Abstract
OBJECTIVEAfter WHO 2016 Classification of Tumors of the Central Nervous System have published, molecular diagnosis became part of the diagnostic criteria. In this study, we investigated the correlation between PET images and molecular diagnosis of glioma.METHODSWe performed retrospective review of newly diagnosed supratentorial glioma patients who preoperatively underwent all four PET examinations (18F-FDG, 11C-MET, 18F-FLT and 18F-FMISO) from April 2009 to March 2019. The standardized uptake value (SUV) from the accumulation of each PET tracers, TNR (tumor to contralateral normal tissue ratio) of 18F-FDG,11C-MET and 18F-FLT, TBR (tumor to blood values ratio) of 18F-FMISO were measured. We investigated the correlation between these PET images and molecular diagnosis of glioma.RESULTSData from total of 79 patients which were 42 cases of IDH wild type glioblastoma, 2 cases of IDH mutated glioblastoma, 9 cases of IDH wild type astrocytoma, 13 cases of IDH mutated astrocytoma and 13 cases of IDH mutated and 1p/19q co-deleted oligodendroglioma were included in this study. Both TNR of 11C-MET(p<0.01) and 18F-FLT(p<0.01), and also TBR of 18F-FMISO(p<0.01) in IDH wild type gliomas showed significantly higher than IDH mutated gliomas. In WHO Gr2-3 gliomas, only TNR of 18F-FLT showed a significant difference between IDH wild type gliomas and IDH mutated gliomas(p<0.01). TNR of 18F-FLT(p<0.01) and TBR of 18F-FMISO(p<0.01) in 1p/19q co-deleted gliomas were significantly lower than gliomas without 1p/19q co-deletion, but there were no significant differences in WHO Gr2-3 gliomas. Among IDH mutated gliomas, TNR of 11C-MET in 1p/19q co-deleted gliomas showed significantly higher uptake than gliomas without 1p/19q co-deletion(p<0.05).CONCLUSIONPreoperative PET evaluation of each PET tracers may be useful for the molecular diagnosis of glioma.
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