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Erschienen in: European Radiology 8/2005

01.08.2005 | Gastrointestinal

Comparison of CT, MRI and FDG-PET in response prediction of patients with locally advanced rectal cancer after multimodal preoperative therapy: Is there a benefit in using functional imaging?

verfasst von: T. Denecke, B. Rau, K.-T. Hoffmann, B. Hildebrandt, J. Ruf, M. Gutberlet, M. Hünerbein, R. Felix, P. Wust, H. Amthauer

Erschienen in: European Radiology | Ausgabe 8/2005

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Abstract

The aim of this study was to compare CT, MRI and FDG-PET in the prediction of outcome of neoadjuvant radiochemotherapy in patients with locally advanced primary rectal cancer. A total of 23 patients with T3/4 rectal cancer underwent a preoperative radiochemotherapy combined with regional hyperthermia. Staging was performed using four-slice CT (n=23), 1.5-T MRI (n=10), and 18F-FDG-PET (n=23) before and 2–4 weeks after completion of neoadjuvant treatment. Response criteria were a change in T category and tumour volume for CT and MRI and a change in glucose uptake (standard uptake value) within the tumour for FDG-PET. Imaging results were compared with those of pretherapy endorectal ultrasound and histopathological findings. Histopathology showed a response to neoadjuvant therapy in 13 patients whereas 10 patients were classified as nonresponders. The mean SUV reduction in responders (60±14%) was significantly higher than in nonresponders (37±31%; P=0.030). The sensitivity and specificity of FDG-PET in identifying response was 100% (CT 54%, MRI 71%) and 60% (CT 80%, MRT 67%). Positive and negative predictive values were 77% (CT 78%, MRI 83%) and 100% (CT 57%, MRI 50%) (PET P=0.002, CT P=0.197, MRI P=0.500). These results suggest that FDG-PET is superior to CT and MRI in predicting response to preoperative multimodal treatment of locally advanced primary rectal cancer.
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Metadaten
Titel
Comparison of CT, MRI and FDG-PET in response prediction of patients with locally advanced rectal cancer after multimodal preoperative therapy: Is there a benefit in using functional imaging?
verfasst von
T. Denecke
B. Rau
K.-T. Hoffmann
B. Hildebrandt
J. Ruf
M. Gutberlet
M. Hünerbein
R. Felix
P. Wust
H. Amthauer
Publikationsdatum
01.08.2005
Erschienen in
European Radiology / Ausgabe 8/2005
Print ISSN: 0938-7994
Elektronische ISSN: 1432-1084
DOI
https://doi.org/10.1007/s00330-005-2658-4

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