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Comparison of (18)F-FET and (18)F-FDG PET in brain tumors.

Abstract：

UNLABELLED:The purpose of this study was to compare the diagnostic value of positron emission tomography (PET) using [(18)F]-fluorodeoxyglucose ((18)F-FDG) and O-(2-[(18)F]fluoroethyl)-l-tyrosine ((18)F-FET) in patients with brain lesions suspicious of cerebral gliomas. METHODS:Fifty-two patients with suspicion of cerebral glioma were included in this study. From 30 to 50 min after injection of 180 MBq (18)F-FET, a first PET scan ((18)F-FET scan) was performed. Thereafter, 240 MBq (18)F-FDG was injected and a second PET scan was acquired from 30 to 60 min after the second injection ((18)F-FET/(18)F-FDG scan). The cerebral accumulation of (18)F-FDG was calculated by decay corrected subtraction of the (18)F-FET scan from the (18)F-FET/(18)F-FDG scan. Tracer uptake was evaluated by visual scoring and by lesion-to-background (L/B) ratios. The imaging results were compared with the histological results and prognosis. RESULTS:Histology revealed 24 low-grade gliomas (LGG) of World Health Organization (WHO) Grade II and 19 high-grade gliomas (HGG) of WHO Grade III or IV, as well as nine others, mainly benign histologies. The gliomas showed increased (18)F-FET uptake (>normal brain) in 86% and increased (18)F-FDG uptake (>white matter) in 35%. (18)F-FET PET provided diagnostically useful delineation of tumor extent while this was impractical with (18)F-FDG due to high tracer uptake in the gray matter. A local maximum in the tumor area for biopsy guidance could be identified with (18)F-FET in 76% and with (18)F-FDG in 28%. The L/B ratios showed significant differences between LGG and HGG for both tracers but considerable overlap so that reliable preoperative grading was not possible. A significant correlation of tracer uptake with overall survival was found with (18)F-FDG only. In some benign lesions like abscesses, increased uptake was observed for both tracers indicating a limited specificity of both techniques. CONCLUSIONS:(18)F-FET PET is superior to (18)F-FDG for biopsy guidance and treatment planning of cerebral gliomas. The uptake of (18)F-FDG is associated with prognosis, but the predictive value is limited and a histological evaluation of tumor tissue remains necessary. Therefore, amino acids like (18)F-FET are the preferred PET tracers for the clinical management of cerebral gliomas.

journal_name

Nucl Med Biol

journal_title

Nuclear medicine and biology

authors

Pauleit D,Stoffels G,Bachofner A,Floeth FW,Sabel M,Herzog H,Tellmann L,Jansen P,Reifenberger G,Hamacher K,Coenen HH,Langen KJ

doi

10.1016/j.nucmedbio.2009.05.005

subject

Has Abstract

pub_date

2009-10-01 00:00:00

pages

779-87

issue

7

eissn

0969-8051

issn

1872-9614

pii

S0969-8051(09)00130-9

journal_volume

36

pub_type

临床试验,杂志文章

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