IMG-21. PROSPECTIVE PREOPERATIVE DETERMINATION OF ISOCITRATE DEHYDROGENASE MUTATION IN GLIOMAS USING SPECTRAL EDITING MAGNETIC RESONANCE SPECTROSCOPY

Autor:	Ioana D. Moldovan, Michael S. Taccone, Gerrard Jansen, Nader Zakhari, Diana Ghinda, Fahad Alkherayf, Carlos Torres, Thanh B. Nguyen, John Woulfe, Gerd Melkus, Ian Cameron
Rok vydání:	2020
Předmět:	Cancer Research Chemistry IMG computer.file_format Nuclear magnetic resonance spectroscopy Imaging Nuclear magnetic resonance Isocitrate dehydrogenase Oncology Mutation (genetic algorithm) AcademicSubjects/MED00300 AcademicSubjects/MED00310 Neurology (clinical) computer
Zdroj:	Neuro-Oncology
ISSN:	1523-5866 1522-8517
DOI:	10.1093/neuonc/noaa222.356
Popis:	BACKGROUND Gliomas are the most common malignant brain tumors in children and adults. A subset of these tumors harbour mutations in the enzyme isocitrate dehydrogenase (IDH) which produces the novel oncometabolite 2-hydroxyglutarate (2HG). In general, patients with an IDH mutant glioma have a longer survival—often necessitating more re-treatment sessions over the span of a patient’s life and surveillance monitoring for tumor recurrence. The need to non-invasively detect early evidence of tumor recurrence is therefore heightened in this unique subset of patients with extended survival. As magnetic resonance spectroscopy (MRS) has been demonstrated to measure biochemical components of intracranial tumors using MRI, we conducted a study in 58 pre-operative adult patients to determine if a diagnosis of IDH mutant glioma could be made confidently using imaging data. METHODS Patients underwent neuroimaging for diagnosis or preoperative planning on a 3 tesla MR scanner. A MEGA-PRESS spectral editing technique was employed. Imaging findings were directly compared to post-operative histopathologic diagnosis. RESUTLS: For all patients with gliomas from grade II to IV, detection of 2-HG with MEGA-PRESS sequence had a sensitivity between 48% and 81%, specificity between 60% and 100%, PPV between 53% and 100% and NPV between 77% and 85% depending on the CRLB threshold. Among the different metabolite ratios, a 2-HG/NAA ratio >0.034 had the highest sensitivity and specificity, 86% and 73% respectively. DISCUSSION Magnetic resonance spectroscopy (MRS) is an underused advanced MR technique that deserves consideration in pediatric neuro-oncology given its utility in non-invasively detecting malignant gliomas.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_dedup___::0acb0babf95507e79747d96293e26774 https://doi.org/10.1093/neuonc/noaa222.356 Zobrazit plný text záznamu