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90Y microsphere treatment of unresectable liver metastases: changes in 18F-FDG uptake and tumour size on PET/CT

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European Journal of Nuclear Medicine and Molecular Imaging Aims and scope Submit manuscript

Abstract

Purpose

The intra-arterial administration of 90Y microspheres is a new palliative treatment option for unresectable liver metastases. The aim of this study was to quantitatively assess changes in FDG uptake and tumour size following 90Y microsphere treatment (SIR-Spheres) using 18F-fluorodeoxyglucose (FDG) PET/CT imaging.

Methods

Five patients with unresectable liver metastases who had failed multiple prior chemotherapy regimens received seven 90Y microsphere treatments to a single liver lobe. All patients underwent a baseline PET/CT scan prior to treatment, as well as up to four follow-up PET/CT scans. The tumour area of 30 liver metastases was measured on CT and the FDG uptake was semiquantitatively assessed by calculation of standardised uptake values (SUVs). A total of 18 FDG-PET/CT scans were performed.

Results

The SUVs in the 30 treated liver metastases decreased from 6.5±2.3 at baseline to 4.2±1.8 after the first follow-up PET/CT scan (p=0.001). In contrast, the SUVs of untreated metastases increased slightly from 7.2±2.3 to 8.0±0.8. There was no difference in FDG uptake in treated versus untreated normal liver tissue. Using a previously defined threshold of 20% decrease in SUV from baseline to determine response, 20 out of 30 liver metastases were considered to have responded at the first follow-up PET/CT scan approximately 1 month after treatment. In these metastases, the SUV decreased by 47±12%, compared with a slight increase by 5.9±19% in ten non-responding metastases (p=0.0001). The changes in tumour size did not correlate with changes in FDG uptake. On the first follow-up PET/CT scan, the tumour area on CT increased by 3.1±57% in treated metastases compared with 23.3±32% in untreated metastases. A wide range of post-treatment changes of target lesions was observed on CT, including an increase in the size of hypodense lesions, necrotic features and complete resolution of CT abnormalities.

Conclusion

The metabolic information obtained from FDG-PET/CT seems to provide a more accurate and earlier assessment of therapy response following 90Y microsphere treatment than does the anatomical CT information.

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Author notes

  1. Maren Bienert

    Present address: Department of Nuclear Medicine, Charitè-University Medicine Berlin, Berlin, Germany

Authors and Affiliations

  1. Department of Radiology, University of Pittsburgh Medical Center (UPMC), 200 Lothrop Street, Pittsburgh, PA, 15213, USA

    Maren Bienert, Barry McCook, Mike Sheetz, Cecilia Tutor, Nikhil Amesur & Norbert Avril

  2. Department of Surgery, University of Pittsburgh Medical Center (UPMC), Pittsburgh, PA, 15213, USA

    Brian I. Carr & David A. Geller

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  1. Maren Bienert
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  2. Barry McCook
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Correspondence to Norbert Avril.

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Bienert, M., McCook, B., Carr, B.I. et al. 90Y microsphere treatment of unresectable liver metastases: changes in 18F-FDG uptake and tumour size on PET/CT. Eur J Nucl Med Mol Imaging 32, 778–787 (2005). https://doi.org/10.1007/s00259-004-1752-1

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  • DOI: https://doi.org/10.1007/s00259-004-1752-1

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