Katsuya Mitamura1, Yuka Yamamoto2, Takashi Norikane1, Tetsuhiro Hatakeyama3, Masaki Okada3, Yoshihiro Nishiyama1. 1. Department of Radiology, Faculty of Medicine, Kagawa University, 1750-1 Ikenobe, Miki-cho, Kita-gun, Kagawa, 761-0793, Japan. 2. Department of Radiology, Faculty of Medicine, Kagawa University, 1750-1 Ikenobe, Miki-cho, Kita-gun, Kagawa, 761-0793, Japan. yuka@kms.ac.jp. 3. Department of Neurosurgery, Faculty of Medicine, Kagawa University, 1750-1 Ikenobe, Miki-cho, Kita-gun, Kagawa, 761-0793, Japan.
Abstract
OBJECTIVE: We evaluated the uptake of 2-deoxy-2-18F-fluoro-D-glucose (FDG) and L-[methyl-11C]-methionine (MET) in patients with newly diagnosed intracranial meningiomas and correlated the results with tumor proliferation. METHODS: Data from 22 patients with newly diagnosed intracranial meningioma (12 grade I and 10 grade II) who underwent both FDG and MET brain PET/CT studies were retrospectively analyzed. The PET images were evaluated by a qualitative method and semiquantitative analysis using standardized uptake value (SUV) (SUVmax and SUVpeak) and tumor-to-reference tissue ratio (Tmax/N ratio and Tpeak/N ratio). Proliferative activity as indicated by the Ki-67 index was estimated in tissue specimens. RESULTS: MET PET/CT showed a higher detection rate of meningioma than did FDG PET/CT (100 vs. 46%, respectively). The Tmax/N ratio and Tpeak/N ratio on MET PET/CT were significantly higher than those on FDG PET/CT (p < 0.001 and p < 0.001, respectively). There was a significant difference between grades I and II with respect to FDG SUVmax (p = 0.003), FDG SUVpeak (p = 0.003), FDG Tmax/N ratio (p = 0.02), FDG Tpeak/N ratio (p = 0.006), MET SUVmax (p = 0.002), MET SUVpeak (p = 0.002), MET Tmax/N ratio (p = 0.002), and MET Tpeak/N ratio (p = 0.002). There was a significant correlation between Ki-67 index and FDG PET/CT for SUVmax (p = 0.02), SUVpeak (p = 0.005), and Tpeak/N ratio (p = 0.05) and between Ki-67 index and MET PET/CT for SUVmax (p = 0.004), SUVpeak (p = 0.007), Tmax/N ratio (p = 0.002), and Tpeak/N ratio (p = 0.004). CONCLUSION: MET PET/CT showed a high sensitivity compared with FDG PET/CT for detection of newly diagnosed WHO grades I and II intracranial meningiomas. Both FDG and MET uptake were found to be useful for evaluating tumor proliferation in meningiomas.
OBJECTIVE: We evaluated the uptake of 2-deoxy-2-18F-fluoro-D-glucose (FDG) and L-[methyl-11C]-methionine (MET) in patients with newly diagnosed intracranial meningiomas and correlated the results with tumor proliferation. METHODS: Data from 22 patients with newly diagnosed intracranial meningioma (12 grade I and 10 grade II) who underwent both FDG and MET brain PET/CT studies were retrospectively analyzed. The PET images were evaluated by a qualitative method and semiquantitative analysis using standardized uptake value (SUV) (SUVmax and SUVpeak) and tumor-to-reference tissue ratio (Tmax/N ratio and Tpeak/N ratio). Proliferative activity as indicated by the Ki-67 index was estimated in tissue specimens. RESULTS: MET PET/CT showed a higher detection rate of meningioma than did FDG PET/CT (100 vs. 46%, respectively). The Tmax/N ratio and Tpeak/N ratio on MET PET/CT were significantly higher than those on FDG PET/CT (p < 0.001 and p < 0.001, respectively). There was a significant difference between grades I and II with respect to FDG SUVmax (p = 0.003), FDG SUVpeak (p = 0.003), FDG Tmax/N ratio (p = 0.02), FDG Tpeak/N ratio (p = 0.006), MET SUVmax (p = 0.002), MET SUVpeak (p = 0.002), MET Tmax/N ratio (p = 0.002), and MET Tpeak/N ratio (p = 0.002). There was a significant correlation between Ki-67 index and FDG PET/CT for SUVmax (p = 0.02), SUVpeak (p = 0.005), and Tpeak/N ratio (p = 0.05) and between Ki-67 index and MET PET/CT for SUVmax (p = 0.004), SUVpeak (p = 0.007), Tmax/N ratio (p = 0.002), and Tpeak/N ratio (p = 0.004). CONCLUSION: MET PET/CT showed a high sensitivity compared with FDG PET/CT for detection of newly diagnosed WHO grades I and II intracranial meningiomas. Both FDG and MET uptake were found to be useful for evaluating tumor proliferation in meningiomas.
Authors: K Mariam Slot; Dagmar Verbaan; Dennis R Buis; Linda J Schoonmade; Bart N M Berckel; W Peter Vandertop Journal: J Neuroimaging Date: 2020-11-02 Impact factor: 2.486
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