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The diagnostic role of F-18-FDG PET for primary central nervous system lymphoma

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Title: The diagnostic role of F-18-FDG PET for primary central nervous system lymphoma
Authors: Yamaguchi, Shigeru Browse this author
Hirata, Kenji Browse this author →KAKEN DB
Kobayashi, Hiroyuki Browse this author
Shiga, Tohru Browse this author →KAKEN DB
Manabe, Osamu Browse this author
Kobayashi, Kentaro Browse this author
Motegi, Hiroaki Browse this author
Terasaka, Shunsuke Browse this author →KAKEN DB
Houkin, Kiyohiro Browse this author →KAKEN DB
Keywords: Brain tumor
Corticosteroid
F-18-FDG PET
Primary central nervous system lymphoma
ROC curve
Issue Date: Aug-2014
Publisher: Springer
Journal Title: Annals of Nuclear Medicine
Volume: 28
Issue: 7
Start Page: 603
End Page: 609
Publisher DOI: 10.1007/s12149-014-0851-8
PMID: 24743915
Abstract: F-18-FDG PET has become one of the most important methods for studying malignant lymphoma, but its diagnostic role for primary central nervous system lymphoma (PCNSL) has not been established. The aim of this study was to determine the appropriate cut-off values of FDG uptake and to investigate how corticosteroid administration influences PCNSL. We retrospectively reviewed 82 patients with contrast-enhanced brain tumors who underwent an FDG PET scan at onset, including 19 PCNSLs. FDG uptake of the lesion was assessed by the maximum standardized uptake value (SUVmax) and the ratio of tumor to normal contralateral cortex activity (T/N ratio). Receiver operating characteristic (ROC) curves were generated from the SUVmax and T/N ratios. To investigate the influence of corticosteroid application before a FDG PET scan, we evaluated the association between the FDG uptake of the lesion and the cumulative dose of corticosteroid administration on 13 PCNSL patients who had received steroid treatment before an FDG PET examination. The mean FDG SUVmax and T/N ratio of PCNSLs were 22.6 and 2.79, respectively, and these values were significantly higher than those of the other malignant brain tumors. ROC analysis indicated that the evaluation of FDG uptake using the T/N ratio was more reliable than the SUVmax with respect to the differential diagnosis. When PCNSL patients went without steroid application before FDG PET, the accuracy of the T/N ratio with a cut-off point of 2.0 was 91.1 %, the sensitivity was 94.7 %, and the specificity was 87.3 %. Although there are no significant differences in the FDG T/N ratio for PCNSL patients with or without steroid treatment, a negative correlation was found between the T/N ratio and cumulative dose of corticosteroid before PET study (r = -0.71, p = 0.032). We concluded that the T/N ratio was superior to SUVmax for FDG uptake assessment as for distinguishing PCNSLs from other malignant brain tumors; the appropriate T/N ratio cut-off point was 2.0. In addition, FDG uptake could be influenced by cumulative doses of corticosteroid before a PET scan, and thus this fact should be taken into consideration when evaluating FDG PET for PCNSL diagnosis.
Rights: The final publication is available at link.springer.com
Type: article (author version)
URI: http://hdl.handle.net/2115/59751
Appears in Collections:医学院・医学研究院 (Graduate School of Medicine / Faculty of Medicine) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: 寺坂 俊介

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