SUV (DeltaSUV) were determined after correction for injected dose and bodyweight, lean body mass, body surface area or a combination of bodyweight and plasma glucose. The predictive value for overall and progression-free survival with respect to the different normalized DeltaSUVs was assessed.


RESULTS
In both CRC and NSCLC, no differences were seen in the degree of change between the four SUV-normalizations during chemotherapy. Cox regression analysis for overall survival showed significant hazard ratios of 1.14-1.16 per 10% SUV change in CRC and 1.10-1.13 in NSCLC and for progression-free survival hazard ratios of 1.15 per 10% DeltaSUV change in CRC and 1.10-1.12 in NSCLC.


CONCLUSIONS
Relative changes in SUV is a strong predictor for survival in both CRC and NSCLC. None of the four normalization methods showed statistical advantage over the other. Therefore, simplifying the methods for analysis of FDG-PET data can improve the incorporation of FDG-PET in clinical treatment-response monitoring and may facilitate application in multicentre trials.
Vriens
Dennis
D
Department of Nuclear Medicine, Biostatistics and Health Technology Assessment, Radboud University Nijmegen Medical Centre, Nijmegen, The Netherlands. D.Vriens@nucmed.umcn.nl
de Geus-Oei
Lioe-Fee
LF
van Laarhoven
Hanneke W
HW
Timmer-Bonte
Johanna N H
JN
Krabbe
Paul F M
PF
Visser
Eric P
EP
Oyen
Wim J G
WJ
D000328:Adult; D000368:Aged; D000704:Analysis of Variance; D002289:Carcinoma, Non-Small-Cell Lung / Q000000981:diagnostic imaging / Q000378:metabolism / Q000628:therapy; D015179:Colorectal Neoplasms / Q000000981:diagnostic imaging / Q000378:metabolism / Q000628:therapy; D005260:Female; D019788:Fluorodeoxyglucose F18 / Q000378:metabolism*; D006801:Humans; D008175:Lung Neoplasms / Q000000981:diagnostic imaging / Q000378:metabolism / Q000628:therapy; D008297:Male; D008875:Middle Aged; D049268:Positron-Emission Tomography / Q000379:methods*; D011446:Prospective Studies; D012044:Regression Analysis; D015996:Survival Rate; D016896:Treatment Outcome
D019788:Fluorodeoxyglucose F18